bluuebunny/crossref_metadata_2025 huggingface dataset:
Stress-induced alterations in hippocampal plasticity, place cells, and spatial memory
Authors: Kim Jeansok J. , Lee Hongjoo J. , Welday Adam C. , Song EunYoung , Cho Jeiwon , Sharp Patricia E. , Jung Min W. , Blair Hugh T.
Published: November 2007

Acute, inescapable, and unpredictable stress can profoundly modify brain and cognition in humans and animals. The present study investigated the ensuing effects of 2-h variable “audiogenic” stress on three related levels of hippocampal functions in rats: long-term potentiation, place cell activity, and spatial memory. In agreement with prior findings, we observed that stress reduced the magnitude of Schaffer collateral/commissural–Cornu Ammonis field 1 long-term potentiation
in vitro
, and selectively impaired spatial memory on a hidden platform version of the Morris water maze task. We also observed that stress impaired the stability of firing rates (but not firing locations) of place cells recorded from dorsal Cornu Ammonis field 1 in rats foraging freely on a novel open-field platform located in a familiar surrounding room. These findings suggest that stress-induced modifications in synaptic plasticity may prevent the storage of stable “rate maps” by hippocampal place cells, which in turn may contribute to spatial memory impairments associated with stress.
DUX4
, a candidate gene of facioscapulohumeral muscular dystrophy, encodes a transcriptional activator of
PITX1
Authors: Dixit Manjusha , Ansseau Eugénie , Tassin Alexandra , Winokur Sara , Shi Rongye , Qian Hong , Sauvage Sébastien , Mattéotti Christel , van Acker Anne M. , Leo Oberdan , Figlewicz Denise , Barro Marietta , Laoudj-Chenivesse Dalila , Belayew Alexandra , Coppée Frédérique , Chen Yi-Wen
Published: November 2007

Facioscapulohumeral muscular dystrophy (FSHD) is an autosomal dominant disorder linked to contractions of the D4Z4 repeat array in the subtelomeric region of chromosome 4q. By comparing genome-wide gene expression data from muscle biopsies of patients with FSHD to those of 11 other neuromuscular disorders, paired-like homeodomain transcription factor 1 (
PITX1
) was found specifically up-regulated in patients with FSHD. In addition, we showed that the double homeobox 4 gene (
DUX4
) that maps within the D4Z4 repeat unit was up-regulated in patient myoblasts at both mRNA and protein level. We further showed that the DUX4 protein could activate transient expression of a luciferase reporter gene fused to the
Pitx1
promoter as well as the endogenous
Pitx1
gene in transfected C2C12 cells. In EMSAs, DUX4 specifically interacted with a 30-bp sequence 5′-CGGATGCTGTCTTCTAATTAGTTTGGACCC-3′ in the
Pitx1
promoter. Mutations of the TAAT core affected
Pitx1-LUC
activation in C2C12 cells and DUX4 binding
in vitro
. Our results suggest that up-regulation of both
DUX4
and
PITX1
in FSHD muscles may play critical roles in the molecular mechanisms of the disease.
HMGB1 release induced by liver ischemia involves Toll-like receptor 4–dependent reactive oxygen species production and calcium-mediated signaling
Authors: Tsung Allan , Klune John R. , Zhang Xianghong , Jeyabalan Geetha , Cao Zongxian , Peng Ximei , Stolz Donna B. , Geller David A. , Rosengart Matthew R. , Billiar Timothy R.
Published: November 2007

Ischemic tissues require mechanisms to alert the immune system of impending cell damage. The nuclear protein high-mobility group box 1 (HMGB1) can activate inflammatory pathways when released from ischemic cells. We elucidate the mechanism by which HMGB1, one of the key alarm molecules released during liver ischemia/reperfusion (I/R), is mobilized in response to hypoxia. HMGB1 release from cultured hepatocytes was found to be an active process regulated by reactive oxygen species (ROS). Optimal production of ROS and subsequent HMGB1 release by hypoxic hepatocytes required intact Toll-like receptor (TLR) 4 signaling. To elucidate the downstream signaling pathways involved in hypoxia-induced HMGB1 release from hepatocytes, we examined the role of calcium signaling in this process. HMGB1 release induced by oxidative stress was markedly reduced by inhibition of calcium/calmodulin-dependent kinases (CaMKs), a family of proteins involved in a wide range of calcium-linked signaling events. In addition, CaMK inhibition substantially decreased liver damage after I/R and resulted in accumulation of HMGB1 in the cytoplasm of hepatocytes. Collectively, these results demonstrate that hypoxia-induced HMGB1 release by hepatocytes is an active, regulated process that occurs through a mechanism promoted by TLR4-dependent ROS production and downstream CaMK-mediated signaling.
A novel M cell–specific carbohydrate-targeted mucosal vaccine effectively induces antigen-specific immune responses
Authors: Nochi Tomonori , Yuki Yoshikazu , Matsumura Akiko , Mejima Mio , Terahara Kazutaka , Kim Dong-Young , Fukuyama Satoshi , Iwatsuki-Horimoto Kiyoko , Kawaoka Yoshihiro , Kohda Tomoko , Kozaki Shunji , Igarashi Osamu , Kiyono Hiroshi
Published: November 2007

Mucosally ingested and inhaled antigens are taken up by membranous or microfold cells (M cells) in the follicle-associated epithelium of Peyer's patches or nasopharynx-associated lymphoid tissue. We established a novel M cell–specific monoclonal antibody (mAb NKM 16–2-4) as a carrier for M cell–targeted mucosal vaccine. mAb NKM 16–2-4 also reacted with the recently discovered villous M cells, but not with epithelial cells or goblet cells. Oral administration of tetanus toxoid (TT)– or botulinum toxoid (BT)–conjugated NKM 16–2-4, together with the mucosal adjuvant cholera toxin, induced high-level, antigen-specific serum immunoglobulin (Ig) G and mucosal IgA responses. In addition, an oral vaccine formulation of BT-conjugated NKM 16–2-4 induced protective immunity against lethal challenge with botulinum toxin. An epitope analysis of NKM 16–2-4 revealed specificity to an α(1,2)-fucose–containing carbohydrate moiety, and reactivity was enhanced under sialic acid–lacking conditions. This suggests that NKM 16–2-4 distinguishes α(1,2)-fucosylated M cells from goblet cells containing abundant sialic acids neighboring the α(1,2) fucose moiety and from non-α(1,2)-fucosylated epithelial cells. The use of NKM 16–2-4 to target vaccine antigens to the M cell–specific carbohydrate moiety is a new strategy for developing highly effective mucosal vaccines.
Dysregulated Epstein-Barr virus infection in the multiple sclerosis brain
Authors: Serafini Barbara , Rosicarelli Barbara , Franciotta Diego , Magliozzi Roberta , Reynolds Richard , Cinque Paola , Andreoni Laura , Trivedi Pankaj , Salvetti Marco , Faggioni Alberto , Aloisi Francesca
Published: November 2007

Epstein-Barr virus (EBV), a ubiquitous B-lymphotropic herpesvirus, has been associated with multiple sclerosis (MS), an inflammatory disease of the central nervous system (CNS), but direct proof of its involvement in the disease is still missing. To test the idea that MS might result from perturbed EBV infection in the CNS, we investigated expression of EBV markers in postmortem brain tissue from MS cases with different clinical courses. Contrary to previous studies, we found evidence of EBV infection in a substantial proportion of brain-infiltrating B cells and plasma cells in nearly 100% of the MS cases examined (21 of 22), but not in other inflammatory neurological diseases. Ectopic B cell follicles forming in the cerebral meninges of some cases with secondary progressive MS were identified as major sites of EBV persistence. Expression of viral latent proteins was regularly observed in MS brains, whereas viral reactivation appeared restricted to ectopic B cell follicles and acute lesions. Activation of CD8+ T cells with signs of cytotoxicity toward plasma cells was also noted at sites of major accumulations of EBV-infected cells. Whether homing of EBV-infected B cells to the CNS is a primary event in MS development or the consequence of a still unknown disease-related process, we interpret these findings as evidence that EBV persistence and reactivation in the CNS play an important role in MS immunopathology.
Jagged1-mediated Notch activation induces epithelial-to-mesenchymal transition through Slug-induced repression of E-cadherin
Authors: Leong Kevin G. , Niessen Kyle , Kulic Iva , Raouf Afshin , Eaves Connie , Pollet Ingrid , Karsan Aly
Published: November 2007

Aberrant expression of Jagged1 and Notch1 are associated with poor outcome in breast cancer. However, the reason that Jagged1 and/or Notch overexpression portends a poor prognosis is unknown. We identify Slug, a transcriptional repressor, as a novel Notch target and show that elevated levels of Slug correlate with increased expression of Jagged1 in various human cancers. Slug was essential for Notch-mediated repression of E-cadherin, which resulted in β-catenin activation and resistance to anoikis. Inhibition of ligand-induced Notch signaling in xenografted Slug-positive/E-cadherin–negative breast tumors promoted apoptosis and inhibited tumor growth and metastasis. This response was associated with down-regulated Slug expression, reexpression of E-cadherin, and suppression of active β-catenin. Our findings suggest that ligand-induced Notch activation, through the induction of Slug, promotes tumor growth and metastasis characterized by epithelial-to-mesenchymal transition and inhibition of anoikis.
Modelling vortex-induced fluid–structure interaction
Authors: Benaroya Haym , Gabbai Rene D
Published: November 2007

The principal goal of this research is developing physics-based, reduced-order, analytical models of nonlinear fluid–structure interactions associated with offshore structures. Our primary focus is to generalize the Hamilton's variational framework so that systems of flow-oscillator equations can be derived from first principles. This is an extension of earlier work that led to a single energy equation describing the fluid–structure interaction. It is demonstrated here that flow-oscillator models are a subclass of the general, physical-based framework. A flow-oscillator model is a reduced-order mechanical model, generally comprising two mechanical oscillators, one modelling the structural oscillation and the other a nonlinear oscillator representing the fluid behaviour coupled to the structural motion.

Reduced-order analytical model development continues to be carried out using a Hamilton's principle-based variational approach. This provides flexibility in the long run for generalizing the modelling paradigm to complex, three-dimensional problems with multiple degrees of freedom, although such extension is very difficult. As both experimental and analytical capabilities advance, the critical research path to developing and implementing fluid–structure interaction models entails

formulating generalized equations of motion, as a superset of the flow-oscillator models; and

developing experimentally derived, semi-analytical functions to describe key terms in the governing equations of motion.

The developed variational approach yields a system of governing equations. This will allow modelling of multiple d.f. systems. The extensions derived generalize the Hamilton's variational formulation for such problems. The Navier–Stokes equations are derived and coupled to the structural oscillator. This general model has been shown to be a superset of the flow-oscillator model. Based on different assumptions, one can derive a variety of flow-oscillator models.
Nonlinear resonant characteristics of shallow fluid layers
Authors: Kobine J. Jonathan
Published: November 2007

Results are presented from an experimental investigation of the motion of a shallow layer of water in a square tank that was oscillated horizontally with small amplitude at frequencies close to the natural frequency of the layer. The aim was to assess the validity of certain theoretical predictions relating to nonlinear resonance in shallow layers based on asymptotic analysis. These concern the hysteretic nature of the resonance profile and the existence of non-trivial oscillatory components associated with shock-like discontinuities in the derived solution for the free surface configuration. The experimental results support the theoretical predictions and show a coincidence in parameter space between the regions of hysteresis and oscillatory transition.
(2,2-Bipyridyl N,N′-dioxide-κ2
O,O′)trichloridobis(methanol-κO)terbium(III)
Authors: Liu Yin-Qiu , Zeng Xi-Rui , Lei Liang-Ping
Published: November 2007

In the title complex, [TbCl3(C10H12N2O2)(CH4O)2], each TbIII ion is seven-coordinate in a pentagonal-bipyramidal coordination geometry. A crystallographic twofold rotation axis passes through Tb and one Cl atom.
Aqua[3-carboxy-2-(3,5-dibromo-2-oxidobenzylamino-κ2
N,O)propanoato-κO
1](dimethylformamide-κO)copper(II) dimethylformamide solvate monohydrate
Authors: Jin Li-Xia , Zhang Shu-Hua , Liu Zheng , Li Guang-Zhao
Published: November 2007

In the title compound, [Cu(C11H7Br2NO5)(C3H7NO)(H2O)]·C3H7NO·H2O, the CuII atom is coordinated in a slightly distorted square-pyramidal geometry defined by two O atoms and one N atom from a 3-carboxy-2-(3,5-dibromo-2-oxidobenzylamino)propanoate ligand, one O atom from a dimethylformamide (DMF) molecule in the basal plane, and by one O atom from an aqua ligand in the apical position. In the crystal structure, the water molecules are linked by O—H...O hydrogen bonds into chains which resemble a pearl necklace. The molecules form a three-dimensional supramolecular network through O—H...O hydrogen bonds and C—H...Br hydrogen bonds.
1-Methyl-3-propyl-1H-pyrazole-5-carboxylic acid
Authors: Zhang Cunyan , Li Hui , Liu Dengke , Liu Mo
Published: November 2007

In the title compound, C8H12N2O2, an intermediate in the synthesis of sidenafil, the crystal packing is consolidated by O—H...N and C—H...O interactions.
3,3′-Diethyl-1,1′-(ethane-1,2-diyl)dibenzimidazolium dibromide dihydrate
Authors: Wu Xiu-Mei , Liu Qing-Xiang , Wang Xiu-Guang , Song Hai-Bin , Zheng Zhan-Ying
Published: November 2007

The title compound, C20H24N4
2+·2Br−·2H2O, was prepared from benzimidazole by stepwise alkylation with ethyl bromide followed by 1,2-bromoethane. The dication lies about a twofold rotation axis through the centre of the ethanyl group that links the two planar benzimidazolium residues. The asymmetric unit also contains a bromide anion and a solvent water molecule. The two benzimidazole ring systems are parallel.
trans-Dimethanolbis(1,1,1-trifluoro-5,5-dimethylhexane-2,4-dionato)cobalt(II)
Authors: Lerach Jordan O. , Zeller Matthias , Leskiw Brian D.
Published: November 2007

The Co atom of the title compound, [Co(C8H10F3O2)2(CH3OH)2], which is located on a crystallographic inversion center, exhibits a distorted octahedral geometry. The bidentate acetylacetonate-like ligands are in a trans arrangement. The plane through the acetylacetonate unit is tilted with respect to the CoO4 plane by 17.41 (7)°, which is in the same range as observed for similar Co(acac)2OR
2 derivatives. Via the methanol hydroxy groups, each molecule participates in two pairs of intermolecular hydrogen bonds that create a network of hydrogen-bonded chains along the direction of the a axis.
4-(4-Allyl-2-methoxyphenoxy)benzene-1,2-dicarbonitrile
Authors: Şahin Onur , Büyükgüngör Orhan , Şaşmaz Selami , Kantar Cihan
Published: November 2007

In the title compound, C18H14N2O2, the dihedral angle between the two benzene rings is 88.6 (1)°. The allyl group is disordered over two orientations, with refined occupancies of 0.695 (6) and 0.305 (6). The methoxy group is coplanar with the attached benzene ring. C—H...N intermolecular hydrogen bonds link the molecules into a C(6) chain along the a axis. The chain structure is further strengthened by C—H...π interactions.
1-{4-[(E)-2-(9H-Carbazol-9-yl)ethenyl]phenyl}ethan-1-one
Authors: Prukała Wiesław , Marciniec Bogdan , Kubicki Maciej
Published: November 2007

In the title molecule, C22H17NO, the two approximately planar carbazole and phenyl groups make a dihedral angle of 45.34 (5)°. In the crystal structure, C—H...O hydrogen-bonded dimers are connected by additional C—H...O and C—H...π interactions into chains along the [001] direction.
Carbamazepine trifluoroacetic acid solvate
Authors: Fernandes Philippe , Bardin Julie , Johnston Andrea , Florence Alastair J. , Leech Charlotte K. , David William I. F. , Shankland Kenneth
Published: November 2007

Carbamazepine forms a 1:1 solvate with trifluoroacetic acid (systematic name: 5H-dibenzo[b,f]azepine-5-carboxamide trifluoroacetic acid solvate), C15H12N2O·C2HF3O2. The compound crystallizes with one molecule of carbamazepine and one of trifluoroacetic acid in the asymmetric unit to form an R
2
2(8) motif. The solvent molecule is disordered over two sites, with site-occupancy factors 0.53 (1) and 0.47 (1).
1-(2-Nitrophenyl)-3-pivaloylthiourea
Authors: Saeed Aamer , Flörke Ulrich
Published: November 2007

In the structure of the title compound, C12H15N3O3S, the thioamide and amide groups are almost coplanar with the benzene ring. The planes of the NO2 group and the benzene ring form a dihedral angle of 40.8 (2)°. The crystal packing shows intermolecular N—H...S hydrogen bonds, forming centrosymmetric dimers which are stacked along [001].
Chain and ring motifs in bis(creatininium) sulfate
Authors: Bahadur S. Asath , Rajalakshmi M. , Athimoolam S. , Kannan R. Sayee , Ramakrishnan V.
Published: November 2007

The title compound, 2C4H8N3O+·SO4
2−, crystallizes with two creatininium cations and one sulfate anion in the asymmetric unit. Cations and anions dimerize through N—H...O hydrogen bonds forming R
2
2(8) ring motifs. Furthermore, these rings are connected via N—H...O hydrogen bonds, leading to C
2
2(6) and C
2
2(8) chain motifs. These interactions lead to a parallel set of hydrogen-bonded lamellar aggregations propagating along the c axis of the unit cell. Another cation is situated above these sheets, leading to a grid-like structure.
7-Nitro-2-phenyl-4H-3,1-benzoxazin-4-one
Authors: Khan Zulfiqar Ali , Khan Khalid M. , Anjum Shazia
Published: November 2007

The title compound, C14H8N2O4, was synthesized by reacting p-nitroanthranilic acid and benzoyl chloride at ambient temperature. The structure is stabilized by an intramolecular C—H...O hydrogen bond and an intermolecular C—H...O hydrogen bond. Additionally, weak π–π stacking interactions [centroid–centroid distance 3.6 (17) Å] between adjacent molecules further stabilize the crystal structure and form parallel layers along the b axis.
(NH4)[B3PO6(OH)3]·0.5H2O
Authors: Liu Wei , Zhao Jingtai
Published: November 2007

The title compound, ammonium catena-[monoboro-monodihydrogendiborate-monohydrogenphosphate] hemihydrate, was obtained under solvothermal conditions using glycol as the solvent. The crystal structure is constructed of one-dimensional infinite borophosphate chains, which are interconnected by ammonium ions and water molecules via a complex hydrogen-bond network to form a three-dimensional structure. The water molecules of crystallization are disordered over inversion centres, and their H atoms were not located.
Di-μ-chlorido-bis({2-[(triisopropylsilyl)aminomethyl]pyridine-κN}lithium(I))
Authors: Koch Christian , Görls Helmar , Westerhausen Matthias
Published: November 2007

The title compound, [Li2Cl2(C15H38N2Si)4], is a centrosymmetric dimer. Each Li atom is coordinated in a distorted tetrahedral manner by two pyridyl rings and two chloride anions. Only one of the two symmetry-independent NH groups is involved in hydrogen bonding.
[1,2-Bis(diphenylphosphino)ethane]diiodidoplatinum(II) dichloromethane disolvate
Authors: Sivaramakrishna Akella , Su Hong , Moss John R.
Published: November 2007

In the title compound, [PtI2(C26H24P2)]·2CH2Cl2, the PtI2(dppe) [dppe = 1,2-bis(diphenylphosphino)ethane] molecules possess twofold rotation symmetry. The Pt coordination displays a square-planar arrangement, with the sum of the angles around the Pt atom being 360.01 (2)°. The Pt—I distance is 2.6484 (5) Å. In the crystal structure, intermolecular C—H...I contacts link the PtI2(dppe) molecules into rows along the c axis, with a C...I distance of 3.873 (5) Å.
1-(4-Methoxybenzyl)pyridinium p-toluenesulfonate
Authors: Achilonu Matthew C. , Janse van Rensburg J. Marthinus , Westhuizen Jan H. van der , Roodt Andreas
Published: November 2007

In the title compound, C13H14NO+·C7H7O3S−, intermolecular C—H...O hydrogen bonds in the range 3.26–3.45 Å are observed. The p-toluenesulfonate anions stack in a tail-to-tail (i.e. methyl-to-methyl) fashion, with an interplanar toluene–toluene distance of 3.472 Å.
Poly[di-μ2-chlorido-μ4-hexamethylenetetramine-bis[chlorido(methanol-κO)cadmium(II)]]
Authors: Chen Yun , Wang Yu-Ling , Ying Shao-Ming , Cai Shuang-Lian
Published: November 2007

In the title complex, [Cd2Cl4(C6H12N4)(CH3OH)2]
n
, the hexamethylenetetramine (hmta) ligand is located on a twofold rotation axis and bridges four CdII ions through its four N atoms. Each CdII atom is coordinated, with a distorted octahedral geometry, by two N atoms from hmta ligands, two μ2-chloride anions, one terminal chloride anion and one methanol molecule. The μ2-chloride anions and hmta molecules link the CdII cations to form the three-dimensional polymeric structure. O—H...Cl hydrogen bonding between the methanol ligands and the terminal chloride anions is observed in the three-dimensional polymeric structure.
Bis(2,4-Dinitrophenyl)amine
Authors: Wu De-Lin , Jia Zhao-Li , Shi Jie-Ping , Lu Guo-Yuan
Published: November 2007

In the title compound, C12H7N5O8, the dihedral angle between the two benzene rings is 56.3 (2)°. The crystal packing is stabilized by intramolecular N—H...O and intermolecular C—H...O hydrogen bonds.
[μ-10,21-Difluoro-3,6,14,17-tetrazatricyclo[17.3.1.18,12]tetracosa-1(23),2,6,8,10,12(24),13,17,19,21-decaene-23,24-diolato-κ4
N
3,N
6,O
23,O
24:κ4
N
14,N
17,O
23,O
24]bis[methanolcopper(II)] bis(perchlorate)
Authors: Bai Jun-Lin , Zhou Hong , Pan Zhi-Quan , Meng Xiang-Gao
Published: November 2007

The title complex, [Cu2(C20H16F2N4O2)(CH4O)2](ClO4)2, was synthesized by cyclo-condensation between ethylenediamine and 2,6-diformyl-4-fluorophenol in the presence of CuII ions. This dinuclear copper complex is centrosymmetric. Both Cu atoms are in a distorted tetrahedral geometry, coordinated by three O atoms and two N atoms. The two Cu atoms are bridged by two endogenous phenol O atoms, with a Cu...Cu distance of 2.8998 (7) Å. In the crystal structure, the perchlorate ions link the macrocycles through inter- and intramolecular hydrogen bonds.
catena-Poly[[[aquaformato(1,10-phenanthroline)cobalt(II)]-μ-formato] monohydrate]
Authors: Zhou Bin , Zheng Peng-Wu , Liu Ke-Yue
Published: November 2007

In the polymeric title compound, {[Co(CHO2)2(C12H8N2)(H2O)]·H2O}
n
, the cobalt ion is coordinated by two N atoms from one chelating 1,10-phenanthroline ligand, three formate O atoms and one water O atom, giving a cis-CoN2O4 octahedral geometry. Pairs of formate anions bridge the metal atoms into a chain. A network of O—H...O hydrogen bonds helps to establish the packing.
Ethylenediammonium tetraaquabis(sulfato)cobaltate(II)
Authors: Leyva-Bailen Patricia , Powell Anthony V. , Vaqueiro Paz
Published: November 2007

In the title compound, [NH3(CH2)2NH3][Co(SO4)2(H2O)4], both the cation and anion are centrosymmetric. The CoII ion adopts a slightly distorted CoO6 octahedral geometry, arising from four water molecules and two monodentate SO4
2− anions. In addition to electrostatic interactions, the constituent species are linked through N—H...O and O—H...O hydrogen bonds, forming a three-dimensional network.
4,4′-Bis(4-fluorophenylsulfonyl)oxydibenzene
Authors: Lister Adam R. , Moratti Stephen C. , Simpson Jim
Published: November 2007

In the title compound, C24H16F2O5S2, the benzene rings of the central oxydibenzene unit are inclined at an angle of 83.49 (8)° to one another. Each of these benzene rings carries a p-substituted 4-fluorosulfonylbenzene group with dihedral angles of 77.27 (8) and 62.06 (11)° between the respective 4-fluorosulfonylbenzene and oxydibenzene rings. In the crystal structure, a complex network of C—H...F and C—H...O hydrogen bonds and a C—H...π interaction link the molecules into columns along the bc diagonal.
1-Anilino-2-hexylsulfanyl-4,4-dimethyl-1H-imidazol-5(4H)-one
Authors: Sun Shao-Fa , Chen Yu-Lu , Li Gui-Hua
Published: November 2007

In the title compound, C17H25N3OS, the mean plane of the imidazolinone system makes a dihedral angle of 83.07 (1)° with the phenyl ring. The crystal packing is stabilized by intermolecular N—H...N and C—H...O hydrogen-bonding interactions. The hexyl group is disordered over two sites with approximate occupancy factors 0.7:0.3.
catena-Poly[[[bis(2-methyl-1H-imidazole-κN
3)copper(II)]-μ-biphenyl-2,2′-dicarboxylato-κ2
O:O′] dihydrate]
Authors: Wang Liang , Li Xiu-Ying , Liu Yang , Wang Jian
Published: November 2007

In the title compound, {[Cu(C14H8O4)(C4H6N2)2]·2H2O}
n
, each CuII atom is four-coordinated by two N atoms from two 2-methyl-1H-imidazole (mi) ligands and two O atoms from two biphenyl-2,2′-dicarboxylate (dpdc) anions in a distorted square-planar coordination environment. Each dpdc ligand bridges two neighboring CuII atoms in a bis-monodentate mode, forming a zigzag chain along the b axis. These chains are decorated with mi ligands alternately on the two sides. O—H...O and N—H...O hydrogen bonds involving the water molecules link the chains together, forming a supramolecular structure.
N-(2-Furoyl)-N′-(6-methyl-2-pyridyl)thiourea
Authors: Hassan N. Norainun N. , Kadir Maisara A. , Yusof M. Sukeri M. , Yamin Bohari M.
Published: November 2007

The title molecule, C12H11N3O2S, adopts a cis–trans configuration of the furoyl and 6-methyl-2-pyridyl groups with respect to the thiono S atom across the thiourea C—N bonds. Intramolecular N—H...O, N—H...N and C—H...O hydrogen bonds contribute to the essential planarity of the molecular skeleton. In the crystal structure, weak intermolecular N—H...S hydrogen bonds link the molecules into centrosymmetric dimers.
2-Methylsulfanyl-1-(morpholin-4-ylmethyl)-1H-benzimidazole
Authors: Abou Akoun , Bany Guy E. , Kakou-Yao Rita , Seikou Touré , Ebby N'Dédé
Published: November 2007

In the title compound, C13H17N3OS, the morpholine ring has a chair conformation. The crystal structure exhibits intermolecular C—H...O and C—H...N interactions to form a consolidated array.
(S)-1,1-Dimethyl-N-[(S)-1-phenyl-3-(phenylsulfonyl)but-3-enyl]ethane-2-sulfinamide
Authors: Zhan Dan , Xiao Zuo-An , Liu Hua-Jun , Shi Xiao-Peng
Published: November 2007

The title compound, C20H25NO3S2, was obtained by the reaction of (S)-2-methyl-N-[(S)-1-phenyl-3-(phenylthio)but-3-enyl]propane-2-sulfinamide with 3-chloroperoxybenzoic acid (mCPBA) in dichloromethane solution. The absolute configuration was assigned by reference to the unchanging chiral centre in the synthetic procedure. The dihedral angle between the two benzene rings is 73.3 (2)°. The molecular conformation is likely influenced in part by intramolecular C—H...O hydrogen bonds, while the crystal packing is stabilized by intermolecular N—H...O hydrogen bonds and C—H...π interactions.
(3E)-5-Hydroxy-3-[5-(hydroxymethyl)furan-2-ylmethylene]-1-benzofuran-2(3H)-one
Authors: Ma Hong-Yan , Shi Ji , Wang Chang-Hong , Wang Zheng-Tao
Published: November 2007

The title compound, C14H10O5, was isolated from Senecio cannabifolius Less var. integrifolius aqueous extract. The structure was elucidated on the basis of spectroscopic data, including MS, 1H NMR and 13C NMR, and the relative configuration was confirmed by X-ray crystallographic analysis. The benzofuran ring is almost coplanar with the furan ring [dihedral angle = 10.47 (15)°]. A chain is formed through supramolecular R
2
2(10) synthons and three-centre hydrogen bonds.
3-[4-(Dimethylamino)benzylideneamino]-2-methylquinazolin-4(3H)-one
Authors: Kumaradhas P. , Sankara Lakshmi G. , Sridhar B. , Paneer Selvam P. , Saravanan G.
Published: November 2007

In the title compound, C18H18N4O, the dihedral angle between the quinazoline and benzylidene groups is 54.0 (4)°. In the crystal structure, the molecules associate into centrosymmetric dimers via C—H...O interactions.
3-(tert-Butyliminomethyl)-1,1′-binaphthol ethanol solvate
Authors: Ma Xiao-Yan , Zhong Lin-Zhi , Wu Wei , Wang Kun , Li Rui-Xiang
Published: November 2007

The 1,1′-bi-2,2′-naphthol (BINOL) backbone of the title compound, C25H23NO2·C2H6O, indicates that it has potential in asymmetric catalysis, with the two hydroxy and the imino groups providing sites for coordination with metal ions as an O/N heterotridentate ligand. There is an intramolecular O—H...N hydrogen bond which forms a ring, and intermolecular O—H...O hydrogen bonds to the ethanol solvent molecule, which link two ethanol molecules and two naphthol molecules around a centre of symmetry.
Hydrogen-bonding patterns in 2-amino-4,6-dimethoxypyrimidine–phthalic acid (1/1)
Authors: Thanigaimani Kaliyaperumal , Muthiah Packianathan Thomas , Lynch Daniel E.
Published: November 2007

In the title cocrystal, C6H9N3O2·C8H6O4, both carboxylic acid groups of phthalic acid form an R
2
2(8) ring motif (through N—H...O and O—H...N hydrogen bonds) on either side of the 2-amino-4,6-dimethoxypyrimidine molecule, generating a helical chain along the b axis. This chain is interpenetrated by a centrosymmetrically related chain to which it is linked by π–π stacking [perpendicular separation 3.332 Å, centroid–centroid distance 3.6424 (7) Å].
Bis(4-carboxypyridinium) aquapentakis(isothiocyanato-κN)iron(III) bis(pyridinium-4-carboxylate)
Authors: Li Xiu-Ling , Lu Zai-Sheng , Niu De-Zhong
Published: November 2007

In the crystal structure of the title compound, (C6H6NO2)2[Fe(NCS)5(H2O)]·2C6H5NO2, the iron complex lies on a mirror plane; the six-coordinate FeIII ion, the coordinated water molecule and three of the five isothiocyanate ligands are located on this plane. The crystal structure is triple-layered. The pyridinium-4-carboxylate (ina) molecules and the protonated 4-carboxypyridinium (inaH+) cations interact with each other through N—H...O and O—H...O hydrogen bonds, leading to the formation of a layer perpendicular to the b axis. Pairs of these layers sandwich another layer of {[Fe(NCS)5(H2O)]2−}
n
anions with which they interact via electrostatic attraction and O—H...O hydrogen bonds, resulting in sheets of triple layers also perpendicular to the b axis.
(Benzoyl)[2-(cyanoimino)-1,3-thiazolidin-2-yl]methyl acetate
Authors: Dai Hong , Zhang Xin , Liu Jian-Bing , Yu Hai-Bo , Fang Jian-Xin
Published: November 2007

The title compound, C14H13N3O3S, has been synthesized as a potent fungicidal agent. The 1,3-thiazolidine ring is approximately planar and makes a dihedral angle of 84.9 (2)° with the phenyl ring. There are weak intramolecular C—H...O and C—H...N hydrogen bonds, which stabilize the molecular structure.
Methyl 6-amino-5-cyano-4-(4-fluorophenyl)-2-methylpyridine-3-carboxylate
Authors: Wang Qian , Zhou Dianxiang , Li Chunmei , Shao Qingqing , Tu Shujiang
Published: November 2007

In the molecule of the title compound, C15H12FN3O2, the benzene and pyridine rings are oriented at a dihedral angle of 54.91 (2)°. In the crystal structure, there are intermolecular N—H...N hydrogen bonds.
N-(2-Amino-3-pyridyl)urea monohydrate
Authors: Li Nai-Gen , Tao Rui-Min , Fu Bang-Feng
Published: November 2007

In the crystal structure of the title compound, C6H9N4O·H2O, intermolecular O—H...N and N—H...O hydrogen bonds result in the formation of a supramolecular network structure; intramolecular O—H...N hydrogen bonds are also present.
4,4′-Bipyridine–2,4,5,6-tetrafluoro-1,3-diiodobenzene (1/1)
Authors: Metrangolo Pierangelo , Meyer Franck , Pilati Tullio , Resnati Giuseppe , Terraneo Giancarlo
Published: November 2007

The self-assembly of 1,3-diiodotetrafluorobenzene (13DITFB) and bipyridine (44BPY), C10H8N2·C6F4I2, is driven by halogen bonding. It results in infinite wave-like chains, with the two molecules in a 1:1 mole ratio. Both molecules lie on crystallographic mirror planes, bisecting the central 44BPY C—C bond and passing through two opposite CF groups of 13DITFB. The N...I halogen-bonding interaction is 2.902 (4) Å, and the C—I...N angle is almost linear [175.6 (2)°]. The chain ...13DITFB...44BPY... is polar, with all 13DITFB on the wave crest and all 44BPY at the bottom. This is in contrast to similar complexes obtained on self-assembly of 44BPY with 1,3-dibromotetrafluorobenzene (13DBrTFB), 1,4-diiodotetrafluorobenzene (14DITFB) or 1,2-diiodotetrafluorobenzene (12DITFB), where centrosymmetric wave-like chains are observed.
(2E)-3-(3,5-Dichloro-4-methoxy-2,6-dimethylphenyl)-1-(2,4-dichlorophenyl)prop-2-en-1-one
Authors: Jasinski Jerry P. , Butcher Ray J. , Mayekar Anil N. , Narayana B. , Yathirajan H. S.
Published: November 2007

In the title molecule, C18H14Cl4O2, the angle between the mean planes of the 3,5-dichloro-4-methoxy-2,6-dimethylphenyl and 2,4-dichlorophenyl groups is 47.6 (2)°. The 4-methoxy group, with a torsion angle of 91.9 (9)°, is twisted away from the plane of the 3,5-dichloro-2,6-dimethylphenyl ring in an anticlinal conformation. The ketone O atom of the prop-2-en-1-one group is twisted in a synclinal conformation with the 2,4-dichlorophenyl group [torsion angle = 45.5 (11)°]. The crystal packing is stabilized by intermolecular C—H...O hydrogen bonding between the ketone O atom from the prop-2-en-1-one group and an H atom from a nearby 2,4-dichlorophenyl group, which link the molecules into chains along the a axis. The 3,5-dichloro-4-methoxy-2,6-dimethylphenyl and 2,4-dichlorophenyl groups are aligned obliquely parallel to the ac face, with the benzene rings stacked obliquely along the b axis for both groups.
(2E)-1-(2,4-Dichlorophenyl)-3-[4-(diethylamino)-2-hydroxyphenyl]prop-2-en-1-one
Authors: Jasinski Jerry P. , Butcher Ray J. , Mayekar Anil N. , Narayana B. , Yathirajan H. S.
Published: November 2007

In the title molecule, C19H19Cl2NO2, the angle between the mean planes of the 2,4-dichlorophenyl and 2-hydroxyphenyl groups is 81.8 (2)°. The ketone oxygen of the prop-2-en-1-one group is twisted in a synclinal conformation with the 2,4-dichlorophenyl group [torsion angle = −75.7 (2)°]. The two diethyl extensions from the 4-(diethylamino)-2-hydroxyphenyl group are twisted in anti- and syn-periplanar conformations. Crystal packing is stabilized by intermolecular C—H...O hydrogen bonding between the ketone O atom from the prop-2-en-1-one group and H atoms from both the 2-hydroxyphenyl ring and the hydroxy group; these hydrogen bonds link the molecules into chains along the diagonal of the bc face of the unit cell. The 2-hydroxyphenyl rings are stacked obliquely parallel to the ab face while the 2,4-dichlorophenyl rings are stacked obliquely parallel to the bc face of the unit cell, each in an inverted conformation. Additional intermolecular packing interactions occur between π orbitals of the 4-hydroxyphenyl ring and an H atom from a nearby 2,4-dichlorophenyl ring.
Tetraethylammonium [12,12-diethyl-2,2,9,9-tetramethyl-1,4,7,10-tetraza-5,6-benzotridecane-3,8,11,13-tetraone(4−)]oxidomanganate(V)
Authors: Berggren Gustav , Kaynak Filiz Betul , Anderlund Magnus F. , Eriksson Lars , Åkermark Björn
Published: November 2007

The MnV complex in the title compound, (C8H20N)[Mn(C21H26N4O4)O], is interesting as it has been suggested that MnV oxospecies are intermediates both in epoxidation of alkenes and in water oxidation in PSII, i.e. photosystem II, the protein found in oxygenic photosynthetic organisms, which uses light to split water into O2, protons and electrons. The Mn atom has a square-pyramidal coordination of four N atoms with an apical O atom. The four N atoms coordinating to Mn [Mn—N = 1.872 (2)–1.882 (2) Å] form a plane within 0.03 (3) Å from which the Mn ion is displaced by 0.582 (2) Å.
Bis[(3-hydroxy-2-naphthyl)(2-pyridylmethylenehydrazono)methanolato]nickel(II)
Authors: Kang Wenjun , Sun Shizhu , Li Dacheng , Wang Daqi , Dou Jianmin
Published: November 2007

In the title complex, [Ni(C17H12N3O2)2], the NiII ion is coordinated by two O [Ni—O = 2.066 (3) and 2.068 (3) Å] and four N [Ni—N = 1.982 (3)–2.120 (3)Å] atoms in a distorted octahedral geometry. Two intramolecular O—H...N hydrogen bonds contribute to the molecular conformation. Weak intermolecular C—H...O hydrogen bonds stabilize the crystal packing.
1-(4-Acetylphenyl)-2,5-dimethyl-1H-pyrrole
Authors: Santos Ana C. , Marques Ana T. , Ramos Silva Manuela , Matos Beja Ana , Sobral Abilio J. F.N.
Published: November 2007

In the title compound, C14H15NO, the molecules are joined via C—H...O interactions into chains along the b axis. The planes of the pyrrole and benzene rings are at an angle of 62.17 (10)° with respect to each other.
2-Methyl-5-[3-(4-nitrophenyl)-1,2,4-oxadiazol-5-ylmethylenesulfanyl]-1,3,4-thiadiazole
Authors: Wang Pin-Liang , Kang Si-Shun , Li Hai-Ling , Zeng Hai-Su , Wang Hai-Bo
Published: November 2007

The title compound, C12H9N5O3S2, was synthesized via condensation of 1,2,4-oxadiazole chloromethane with 1,3,4-thiadiazolethiol. The benzene and oxadiazole rings are almost coplanar, making a twist angle of only 4.6 (3)°, but the thiadiazole ring deviates from the molecular plane, making a dihedral angle of 87.9 (3)° with the oxadiazole ring.
(E)-4-Bromo-2-(2-methoxyphenyliminomethyl)phenol
Authors: Gül Zarife Sibel , Erşahin Ferda , Ağar Erbil , Işık Şamil
Published: November 2007

The molecule of the title compound, C14H12BrNO2, is almost planar and the dihedral angle between the planes of the two aromatic rings is 3.8 (2)°. The molecule exists in the crystal structure in the phenol–imine tautomeric form, with the H atom located on O rather than on N. This H atom is involved in a strong intramolecular hydrogen bond.
Methyl 2-{[(E)-8-oxo-5,8-dihydroquinolin-5-ylidene]hydrazino}benzoate
Authors: Basu Baul Tushar S. , Mizar Archana , Tiekink Edward R. T.
Published: November 2007

The non-H atoms in the title compound, C17H13N3O3, are almost coplanar, a conformation stabilized by intramolecular N—H...O and C—H...O interactions. A supramolecular chain mediated by C—H...O interactions is found in the crystal structure and these pack side-by-side into layers. The layers are consolidated into the crystal structure by further C—H...O and C—H...N interactions.
2,6-Diaminopyrimidin-4(3H)-one–4-nitrobenzoic acid (1/1)
Authors: Subashini Annamalai , Muthiah Packianathan Thomas , Bocelli Gabriele , Cantoni Andrea
Published: November 2007

In the title compound, C4H6N4O·C7H5NO4, there are two types of base-pairing motifs, one involving a pair of N—H...N hydrogen bonds and the other involving a pair of N—H...O hydrogen bonds. These paired molecules are further linked by N—H...O hydrogen bonds to generate DADA and DDAA (D = donor and A = acceptor) arrays leading to a supramolecular sheet.
Diazidobis(2,2′-biimidazole)copper(II)
Authors: Liu Ying , Dou Jianmin , Li Dacheng , Zhang Xianxi
Published: November 2007

In the title compound, [Cu(N3)2(C6H6N4)2], the Cu atom (site symmetry \overline{1}) is bonded to two azide ions and two bidentate biimidizole ligands, resulting in a slightly distorted octahedral CuN6 geometry for the metal. In the crystal structure, N—H...N hydrogen bonds help to consolidate the packing.
Poly[tetramethylammonium [μ4-bromido-di-μ2-bromido-dicuprate(I)]]
Authors: Liu Xi
Published: November 2007

The title compound, {(C4H12N)[Cu2Br3]}
n
, consists of CuI-bromide complex anions and tetramethylammonium cations. The bromide ions bridge CuI ions to form one-dimensional polymeric chains. Both the cation and the anion have mirror symmetries; in the cation, the N atom and two C atoms are located on a mirror plane, while in the complex anion, the three bromide ions are located on two different mirror planes. No hydrogen bonding occurs in the crystal structure.
(2-Amino-4,5-dimethylbenzenesulfonato-κN)aquasilver(I) monohydrate
Authors: Li Yu-Jie , Li Shi-Hua , Dong Xian-Wu
Published: November 2007

The title compound, [Ag(C8H10NO3S)(H2O)]·H2O, has a mononuclear structure in which the Ag+ cation is two-coordinated by one N atom from a 2-amino-4,5-dimethylbenzenesulfonate anion and one water O atom in a nearly linear arrangement. A network of O—H...O and N—H...O hydrogen bonds helps to consolidate the crystal packing.
3-Benzylidene-8-methoxy-6-(prop-2-enyl)chroman-4-one
Authors: Suresh R. , Kanagam Charles C. , Umarani P. R. , Manivannan V. , Büyükgüngör Orhan
Published: November 2007

In the title compound, C20H18O3, the phenyl ring makes a dihedral angle of 39.97 (4)° with the benzene ring of the chromanone unit. The molecular structure and the crystal packing are stabilized by weak intra- and intermolecular C—H...O interactions.
2,3-Dimethoxy-10-oxostrychnidinium 2-carboxy-4,5-dichlorobenzoate
Authors: Smith Graham , Wermuth Urs D. , White Jonathan M.
Published: November 2007

The structure of the title compound, C23H27N2O4
+·C8H3Cl2O4
−, a 1:1 proton-transfer compound of brucine with 4,5-dichlorophthalic acid, has been determined at 130 K. The brucinium cations and the hydrogen phthalate anions associate through single N—H...Ocarboxylate hydrogen bonds [2.639 (3) Å], giving dimers which are extended via weak head-to-tail C—H...Omethoxy associations into chains forming down the 21 screw axis of the unit cell. The carboxyl proton of the anion gives a short intramolecular O—H...Ocarboxylate hydrogen bond [2.441 (3) Å].
(R,E)-[4-(Benzyloxy)-2-(cinnamoyloxy)-4-oxobutyl]trimethylammonium chloride hydrochloride
Authors: Li Xun , Gong Xiao-Wei , Li Jin-Pei , Wang Wei-Xia , Xu Wen-Fang
Published: November 2007

The title compound, C23H28NO4
+·Cl−·HCl, is a quaternary ammonium salt with a scaffold similar to that of acetyl-L-carnitine hydrochloride. The two Cl atoms in the structure are tightly bonded by a strong Cl—H...Cl hydrogen bond with a Cl...Cl separation of 3.068 (2) Å. The cations are held together partly by a range of C—H...O and C—H...π interactions.
Bis{(E)-1-[1-(2-pyridyl)ethylidene]thiosemicarbazonato-κ3
N,N′,S}gallium(III) nitrate
Authors: Fan Ying-Ju , Ma Jian-Ping , Sun Zhong-Xi
Published: November 2007

Reaction of gallium(III) nitrate with (E)-1-[1-(2-pyridyl)ethylidene]thiosemicarbazide (petc) afforded the title complex, [Ga(C8H9N4S)2]NO3. The title complex contains one GaIII cation and two enol-form petc anions, accompanied by one charge-balancing disordered nitrate anion. The petc is in the enol form, coordinating to the GaIII centre via one S atom and two N atoms. Thus, the GaIII centre assumes a distorted octahedral coordination geometry.
2-Methyl-1-(pyrrolidinium-2-ylmethyl)pyridinium dibromide
Authors: Wang Liping , Yue Huadong , Liu Xuefen , Luo Shuping , Xu Danqian
Published: November 2007

In the title compound, C11H18N2
2+·2Br−, whose cation represents the product of racemization of an L-proline derivative under basic conditions, the pyrrolidinium ring has a distorted envelope conformation with the N atom deviating by 0.533 (6) Å from the mean plane of the remaining four atoms of the ring. The methylene C atom which connects the pyrrolidinium ring and the 2-methylpyridine group is displaced from the plane of the four pyrrolidinium C atoms by 0.625 (8) Å in the same direction as the N atom. The cation and anions are linked by N—H...Br hydrogen bonds.
Bis[2-(2-hydroxybenzoylhydrazono)propionato]nickel(II) trihydrate
Authors: Wu Wei-Ping , Zeng Feng-Chun , Wu Yu
Published: November 2007

In the title compound, [Ni(C10H9N2O4)2]·3H2O, the Ni2+ ion is octahedrally coordinated by carboxyl and acyl O atoms and azomethine N atoms of two tridentate 2-(2-hydroxybenzoylhydrazono)propionate ligands, each of which forms two five-membered chelate rings sharing the N—Ni bond. The occurrence of O—H...N and O—H...O hydrogen bonds between water molecules and ligands results in the formation of an intricate three-dimensional network which stabilizes the packing.
5-Chloromethyl-3-(3,5-dimethoxyphenyl)-1,2,4-oxadiazole
Authors: Wang Pin-liang , Zeng Hai-su , Wang Hai-bo , Wu Wen-yuan
Published: November 2007

In the title compound, C11H11ClN2O3, the substituted phenyl ring and the oxadiazole system are essentially coplanar. Close intramolecular C—H...N interactions are observed.
Bis(μ-1H-benzimidazole-5,6-dicarboxylato)bis[tetraaquadicobalt(II)] pentahydrate
Authors: Lo Yu-Lin , Wang Wen-Chieh , Lee Gon-Ann , Liu Yen-Hsiang
Published: November 2007

The title compound, [Co2(C9H4N2O4)2(H2O)8]·5H2O, contains two CoII ions that are bridged by two 1H-benzimidazole-5,6-dicarboxylate ligands to form an M
2
L
2 type complex (M = metal and L = ligand). There are two crystallographically distinct M
2
L
2 units, each on an inversion centre, along with coordinated and uncoordinated water molecules, in the asymmetric unit. The CoII ions are octahedral. Extensive hydrogen bonding exists between the complex and water molecules, and this helps to stabilize the crystal structure. One water molecule is disordered over two sites with occupancies 0.84:0.16.
2-(1,4-Dioxo-1,4-dihydro-2-naphthyl)-2-methylpropanoic acid
Authors: Dempster-Rivett Kieran J. , Main Lyndsay , Nicholson Brian K. , Denny William A.
Published: November 2007

The sterically crowded title compound, C14H12O4, crystallizes as centrosymmetric hydrogen-bonded dimers involving the carboxyl groups. The naphthoquinone ring system is folded by 11.5 (1)° about a vector joining the 1,4-C atoms, and the quinone O atoms are displaced from the ring plane, presumably because of steric interactions with the bulky substituent.
Bis{2-methoxy-6-[3-(methylamino)propyliminomethyl]phenolato}nickel(II)
Authors: Tang Chun-Bao
Published: November 2007

The title complex, [Ni(C12H17N2O2)2], possesses a crystallographically imposed center of symmetry occupied by the NiII ion. Each 2-methoxy-6-[3-(methylamino)propyliminomethyl]phenolate ligand coordinates the Ni atom in a tridentate mode [Ni—O = 2.0356 (18) Å, and Ni—N = 2.048 (2) and 2.184 (2) Å], resulting in a distorted octahedral coordination geometry.
Tris(3,3′-diamino-2,2′-bipyridine)zinc(II) dinitrate
Authors: Wu Chang-Ju , Chen Ju-Na , Shi Jing-Min
Published: November 2007

In the title complex, [Zn(C10H10N4)3](NO3)2, the six-coordinate ZnII atom lies at the intersection of three twofold axes in a slightly disorted octahedral coordination environment. The N atom of a nitrate anion is located on a threefold axis. In the crystal structure, intermolecular N—H...N and N—H...O hydrogen bonds between cations and anions form a two-dimensional network perpendicular to the c axis.
N-(2-Benzylidenepropylidene)-4-bromoaniline
Authors: Khalaji Aliakbar Dehno , Slawin Alexandra M. Z. , Woollins J. Derek
Published: November 2007

The title compound, C16H14BrN, at 93 (2) K crystallizes with two independent molecules in the asymmetric unit. The molecules are slightly non-planar with the substituents adopting an E configuration with respect to the imine C=N bond.
[(Z)-2-(3-Methyl-1,2,4-oxadiazol-5-yl)-2-(1-naphthyl)ethenylamino]formaldehyde oxime 1,4-dioxane hemisolvate
Authors: Okuda Kensuke , Watanabe Hiromi , Hirota Takashi , Gotoh Kazuma , Ishida Hiroyuki
Published: November 2007

In the asymmetric unit of the title compound, C16H14N4O2·0.5C4H8O2, there are two crystallographically independent oxime molecules and one solvent molecule. Each oxime molecule has intramolecular N—H...O and N—H...N hydrogen bonds, which make the non-H atoms approximately coplanar except for the naphthyl groups. The two independent molecules are connected to each other by O—H...N hydrogen bonds, forming a dimer. Dimers are linked into a layer through C—H...O, C—H...N and C—H...π interactions. There is π-stacking of approximately parallel oxadiazole rings, with a centroid–centroid distance of 3.6234 (9) Å and a dihedral angle of 8.90 (6)°. Dioxane C and H atoms are disordered over two sites each, with occupancy factors of ca 0.78:0.22.
cyclo-Tetrakis[μ-N-(2-hydroxybenzoyl)-N′-(2-hydroxy-3-methoxybenzylidene)hydrazinato(2−)]tetranickel(II) N,N-dimethylformamide tetrasolvate
Authors: Guan Guizhi , Gao Yuxiang , Wang Lixia , Wang Tao
Published: November 2007

The title compound, [Ni4(C15H12N2O4)4].4C3H7NO, is isostructural with its CoII and ZnII analogues. The compound contains N-(2-hydroxybenzoyl)-N-(2-hydroxy-3-methoxybenzylidene)hydrazine anions and NiII cations linked into a tetrameric complex about a position of \overline{4} point symmetry. Each NiII cation is pentacoordinate with a distorted square-based pyramidal geometry. The ligand exhibits an intramolecular O—H...N hydrogen bond.