bluuebunny/crossref_metadata_2025 huggingface dataset:
N,N′-Bis[(4-chloroanilino)thiocarbonyl]isophthalamide dimethylformamide solvate
Authors: Zhang You-Ming , Cao Cheng , Lin Qi , Wei Tai-Bao
Published: May 2006

The principal molecule of the title compound, C22H16Cl2N4O2S2·C3H7NO, is not planar; the three benzene rings are tilted with respect to each other, with dihedral angles of 5.51 (11), 60.06 (12) and 64.33 (11)°. Intermolecular hydrogen bonding and π–π stacking help to stabilize the crystal structure.
1,1′-(2,5-Dimethyl-1,4-phenylenemethylene)di-1H-imidazole dihydrate
Authors: Wang Wen-Hua , Dou Wei , You Zhong-Lu , Liu Wei-Sheng , Wang Da-Qi
Published: May 2006

In the title compound, C16H18N4·2H2O, there is one half-molecule (organic) and one water molecule in the asymmetric unit, the organic molecule being centrosymmetric. The separation of the two terminal N atoms is 11.296 (8) Å and the dihedral angle between the benzene and imidazole rings is 85.27 (18)°; the molecule adopts a Z-shaped conformation. A one-dimensional water chain links the organic molecules, forming a two-dimensional ladder-shaped network along the b-axis direction through intermolecular O—H...O and N—H...O hydrogen bonds.
3,6-Dibromo-9-(4-tolylsulfonyl)-9H-carbazole
Authors: Li Ning , Huang Peng-Mian , Xiong Xiao-Li , Xu Xiao-Dong , Shao Zhong-Jie
Published: May 2006

The title compound, C19H13Br2NO2S, was synthesized by N-alkylation of 4-methylbenzenesulfonyl chloride with 3,6-dibromo-9H-carbazole. The carbazole ring system is essentially planar, with a mean deviation of 0.024 Å, and makes a dihedral angle of 75.46 (9)° with the plane of the benzene ring.
Bis(2,2′-bipyridine){3,8-bis[2-(4-tolyl)ethynyl]-1,10-phenanthroline}ruthenium(II) bis(hexafluorophosphate)
Authors: Shiotsuka Michito , Inui Yasuhiro , Ito Mitsuhiro , Onaka Satoru , Ozeki Tomoji , Chiba Hirokazu
Published: May 2006

The asymmetric unit of the title compound, [Ru(C10H8N2)2(C30H20N2)](PF6)2, contains a monomeric [Ru(bpy)2(dtephen)] cation {bpy is 2,2′-bipyridine and dtephen is 3,8-bis[2-(4-tolyl)ethynyl]-1,10-phenanthroline} and two hexafluorophosphate anions. The ruthenium(II) ion is in a distorted octahedral environment coordinated by two bpy ligands and one dtephen ligand. The dtephen ligand is almost planar. π–π stacking interactions and C—H...F hydrogen bonds are observed in the crystal structure.
A hydrogen-bonded C(6) chain in glyoxal 3-nitrophenylhydrazone
Authors: Low John N. , Wardell James L. , Glidewell Christopher
Published: May 2006

The molecules of the title compound, C8H7N3O3, which are nearly planar, are linked into simple C(6) chains by an N—H...O hydrogen bond.
6,9-Dibromo-2a,10b-diphenyl-2a,5,10,10b-tetrahydro-2H,3H-2,3,4a,10a-tetraazabenzo[g]cyclopenta[cd]azulene-1,4-dione monohydrate
Authors: She Neng-Fang , Hu Sheng-Li , Guo Hui-Zhen , Wu An-Xin
Published: May 2006

The title compound, C24H18Br2N4O2·H2O, forms a supramolecular structure via N—H...O, O—H...O and C—H...O hydrogen bonds. In the crystal structure, the water molecule serves as a bifurcated hydrogen-bond acceptor and as a hydrogen-bond donor.
{2-[2-(1H-1,3-Benzimidazol-2-yl)ethyliminomethyl]-4-chlorophenolato}thiocyanatocopper(II) monohydrate
Authors: Qiu Xiao-Hang , Zhao Jun , Tong Xiao-Lan
Published: May 2006

In the title compound, [Cu(C16H13ClN3O)(NCS)]·H2O, the CuII atom adopts a distorted square-planar coordination with two N atoms and one O atom of the tridentate phenolate ligand, and one N atom of the thiocyanate anion. N—H...S, O—H...O and C—H...O hydrogen bonds give rise to a two-dimensional network.
2,9-Dimethyl-3,8-bis(methylsulfanyl)naphtho[2,1-b:3,4-b′]difuran
Authors: Choi Hong Dae , Jang Ji Bong , Seo Pil Ja , Son Byeng Wha , Lee Uk
Published: May 2006

The title compound, C18H16O2S2, was prepared by the Lewis acid-catalysed reaction of 2,3-dihydroxynaphthalene with α-chloro-α-(methylsulfanyl)acetone. The naphtho[2,1-b:3,4-b′]difuran unit is nearly planar, with a mean deviation from the least-squares plane of 0.028 Å. In the crystal structure, aromatic π–π stacking interactions are observed between adjacent molecules.
μ-Terephthalato-κ2
O
1:O
4-bis[bis(propane-1,3-diamine-κ2
N,N′)iron(II)] bis(perchlorate)
Authors: Hu Ren-Zhi , Wang Jian-Hua , Cheng Kui , Li Zhi-Bin , Yan Zheng , Liu Jing-Jing
Published: May 2006

The dinuclear title complex, [Fe2(C8H4O4)(C3H10N2)4](ClO4)2, is centrosymmetric about the central aromatic ring. The Fe centre is five-coordinated square pyramidal, being coordinated by four N atoms from two propane-1,3-diamine ligands and an O atom from a monodenate carboxylate residue.
4,4′-Dibenzyl-5,5′-(pyridine-2,6-diyl)bis(3,4-dihydro-2H-1,2,4-triazole-3-thione)
Authors: Demir Sibel , Dinçer Muharrem , Çetin Ahmet , Dayan Osman , Cansız Ahmet
Published: May 2006

The title compound, C23H19N7S2, adopts the ketoamine tautomeric form and displays C—H...N hydrogen-bonding interactions. There are two independent molecules in the asymmetric unit.
3,3-Dimethylpyrrolidine-2,4-dione
Authors: Hamzah A. Sazali , Shaameri Zurina , Yamin Bohari M.
Published: May 2006

In the title compound, C6H9NO2, the asymmetric unit consists of three molecules. All the five-membered rings are essentially planar. The molecule is stabilized by intermolecular N—H...O and C—H...O interactions, forming a two-dimensional network parallel to (100).
The 1:1 adduct of antimony trifluoride with [1.5]dibenzothia-18-crown-6
Authors: Fonari Marina S. , Ganin Eduard V. , Gelmboldt Vladimir O. , Lipkowski Janusz , Kotlyar Sergei A. , Kamalov Gerbert L.
Published: May 2006

In the title compound [systematic name: 6,7,9,10,12,13,15,16-octahydrodibenzo[n,q][1,4,7,10,13,16]pentaoxathiacyclooctadecine antimony(III) trifluoride clathrate], (C20H24O5S)SbF3], the components are held together via electrostatic interactions between the antimony lone pair and the collective electron system of the macrocycle. The antimony trifluoride molecule is situated in a perching mode above the macrocyclic cavity, its coordination being completed by three crown ether O atoms at distances in the range 2.737 (1)–3.136 (1) Å. Neighboring 1:1 adducts are linked into chains via C—H...F hydrogen bonds.
5-cis-Bromo-2,2,6,6-tetramethyltetrahydropyran-3-carboxylic acid
Authors: Hartung Jens , Greb Marco , Svoboda Ingrid , Fuess Hartmut
Published: May 2006

Enantiomers of the title compound, C10H17BrO3, form hydrogen-bonded centrosymmetric dimers, where the carboxy H atom serves as donor and the C=O group of a neighbouring molecule acts as acceptor. The proximity of two axial methyl substituents causes distortions of the tetrahydropyran chair conformation, which are evident from the magnitude of the endocyclic bond angle at the O atom and the values of the endocyclic torsion angles.
Eudesma-5,12-dien-13-oic acid from Laggera pterodonta
Authors: Xu Ying-Qian , Lv Yue-Dong , Quan Yan-Ling
Published: May 2006

The title compound, C15H22O2, is an eudesmane sesquiterpenoid which was isolated from Laggera pterodonta (DC) Benth. The molecule contains two six-membered rings. An intermolecular hydrogen bond is formed between the hydroxy and carbonyl groups.
Pterodontic acid
Authors: Mei Zhi-Nan , Li Yun-Fang , Yu Xin , Yang Guang-Zhong
Published: May 2006

In the title compound, C15H22O2, the C=C bond lengths in the cyclohexene ring and the allylic acid group [1.325 (3) and 1.324 (3) Å] are almost equal and are shorter than those observed in ethylene. The C=O and C—O bond lengths in the allylic acid group [1.201 (3) and 1.321 (3) Å] are almost equal to those of formic acid. There is an intramolecular hydrogen bond between the allylic acid H atom and the hydroxy O atom [C...O = 2.673 (2) Å and C—H...O = 101°].
cis-5-Bromo-2,2,6-trimethyl-trans-6-phenyltetrahydropyran-3-carboxylic acid
Authors: Hartung Jens , Bergsträßer Uwe , Greb Marco , Svoboda Ingrid , Fuess Hartmut
Published: May 2006

Centrosymmetric hydrogen-bonding between carboxy substituents links enantiomers of the title compound, C15H19BrO3, into dimers. Close contacts that originate from axially arranged methyl substituents in positions 2 and 6 induce distortions, which are evident from a widening of the endocyclic bond angle at the ring O atom [122.6 (6)°] and a flattening of the tetrahydropyran chair.
3α,7α,12α-Triformyloxy-24-nor-5β-chol-22-ene
Authors: Andrade L. C. R. , Paixão J. A. , de Almeida M. J. M. , Tavares da Silva E. J. , Fernandes Roleira F. M.
Published: May 2006

The title compound, C26H38O6, has a cis junction between two of the six-membered rings (A and B). All three of the six-membered rings have chair conformations that are slightly flattened and the five-membered ring has an unusual 13β-envelope conformation. The 7α and 12α ring substituents are both axial and the 3α and 17β groups are equatorial and pseudo-equatorial, respectively. The 3α-formyloxy group is involved in one weak intermolecular C—H...O bond, which links the molecules into dimers in a head-to-head fashion.
catena-Poly[[(2,2′-diquinolyl)zinc(II)]-μ-terephthalato]
Authors: Li Zhao-Hui , Ao Wen-Jiang , Wang Xu-Xu , Fu Xian-Zhi
Published: May 2006

The title complex, [Zn(C18H12N2)(C8H4O4)]
n
, consists of a one-dimensional zigzag [Zn(tpa)(quin)]
n
chain (tpa = terephthalate and quin = 2,2′-diquinolyl) with a pitch of 17.907 (2) Å. The tpa ligands bridge two Zn atoms in alternately bis(bidentate) and bis(monodentate) coordination modes. Each Zn atom is coordinated by two N atoms from a chelating quin, two O atoms from one bis(bidentate) tpa and one O atom from one bis(monodentate) tpa. The five-coordinate Zn geometry can be best described as distorted trigonal–bipyramidal.
1-(3-Chlorobenzoyl)-3-phenylthiourea
Authors: Khawar Rauf M. , Badshah Amin , Bolte Michael
Published: May 2006

The phenyl and benzoyl groups in the title compound, C14H11ClN2OS, are cis and trans, respectively, with respect to the C=S bond. The crystal packing is characterized by N—H...O and N—H...S hydrogen bonds.
The scheelite-type europium molybdate Eu0.96MoO4
Authors: Gall P. , Gougeon P.
Published: May 2006

Eu0.96MoO4 crystallizes with the scheelite-type structure in the space group I41/a. The Eu and Mo atoms are in 4b and 4a positions with \overline{4} symmetry, and the O atoms are in general 16f positions.
N-[4-(Morpholinocarbonylmethoxy)phenyl]acetamide monohydrate: a potential antiamnesic agent
Authors: Sundar T. V. , Parthasarathi V. , Lang H. , Malik R. , Piplani P.
Published: May 2006

In the title compound, C14H18N2O4·H2O, a potential antiamnesic agent, the morpholine ring adopts a symmetric chair conformation. The conformation of the molecule in the crystal structure and that of the energy-minimized free molecule do not differ significantly. In the crystalline state, the molecules are stabilized by intermolecular N—H...O, O—H...O and weak C—H...O interactions.
trans-Tetraaquabis[3-(4-pyridyl)acrylato-κN]zinc(II)
Authors: Yang E. , Chen Qi-Yan , Chen Gu-Yong
Published: May 2006

The title complex, [Zn(C8H6NO2)2(H2O)4], consists of a central zinc(II) atom coordinated by two trans 3-(4-pyridyl)acrylate ligands via their N atoms and by four water ligands. The Zn atom is located on a centre of inversion. Extensive inter-complex hydrogen bonding occurs between the water ligands and the carboxylate groups, resulting in a three-dimensional network.
N,N′-Bis(2,6-dichlorobenzylidene)hydrazine
Authors: Zheng Peng-Wu , Qiu Qiao-Mei , Lin Yu-Yan , Liu Ke-Fan
Published: May 2006

The title compound, C14H8Cl4N2, was synthesized by the reaction of 2,6-dichlorobenzaldehyde with hydrazine hydrate. The two benzene rings are nearly parallel, forming a dihedral angle of 2.9 (4)°. A weak intermolecular C—H...N hydrogen bond links the molecules into an infinite chain running along [100].
Carbonyl(cyclohexyldiphenylphosphine)(8-hydroxyquinolinato)rhodium(I)
Authors: Janse van Rensburg J. Marthinus , Roodt Andreas , Muller Alfred
Published: May 2006

The molecules of the title compound, [Rh(C9H6NO)(C18H21P)(CO)], pack with the H atoms of the phenyl and cyclohexyl rings at distances of 2.80–2.85 Å from the adjacent oxine ligand plane. The effective cone angle (ΘE) for the phosphine ligand is 151°. The bidentate oxine ligand has a bite angle of 79.41 (9)° and the Rh—P bond length is 2.2798 (8) Å.
Poly[propane-1,2-diammonium μ-disulfido-deca-μ-sulfido-disulfidooctaantimonate(III)]
Authors: Puls Angela , Näther Christian , Bensch Wolfgang
Published: May 2006

In the structure of the title compound, {(C3H13N2)[Sb8S14]}
n
, SbS3 pyramids are joined to form an [Sb4S7] chain. Two adjacent chains are joined via an S2 bridge, yielding the final [Sb8S14]2− anion. The structure-directing organic cations are located in the plane of large rings composed of ten S and eight Sb atoms. If Sb—S bonds longer than 3.1 Å are considered, a three-dimensional network with two types of channels is observed.
3-(4-Hydroxyanilino)isobenzofuran-1(3H)-one
Authors: Odabaşoğlu Mustafa , Büyükgüngör Orhan
Published: May 2006

The title compound, C14H11NO3, is stabilized by intermolecular O—H...O, N—H...O and C—H...O hydrogen bonds, and by three C—H...π intermolecular interactions. The N—H...O and O—H...O hydrogen bonds generate edge-fused R
4
4(26) rings. The phthalide ring system of the molecule is almost planar and forms a dihedral angle of 63.02 (7)° with the second benzene ring.
4,4′-Bis(2,6-dichlorobenzylideneamino)biphenyl
Authors: Hou Zhen-Yu , Zhu Dong-Mei , Ng Seik Weng
Published: May 2006

The title molecule, C26H16Cl4N2, lies on a crystallographic inversion centre and is disordered. The dihedral angle between the two benzene rings of the central biphenyl unit is 34.4 (3)°. The unique benzene ring of the biphenyl group is essentially coplanar with the –C(H)=N– unit, whereas the 2,6-dichlorophenyl substituent is twisted with respect to it. The reason for the twisted conformation is attributed to steric crowding by the Cl atoms.
1-[2-(1,3-Benzothiazol-2-ylimino)imidazolidin-1-yl]ethanone
Authors: Yıldırım Sema Öztürk , Akkurt Mehmet , Servi Süleyman , Şekerci Memet , Fun H.-K.
Published: May 2006

With the exception of seven H atoms, the molecule of the title compound, C12H12N4OS, is planar. Two intramolecular N—H...N and C—H...N hydrogen bonds are observed in the crystal structure.
The twinned crystal structure of diiodobis(triphenylphosphine)palladium(II) dichloromethane disolvate at 173 K
Authors: Theissmann Thomas , Bolte Michael
Published: May 2006

The structure of the title compound, [PdI2(C18H15P)2]·2CH2Cl2, has previously been reported by Debaerdemaeker, Kutoglu, Schmid & Weber [Acta Cryst. (1973), B29, 1283–1288] at room temperature. We report the structure determination of this compound from a twinned crystal at 173 (2) K. The Pd atom is located on a centre of inversion and has square-planar coordination geometry.
[3,3′,3′′-(1,4,7-Triazacyclononane-1,4,7-triyl)tripropanamide]nickel(II) bis(perchlorate)
Authors: Liu Rui , Li Yi-Zhi , Zhang Zhong , Wang Zhi-Lin
Published: May 2006

In the title compound, [Ni(C15H30N6O3)](ClO4)2, the NiII atom is coordinated by three N and three O atoms from the 3,3′,3′′-(1,4,7-triazacyclononane-1,4,7-triyl)tripropanamide (tcet) ligand in a pseudo-octahedral geometry. The [Ni(tcet)]2+ complex cations are linked by N—H...O hydrogen bonds to form zigzag chains, which are further connected into a three-dimensional network by N—H...O hydrogen bonds with ClO4
− anions.
Pentaaquahydroxoscandium(III) dibromide, [Sc(H2O)5(OH)]Br2
Authors: Kolitsch Uwe
Published: May 2006

[Sc(H2O)5(OH)]Br2 is a scandium(III) halide compound that contains centrosymmetric [Sc(H2O)5(OH)]2
4+ dimeric cationic units built from two edge-sharing (hydroxo-bridged) symmetrically equivalent Sc(H2O)5(OH)2 polyhedra. The mean Sc—O bond length is 2.156 Å. The hydrogen bonds (O...Br) are of low strength. All atoms are in general positions.
2-(1-Naphthyliminomethyl)phenol
Authors: Cheng Kui , Zhu Hai-Liang , Liu Jing-Jing , Gao Meng , Zeng Jun-He
Published: May 2006

In the molecule of the title compound, C17H13NO, the naphthalene ring system is essentially planar. A strong intramolecular O—H...N hydrogen bond results in the formation of a pseudo-six-membered planar ring, which makes a dihedral angle of 2.85 (5)° with the phenol ring.
3-Acetyl-4-furyl-1-methylspiro[pyrrolidine-2,2′-indol]-2′(3′H)-one
Authors: Subbiahpandi A. , Velmurugan D. , Ravikumar K. , Durga R. R. , Raghunathan R.
Published: May 2006

In the title compound, C18H18N2O3, the central pyrrolidine ring adopts a half-chair conformation. The furan ring is almost perpendicular to the oxindole system. Intermolecular C—H...O and N—H...N hydrogen bonds link the molecules into ribbons running along the b-axis direction.
4-Amino-5-(4-chlorophenoxymethyl)-2-(2-cyanoethyl)-2H-1,2,4-triazole-3(4H)-thione monohydrate
Authors: He Ting , Li Yi-Zhi , Hu Hong-Wen
Published: May 2006

In the title molecule, C12H12ClN5OS·H2O, all the bond lengths and angles have normal values. O—H...O, O—H...N, N—H...S, C—H...O and C—H...N hydrogen bonds, with C—H...π interactions, link the molecules into a three-dimensional network.
1-(1H-Benzimidazol-2-yl)ethanone
Authors: Yang Xiao-Yan , Li Ying , Li Yan , Li Xue-Mei , Zhang Shu-Sheng
Published: May 2006

In the title compound, C9H8N2O, all non-H atoms are essentially coplanar. N—H...O hydrogen bonds generate a centrosymmetric R
2
2(10) dimer.
3,5-Dimethoxybenzohydrazide
Authors: Liu Hui-Yan , Gao Feng , Lu Zai-Sheng , Niu De-Zhong
Published: May 2006

The title compound, C9H12N2O3, was synthesized by the reaction of ethyl 3,5-dimethoxybenzoate with hydrazine. X-ray analysis reveals that the asymmetric unit contains two independent molecules. N—H...O and C—H...O hydrogen bonds link the molecules into layers. Molecules in adjacent layers are linked via N—H...O hydrogen bonds.
[1,3-Bis(diphenylphosphino)propane]tetracarbonylchromium(0)
Authors: Shawkataly Omar bin , Islam Shahinoor Dulal , Fun Hoong-Kun , Didierjean Claude
Published: May 2006

In the title molecule, [Cr(C27H26P2)(CO)4], the Cr atom is octahedrally coordinated by the four carbonyl ligands and a bidentate phosphine ligand, which is bonded as a chelate in a cis position. The average Cr—P and Cr—C bond lengths are 2.3770 (5) and 1.865 (2) Å, respectively.
(E)-2-Bromo-4,5-dimethoxybenzaldehyde oxime
Authors: Li Xiang , Tian Da-Min
Published: May 2006

The title compound, C9H10BrNO3, which exists as the E isomer, crystallizes with two independent molecules in the asymmetric unit. The bond lengths and angles in both molecules are normal. The crystal packing is stabilized by intermolecular O—H...O hydrogen bonds, which link the molecules into circular tetramers, and by weak π–π stacking interactions.
N-Methyl-N-cis-styrylcinnamamide monohydrate, a compound of Clausenaminade from Clausena lansium (Lour.) Skeels
Authors: Huang Xue-Song , Ou Shi-Yi , Tang Shu-Ze
Published: May 2006

The anhydrous form of the title compound, C18H17NO·H2O, was isolated from the dried seed of Clausena lansium (Lour.) Skeels. The liquid anhydrous form absorbs water from humid air to form crystals of the title compound. In the crystal structure, the conformations of the styryl and cinnamamide groups are E and Z, respectively. The uncoordinated water molecules are hydrogen bonded to the organic molecules.
N,6-Dimethyl-4-(methylsulfanyl)-3-nitro-4H-chromen-2-amine
Authors: Gayathri D. , Velmurugan D. , Ravikumar K. , Geetha K. , Surya Prakash Rao H.
Published: May 2006

In the title compound, C12H14N2O3S, the pyran ring adopts an envelope conformation. An N—H...O hydrogen bond generates an S(6) ring motif and intermolecular C—H...O interactions generate a centrosymmetric R
2
2(14) dimer.
2-(4-Chlorophenyl)-5-methyl-1H-pyrazol-3(2H)-one
Authors: Duan Xue-Min , Fan Mei-Lian , Zheng Peng-Wu , Li Jiang-Sheng , Huang Peng-Mian
Published: May 2006

In the title compound, C10H9ClN2O, the benzene ring is twisted with respect to the pyrazole plane, with a dihedral angle of 15.81 (11)°. The centroid-to-centroid separation of 3.721 (4) Å indicates π–π stacking between parallel benzene rings.
10,10′-Dinitro-10,10′-(propane-1,3-diyl)di-10H-anthracen-9-one
Authors: Arslan Mustafa , Asker Erol , Masnovi John , Baker Ronald J.
Published: May 2006

The title compound, C31H22N2O6, was obtained as the decomposition product of (E,E)-1,3-bis[9,10-dihydro-9-nitro-10-(trinitromethyl)-9-anthryl]propane, which was synthesized via a photochemical reaction of 1,3-di-9-anthrylpropane with tetranitromethane. Intermolecular C—H...O interactions are the most prominent features of the crystal packing; no indications of any intermolecular π–π stacking were found.
Di-μ2-chloro-1:2κ2
Cl,3:4κ2
Cl-chloro-4κCl-(6-chloropyridine-3-carboxylato-1κ2
O,O′)octamethyl-1κ2
C,2κ2
C,3κ2
C,4κ2
C-di-μ3-oxo-1:2:3κ3
O,2:3:4κ3
O-tetratin(IV) diethyl ether solvate
Authors: Li Fa-Hui , Yin Han-Dong , Sun Li , Zhao Qiang , Liu Wen-Li
Published: May 2006

In the title compound, [Sn4(CH3)8(C6H3ClNO2)Cl3O2]·C4H10O, Cl and O atoms bridge the Sn species, resulting in a cluster containing four metal atoms. Three of the four Sn coordination polyhedra are trigonal bipyramids; the other is irregular six-coordinate. Long Sn...O and Sn...N interactions result in the formation of a sheet structure.
2-{4-[2-(2,5-Dimethyl-3-thienyl)-3,3,4,4,5,5-hexafluorocyclopent-1-enyl]-5-methyl-2-thienylmethylene}propanedinitrile: a new photochromic diarylethene compound
Authors: Pu Shou-Zhi , Yang Tian-She , Wang Ru-Ji , Liu Gang , Xu Jing-Kun
Published: May 2006

The title compound, C20H12F6N2S2, is a new asymmetric photochromic diarylethene which contains 3-thienyl substituents. The distance between the two reactive C atoms in the molecule is 3.677 (8) Å. The dihedral angles between the central cyclopentene ring and the two thiophene rings are 47.6 (2) and 49.2 (2)°.
(E)-3-(3-Phenylpropoxy)but-2-enoic acid
Authors: Li Jing
Published: May 2006

In the title compound, C13H16O3, molecules related by a centre of symmetry are linked by O—H...O hydrogen bonds between the carboxyl groups to form a dimer. The propoxy chain is disordered, with an occupancy ratio of 0.69 (1):0.31 (1) between two components with roughly enantiomorphic configurations.
1,4-Bis(3,4-dicyanophenoxy)-2-butyne
Authors: Köysal Yavuz , Ağar Ayşen , Akdemir Nesuhi , Işık Şamil
Published: May 2006

In the crystal structure of the title compound, C20H10N4O2, the molecule is arranged around a twofold axis passing through the mid-point of the C[triple-bond]C triple bond. The dicyanophenoxy group is planar. The molecule is stabilized by intermolecular C—H...N hydrogen bonding.
2-Hydroxy-2′,4,4′-trimethoxybenzophenone
Authors: Qiu Lin , Wang Li , Zhao Yong-Mei
Published: May 2006

In the crystal structure, the title compound, C16H16O5, forms an intramolecular O—H...O hydrogen bond and two short intermolecular C—H...O contacts.
3,10-C-meso-2,5,5,7,9,12,12,14-Octamethyl-1,8-diaza-4,11-diazoniacyclotetradecane bis(thiocyanate)
Authors: Benson Ronald E. , Roy Tapashi G. , Hazari Saroj K. S. , Barua Kanak K. , Tiekink Edward R. T.
Published: May 2006

The title compound, C18H42N4
2+·2CNS−, contains diprotonated cations located about centres of inversion, with charge balance provided by thiocyanate anions. Intermolecular N—H...N and N—H...S hydrogen bonds are formed in the crystal structure, which comprises columns of macrocyclic cations that define channels in which the thiocyanate anions reside.
Bis(1-butyl-4-methylpyridinium) tetrachloropalladate(II)
Authors: Zawartka Wojciech , Gniewek Andrzej , Trzeciak Anna M. , Drzewiński Łukasz , Lis Tadeusz
Published: May 2006

The title compound, (C10H16N)2[PdCl4], has been crystallized from acetonitrile. The asymmetric unit contains two 1-butyl-4-methylpyridinium cations in general positions and two halves of tetrachloropalladate(II) anions, with the metal atoms lying on inversion centers. The Pd atoms are four-coordinated in a slightly distorted square-planar geometry. The crystal structure is stabilized by numerous weak C—H...Cl interactions.
4-(1,1-Dimethylprop-2-enyl)-1,3,5,6-tetrahydroxy-2-(3-methylbut-2-enyl)-9H-xanthen-9-one monohydrate
Authors: Boonnak Nawong , Chantrapromma Suchada , Fun Hoong-Kun
Published: May 2006

The title compound, C23H24O6·H2O, a xanthone compound, was isolated from Cratoxylum formosum ssp. pruniflorum. The three rings in the molecule are coplanar. The 3-methylbut-2-enyl and 1,1-dimethylprop-2-enyl side chains are axially attached to the benzene ring. There are intra- and intermolecular O—H...O and C—H...O interactions. The crystal structure is stabilized by these intermolecular interactions as well by C—H...π interactions.
[N,N′-Bis(diphenylphosphino)pyridine-2,6-diamine-κ3
P,N
1,P′]chloropalladium(II) chloride monohydrate 1,2-dichloroethane solvate
Authors: Wiedermann Julia , Benito-Garagorri David , Kirchner Karl , Mereiter Kurt
Published: May 2006

The title compound, [PdCl(C29H25N3P2)]Cl·H2O·C2H4Cl2, contains a cationic pincer-type PNP complex with Pd in a square-planar coordination. The complexes form dimers which are π–π stacked via their pyridine rings and linked into chains via hydrogen bonds via four-membered rings of two chloride anions and two water molecules. Pairs of 1,2-dichloroethane molecules are entrapped in pockets of the structure and show weak interactions with palladium.
N,N′-Octamethylenebis(4-methylbenzamide)
Authors: Awaleh Mohamed Osman , Badia Antonnella , Brisse François
Published: May 2006

In the title structure, C24H32N2O2, the molecule lies on a crystallographic inversion centre at the mid-point of the central C—C bond. The planar OCN—(CH2)
n
—NCO segment is in an all-trans configuration. The NH group of the amide group is involved in a single hydrogen bond to the O atom of a symmetry-related molecule to form one-dimensional ribbons parallel to the b direction.
1-(3-Nitrophenyl)-5-tosylperhydropyrrolo[3,4-b]pyrrole
Authors: Gayathri D. , Sujatha D. , Velmurugan D. , Ravikumar K. , Poornachandran M.
Published: May 2006

In the title compound, C19H21N3O4S, one of the pyrrolidine rings adopt a half-chair conformation, while the other is in an envelope conformation. The molecules are linked into C(9) chains by C—H...O hydrogen bonds.
Methyl (E,E)-{2-[({[1,3-dimethyl-5-(2-fluorophenoxy)-1H-pyrazol-4-ylmethylene]amino}oxy)methyl]phenyl}-2-(methoxyimino)acetate
Authors: Li Yan , Yang Xiang-Ping , Zhang Hong-Quan , Meng Xiang-Gao , Liu Zhao-Jie
Published: May 2006

The molecule of the title compound, C23H23FN4O5, assumes an overall U-shaped conformation and exhibits orientational disorder. The crystal packing is stabilized by intra- and intermolecular C—H...O hydrogen bonds.
A 1:1 molecular complex of dicyclohexylamine and cyclohexanone oxime
Authors: Chetina Olga V. , Yufit Dmitry S. , Howard Judith A. K.
Published: May 2006

The molecules of the title complex, C12H23N·C6H11N, are linked together in chains by O—H...N and N—H...O hydrogen bonds.
5,15-Bis(p-methylphenyl)-2,8,12,18-tetrabutyl-3,7,13,17-tetramethylporphyrin
Authors: Boyd Peter D.W. , Hosseini Ali
Published: May 2006

The centrosymmetric title compound, C54H66N4, is a 5,15 diaryloctaalkyl free base porphyrin. The planar 24-atom porphyrin core has a significant in-plane distortion commonly observed in these types of molecules along the 5,15 direction. The porphyrin molecules are arranged in the crystal structure in two-dimensional assemblies via phenyl-edge-to-porphyrin-face interactions.
3-(4-Chloroanilino)isobenzofuran-1(3H)-one
Authors: Büyükgüngör Orhan , Odabaşoğlu Mustafa
Published: May 2006

The structure of the title compound, C14H10ClNO2, is stabilized by N—H...O, C—H...π and π–π interactions. The phthalide part of the molecule is planar and the dihedral angle between the phthalide group and the benzene ring is 75.58 (15)°.
μ-Oxo-bis[trans-dichloro(2,4,6-tri-2-pyridyl-1,3,5-triazine)iron(III)] dihydrate
Authors: Zibaseresht Ramin , Robinson Ward T. , Hartshorn Richard M.
Published: May 2006

Two iron complexes of the tridentate ligand 2,4,6-tri-2-pyridyl-1,3,5-triazine (tpt, C18H12N6) have been isolated and characterized. One is [FeII(tpt)2]Cl2·4H2O, (II), and the other is the title dinuclear complex, [FeIII
2Cl4(μ-O)(tpt)]·2H2O, (III), which has been crystallographically characterized. The coordination sphere around each Fe atom is a distorted octahedron formed by three N atoms from the tridentate site of one tpt ligand, coordinated in a meridional fashion, two Cl− ions cis to the central donor of the tpt ligand, and an oxo bridging ligand trans to the tpt ligand. The Fe—N distances are in the range 2.124 (2)–2.202 (3) Å, the Fe—O—Fe angle is 176.13 (14)° and the Fe...Fe separation is 3.536 (2) Å.
An ent-kaurane diterpenoid from Isodon japonica
Authors: He Zhi-An , Zhang Ji-Xia , Bai Su-Ping
Published: May 2006

The title compound, 1β,7β-dihydroxy-6β,15β-diacetoxy-16α,17:7α,20-diepoxy-ent-kaurane or Maoyecrystal B, C24H34O8·H2O, crystallizes with one molecule of water of crystallization. It is a natural diterpenoid composed of four fused rings with the expected cis and trans junctions. Molecules are linked together by O—H...O hydrogen bonds.
trans-Bromocarbonylbis(triphenylphosphine)rhodium
Authors: Steyl Gideon , Kirsten Leo , Muller Alfred , Roodt Andreas
Published: May 2006

The title compound, [RhBr(C18H15P)2(CO)], can be characterized as a rhodium(I) Vaska-type compound based only on the spectroscopic [νKBr(CO), 31P] data. A low-temperature X-ray crystallographic analysis shows that the compound possesses a crystallographically imposed centre of symmetry with a statistically disordered Br atom and CO group. The essentially different occupancies for the Br atom and the CO group [0.283 (2) and 0.717 (2), respectively] suggest that the compound exists as a mixture of rhodium(0), rhodium(I) and rhodium(II) complexes.
{2,4-Dibromo-6-[2-(dimethylamino)ethyliminomethyl]phenolato}thiocyanatonickel(II)
Authors: Sun Xin-Zhi , Shi Jin-Sheng
Published: May 2006

The title compound, [Ni(C11H13Br2N2O)(NCS)], is a mononuclear nickel(II) compound. The square-planar geometry of the NiII atom is provided by one O and two N atoms of the tridentate ligand and one N atom of the thiocyanate anion.
Poly[[diaqua-μ-1,2-benzene-1,2-dicarboxylato-μ-4,4′-bipyridine-copper(II)] dihydrate]: a two-dimensional copper(II) polymer
Authors: Xu Han , Sun Ran , Li Yi-Zhi , Bai Jun-Feng
Published: May 2006

The title compound, {[Cu(C8H4O4)(C10H8N2)(H2O)2]·2H2O}
n
, contains chains of copper(II) centres bridged by bipyridine ligands along the b axis. The chains are bridged by phthalate dianions, forming a rectangular grid complex. Each CuII atom adopts a slightly distorted octahedral geometry, being coordinated by two N atoms of 4,4′-bipyridine, two O atoms of phthalate dianions and two water molecules. Twofold axes are located along the copper–bipyridine chains and through the phthalate dianions.
Bis{1-[3-(cyclohexylamino)propyliminomethyl]naphth-2-olato}cobalt(II) tetrahydrate
Authors: You Zhong-Lu
Published: May 2006

In the title centrosymmetric mononuclear cobalt(II) complex, [Co(C20H25N2O)2]·4H2O, the CoII atom is six-coordinated by two O and four N atoms from the two Schiff base ligands, forming a very slightly disorted octahedral coordination.
5-Bromo-2-(hydroxymethyl)pyridine
Authors: Wu Ya-Ming , Dong Chang-Chuan , Liu Shan , Zhu Hong-Jun , Wu Yi-Zu
Published: May 2006

The molecule of the title compound, C6H6BrNO, is essentially planar. Intermolecular O—H...Br hydrogen bonds link the molecules into a chain along [101].
(Z)-5-Chlorofuran-2-carbaldehyde oxime
Authors: Wang Xi-Zhao , Jia Jiong , Zhang Yan , Wang Jian-Wu
Published: May 2006

The molecule of the title compound, C5H4ClNO2, is essentially planar, with normal values for the bond lengths and angles. In the crystal structure, intermolecular O—H...N hydrogen bonds link the molecules into zigzag chains extending along the b axis.
Solid Freeform Fabrication of Thin‐Walled Ceramic Structures Using an Electrohydrodynamic Jet
Authors: Wang D. Z. , Edirisinghe M. J. , Jayasinghe S. N.
Published: May 2006

A printing device, which operates on an electrohydrodynamic principle, was used to deposit 100 layers of a 10 vol% zirconia suspension. Thus, a wall ∼100 μm in thickness was freeformed. The wall thickness achieved in this work is almost 30% less than that of similar structures built by ink‐jet printing and therefore we demonstrate a novel print deposition based solid freeform fabrication method, which can be developed further for preparing fine ceramic structures.
Diagnosis of thymoma
Authors: Suster S
Published: May 2006

The diagnosis of thymic epithelial neoplasm has been a topic of controversy for many years. Reasons for this include the lack of predictive value associated with the morphology of these tumours and the multiplicity of classification schemes and terminologies proposed over the years. Recently, a new classification schema was introduced by the World Health Organization (WHO) in an attempt to standardise nomenclature and facilitate the diagnosis of primary thymic epithelial neoplasms. This schema, although not originally intended as a new histological classification, but rather as a means for translating equivalent terms from the various existing classifications, has represented a major step forward in this direction. However, problems still exist with the WHO schema, particularly with some of the criteria for the various histological subtypes as well as with issues of interobserver reproducibility. For this reason, we favour using a much more simplified approach to the morphological classification of thymic epithelial neoplasms. A personal approach to the morphological diagnosis of thymoma is described, with a brief explanation for the rationale for simplifying the existing diagnostic categories.
An approach to duodenal biopsies
Authors: Serra S , Jani P A
Published: May 2006

The introduction of endoscopy of the upper digestive tract as a routine diagnostic procedure has increased the number of duodenal biopsy specimens. Consequently, the pathologist is often asked to evaluate them. In this review, a practical approach to the evaluation of a duodenal biopsy specimen is discussed. An overview of the handling of specimens is given and the normal histology and commonly encountered diseases are discussed. Finally, a description of commonly seen infections is provided, together with an algorithmic approach for diagnosis.
Myocardial dysfunction and neurohumoral activation without remodeling in left ventricle of monocrotaline-induced pulmonary hypertensive rats
Authors: Lourenço André P. , Roncon-Albuquerque Roberto , Brás-Silva Carmen , Faria Bernardo , Wieland Joris , Henriques-Coelho Tiago , Correia-Pinto Jorge , Leite-Moreira Adelino F.
Published: May 2006

In monocrotaline (MCT)-induced pulmonary hypertension (PH), only the right ventricle (RV) endures overload, but both ventricles are exposed to enhanced neuroendocrine stimulation. To assess whether in long-standing PH the left ventricular (LV) myocardium molecular/contractile phenotype can be disturbed, we evaluated myocardial function, histology, and gene expression of autocrine/paracrine systems in rats with severe PH 6 wk after subcutaneous injection of 60 mg/kg MCT. The overloaded RV underwent myocardial hypertrophy ( P < 0.001) and fibrosis ( P = 0.014) as well as increased expression of angiotensin-converting enzyme (ACE) (8-fold; P < 0.001), endothelin-1 (ET-1) (6-fold; P < 0.001), and type B natriuretic peptide (BNP) (15-fold; P < 0.001). Despite the similar upregulation of ET-1 (8-fold; P < 0.001) and overexpression of ACE (4-fold; P < 0.001) without BNP elevation, the nonoverloaded LV myocardium was neither hypertrophic nor fibrotic. LV indexes of contractility ( P < 0.001) and relaxation ( P = 0.03) were abnormal, however, and LV muscle strips from MCT-treated compared with sham rats presented negative ( P = 0.003) force-frequency relationships (FFR). Despite higher ET-1 production, BQ-123 (ETAantagonist) did not alter LV MCT-treated muscle strip contractility distinctly ( P = 0.005) from the negative inotropic effect exerted on shams. Chronic daily therapy with 250 mg/kg bosentan (dual endothelin receptor antagonist) after MCT injection not only attenuated RV hypertrophy and local neuroendocrine activation but also completely reverted FFR of LV muscle strips to positive values. In conclusion, the LV myocardium is altered in advanced MCT-induced PH, undergoing neuroendocrine activation and contractile dysfunction in the absence of hypertrophy or fibrosis. Neuroendocrine mediators, particularly ET-1, may participate in this functional deterioration.
New Methods in Due-Process Cases
Authors: Kales Albert M.
Published: May 2006

In addressing the court in due-process cases one should not commence with the usual salutation “May it please the Court.” Instead, one should say “My Lords.” Backed by and charged with the enforcement of the due-process clause of the fifth and fourteenth amendments, the Supreme Court of the United States is the American substitute for the British house of lords. It constitutes the real and only conservative second chamber of the federal government. It is a second conservative chamber for each of the state governments.

The time has come when the political scientists of the country should recognize, in the decisions of the United States Supreme Court under the due-process clause, the functioning of a second chamber, organized to defeat the popular will as expressed in legislation when that will appears to endanger what the court may regard as a fundamental requirement of the social structure itself.

Like all conservative second chambers, the Supreme Court and the due-process clause are in a hopeless dilemma. If the popular will were frustrated as often as the dissenting opinions of Mr. Justice McReynolds indicate that it should be, the second chamber function of the court would be assailed by the recall of judicial decisions. If the court bowed to the popular will as often as the dissenting opinions of Mr. Justice Holmes indicate that it should, the second chamber function of the court would cease to be exercised.
Political Geography and State Government
Authors: Dodd W. F.
Published: May 2006

Little attention has been devoted in this country to political areas and their relationship to each other. Not much is to be gained from a theoretical discussion of this subject, and this article is based upon a detailed study of conditions in Illinois. Similar problems present themselves in every state, although the details vary in different parts of the country, and the effort is made here to bring out the general issues involved, using the conditions in a single state as the basis for discussion.

Attention should at the outset be called to the fact that the situation is complicated by the fact that this state has but one great city. The position of Chicago and Cook County constitutes one of the serious political problems in connection with reorganization of state and local government.
The Development of Democracy on the American Continent
Authors: Rowe L. S.
Published: May 2006

The year that is about to close marks the hundredth anniversary of the independence of many of the republics of the American continent. The long struggle which began in 1808, and which did not reach full fruition until the beginning of the third decade of the nineteenth century, possesses all the characteristics of a great epic; marked by a degree of devotion to the ideals of liberty and independence which will ever constitute the great heritage of the people of this continent.

Within these last twelve months we have also seen the republican system of government fully organized in some of the older monarchies of Europe and in the new and independent states established by the Treaty of Versailles. The period that has elapsed is much too short to permit of any adequate estimate of the permanence of the political systems that have been established, or of the manner of their operation. On the other hand, the development of democracy in the republics of America has extended over a period sufficiently long to make possible an inventory of its strength and weakness and some formulation of the requisites for further progress.
The Monroe Doctrine and the Government of Chile
Authors: Castro-Ruiz Carlos
Published: May 2006

The Monroe Doctrine has been the subject of much discussion by American and European publicists, and their estimates have been widely different, ranging from those who consider it the principle which has maintained the territorial integrity of this continent for nearly a century to those who deny to it any real influence in the preservation of the nations which emerged into independent life during the first quarter of the nineteenth century. Both concepts are, in my judgment, exaggerated. To accept the first judgment would be to ignore and to forget the failure of the United States to assert the doctrine on three different occasions when it was flagrantly violated: the occupation of the Falkland Islands by Great Britain in 1843, islands which were regarded by the Argentine Republic as national property; the military intervention of France in the Republics of the River Platte in 1838, an intervention repeated in conjunction with Great Britain in 1845; and the occupation of the Chincha Islands by Spain in 1865. The attitude of the government of the United States is readily explained when one recalls the fact that the Monroe Doctrine had not become a real factor in world politics until the naval and military strength of the United States had given to that country the position of a great power. Before that time the doctrine was nothing more than a happy formulation of an aspiration deeply felt by the American nations which had on several occasions prior to the celebrated message of 1823 proclaimed the same idea.
Swiss Initiative Vote of December 3, 1922
Authors: Brooks Robert C.
Published: May 2006

On September 13, 1921, the Swiss Social-Democratic party filed an initiative petition for an amendment to the consitution, signed by 87,535 citizens, the required number being 50,000. The amendment thus proposed provided for the levy of a tax or special assessment upon property holdings in excess of 80,000 francs, the rates on personal holdings rising from 8 per cent upon the first 50,000 francs to 60 per cent upon amounts over 3,000,000 francs. Cantons and communes were to receive each 20 per cent of the amount yielded by the tax within their borders, the remaining 60 per cent going to the federation. The purpose of the tax, as officially stated, was to enable the public authorities to meet the obligations imposed by their social policies, particularly in such matters as old age, invalidity, and other forms of social insurance.
American Publicity in Italy
Authors: Merriam Charles E.
Published: May 2006

The great war developed many new weapons—the submarine, the aeroplane, the long range gun, the tank, the deadly gas; but one of the most novel and deadly was the propaganda—the psychological working on the war will of the enemy. It was developed first and effectually used by the Central Powers against France, England, the United States, and with terrible results in Russia and Italy. But the Allies were not far behind, and by the close of the war had caught up with their foes and probably surpassed them. In the summer of 1918, the German press complained of the relative weakness of their propaganda, and declared the enemy's pen and propaganda were worse than his sword.

After the work of the Committee on Public Information, under Mr. George Creel, had been under way for a number of months in the United States, it was deemed advisable to establish branch offices of the committee in many European countries for the purpose of explaining the war aims and preparations of our country. Such offices were established in England, France, Italy, and eventually in some thirty-two foreign countries, in charge of Mr. Will Irwin and later of Mr. Edward Lisson. For the purpose of organizing the work in Italy, the writer was sent over by the committee, arriving in Rome about March, 1918, and returning in October.
Danish Parliamentary Elections of 1918
Authors: Saby R. S.
Published: May 2006

Denmark enacted new election laws May 10, 1915. The first election of members of the lower house of the national legislature held under them, April 22, 1918, is of special interest; for the laws attempt in a unique way to remedy the inequalities in representation common under the singlemember district plan.
Changes of Bureau Chiefs in the National Administration of the United States, 1926–29
Authors: Macmahon Arthur W.
Published: May 2006

It is the purpose of this note to bring down to date an analysis of the selection and tenure of bureau chiefs in the national administration offered by the writer in this Review in 1926. A complete enumeration of the changes that have taken place at this crucial level in the civil service during an interval of nearly three years has suggestive value, at least in indicating the trend of our bureaucracy.

The mode of approach in the original study was primarily biographical. The bureaus were classified with reference to the manner of selection and the nature of the prior experience of the bureau chiefs then in office. The same method and arrangement are used in dealing with shifts since 1926.

First to be considered are the new bureau chiefs whose positions are in the classified competitive service under the supervision of the Civil Service Commission. Replacements in this group since 1926 have involved the amalgamated Bureau of Chemistry and Soils, the Bureau of Dairy Industry, the Bureau of Agricultural Economics, the Bureau of Biological Survey, the Forest Service, the Bureau of Entomology, and indirectly the newly constituted Food, Drug, and Insecticide Administration and the Plant Quarantine and Control Administration—all in the Department of Agriculture; also the National Park Service in the Department of the Interior. In two instances competitive examinations have been employed; in another, one has been ordered; in the remaining cases the new chiefs have been chosen by promotion from within the competitive classified service.
American Interpretations of Natural Law
Authors: Wright B. F.
Published: May 2006

When James Otis in 1764 declared that government “has an everlasting foundation in the unchangeable will of God, the author of nature, whose laws never vary,” and that “there can be no prescription old enough to supersede the law of nature and the grant of God Almighty, who has given to all men a natural right to be free,” he was at once making use of one of the oldest and most important conceptions in the history of political thought and giving to that concept a distinctly American meaning. His was merely one of the earliest examples in this country of a kind of political theory which was to find reflection in the Declaration of Independence in one generation, in the higher law doctrine in another, and in a famous trilogy of decisions of the Supreme Court in still a third. However, the natural-rights theory is by no means the only usage found for the natural-law concept in the political thought of this country, and it is the purpose of this paper to trace briefly the various interpretations placed upon it and the different forms through which it has passed.

It is easy enough to say that natural law has meant just what the individual theorist desired to have it mean; for its content has varied from philosophical anarchy to paternalistic aristocracy, and from the assertion of strongly individualistic democracy to the defence of highly centralized government. But this statement does not dispose of the problem. It is necessary to know why and when these varying interpretations were advanced and what their exponents meant when they spoke so confidently of the laws of nature.