bluuebunny/crossref_metadata_2025_split huggingface dataset:
Kinetics of β‐funaltrexamine binding to wild‐type and mutant μ‐opioid receptors expressed in Chinese hamster ovary cells
Authors: Spivak Charles E. , Beglan Carol L. 
Published: March 2004

AbstractThe two‐stage reaction whereby the antagonist β‐funaltrexamine (β‐FNA) binds covalently to μ opioid receptors makes it a highly discriminating probe into the tertiary structure of the receptor's recognition pocket. To obtain a quantitative measure of how well this pocket is preserved in a mutated form of the receptor, in which His‐297 is substituted with glutamine, we employed [3H]‐β‐FNA to evaluate the kinetic rate constants for both the reversible as well as the irreversible stages of its binding to wild‐type and mutant H297Q μ receptors stably expressed in Chinese hamster ovary cells. The expression levels of the wild‐type and mutant H297Q receptors were matched by exploiting the variation in receptor density as a function of plating day and by raising the expression level by pretreatment with naloxone. We found that all of the kinetic rate constants for [3H]‐β‐FNA were diminished by about one‐half at the mutant H297Q μ receptors with respect to wild‐type receptors. By comparison, the association rate constant of [3H]‐naloxone likewise decreased by one‐half; however, the dissociation rate constant increased 5‐fold at the mutant H297Q receptor. We conclude that the mutation has had only minor influence on the recognition site and that the function of position 297 is more likely as a link in the transduction chain. Synapse 52:123–135, 2004. Published 2004 Wiley‐Liss, Inc.
Prefrontal cortical up states are synchronized with ventral tegmental area activity
Authors: Peters Yvette , Barnhardt Nicole E. , O'Donnell Patricio 
Published: March 2004

AbstractThe innervation of the prefrontal cortex (PFC) by the ventral tegmental area (VTA) has an important role in incentive‐motivation and cognitive functions. Although this projection has been extensively studied, the precise actions of its transmitters, dopamine (DA) and GABA, on PFC pyramidal neurons remain to be determined. We have recently shown that VTA stimulation elicits a sustained depolarization in PFC pyramidal neurons resembling the periodic depolarizations (up states) these neurons exhibit. This response was shortened by a D1 antagonist, suggesting that DA may sustain depolarized up states in PFC neurons. Here, we tested whether spontaneous PFC up states in vivo require spontaneous VTA activity. Intracellular recordings from PFC neurons conducted simultaneously with VTA local field potentials (LFPs) revealed PFC membrane potential fluctuations occurring synchronously with VTA field potential transitions. Extracellular PFC recordings performed simultaneously with VTA LFPs also indicated a high coherence between these two regions, with VTA oscillations trailing PFC oscillations by a few milliseconds. Furthermore, blockade of VTA activity with lidocaine transiently eliminated PFC LFPs, but not PFC cell up states; instead, up states became irregular during intra‐VTA lidocaine administration. These results suggest that baseline levels of VTA activity are necessary for synchronizing PFC pyramidal neurons in the up–down oscillations observed in the anesthetized preparation, allowing the emergence of slow EEG components. Synapse 52:143–152, 2004. © 2004 Wiley‐Liss, Inc.
Effect of acute antipsychotic administration on dopamine synthesis in rodents and human subjects using 6‐[18F]‐L‐m‐tyrosine
Authors: Mamo David , Remington Gary , Nobrega Jose , Hussey Doug , Chirakal Raman , Wilson Alan A. , Baker Glen , Houle Sylvain , Kapur Shitij 
Published: March 2004

AbstractClinical effects of antipsychotic drugs are thought to be mediated primarily through antagonism of the dopamine D2 receptors. Recent studies have demonstrated increased aromatic decarboxylase activity following acute administration of dopamine D2 receptor antagonists both in vivo and ex vivo. However, this effect has never been demonstrated in human subjects. We studied the effect of acute antipsychotic administration on dopamine synthesis in rodents and healthy human subjects using 6‐[18F]‐L‐m‐tyrosine. In rats, we studied the effect of a single subcutaneous injection of haloperidol and risperidone on dopamine synthesis using 6‐[18F]‐L‐m‐tyrosine. In our human study, six healthy volunteers underwent two 6‐[18F]‐L‐m‐tyrosine PET scans, before and after 3 mg risperidone to measure the rate of accumulation of radioactivity in the striatum as an index of dopamine synthesis. The striatal/cerebellar radioactivity count ratio and the ratio of dopamine metabolites to dopamine concentration was significantly higher in all rodent treatment groups compared to controls. In the PET study we found no significant change in the rate of uptake in the striatum. Our results suggest that 6‐[18F]‐L‐m‐tyrosine PET may not be a useful tool in the study of the effect of antipsychotics on dopamine synthesis in human subjects. Synapse 52:153–162, 2004. © 2004 Wiley‐Liss, Inc.
Synthesis and Crystal Structure of Pb3O2(SeO3)
Authors: Krivovichev Sergey V. , Avdontseva Evgeniya Yu. , Burns Peter C. 
Published: March 2004

AbstractSingle crystals of Pb3O2(SeO3) have been prepared hydrothermally at 230 °C. The structure (orthorhombic, Cmc21, a = 10.529(2), b = 10.722(2), c = 5.7527(12)Å, V = 649.5(2)Å3) has been solved by direct methods and refined to R1 = 0.059 on the basis of 615 unique observed reflections (|Fo| = 4σF). The structure is based upon double [O2Pb3]2+ chains of edge‐sharing [OPb4]6+ tetrahedra. These [O2Pb3]2+ chains run parallel to [001], and their planes are parallel to (010). The pyramidal (SeO3)2— anions are located between the chains; their triangular oxygen atom bases lie parallel to (001) and all (SeO3)2— groups are pointing in the same direction. A short compilation of [O2M3] chains of oxocentred M4 tetrahedra in minerals and inorganic compounds is provided.
Trinuclear Phosphaferroles from Alkylidyne‐Phosphaalkyne Coupling Reactions
Authors: Lentz Dieter , Michael‐Schulz Heike , Reuter Marion 
Published: March 2004

AbstractReaction of bisalkylidyne cluster compounds [Fe3(CO)9(μ3‐CR)2] (1a—d) (a, R = H; b, R = F; c, R = Cl; d, R = Br) with the phosphaalkyne t‐C4H9‐C≡P (2) yield a single isomer of the phosphaferrole cluster [Fe3(CO)8][CR‐C(t‐Bu)‐P‐CR] (3a—d). However, the three isomeric compounds [Fe3(CO)8][C(OEt)‐C(t‐Bu)‐P‐C(Me)] (5a), [Fe3(CO)8][C(Me)‐C(t‐Bu)‐P‐C(OEt)] (5b), and [Fe3(CO)8][C(OEt)‐C(Me)‐C(t‐Bu)‐P] (5c) are obtained in the reaction of [Fe3(CO)9(μ3‐CMe)(μ3‐C‐OEt)] (4) with 2. As the phosphaferroles 3 possess a lone pair of electrons at the phosphorus atom they can act as ligands. [Fe3(CO)8][CF‐C(t‐Bu)‐P‐CF]MLn (7a—c) (a, MLn = Cr(CO)5; b, MLn = CpMn(CO)2; c, MLn = Cp*Mn(CO)2) were formed from 3b and LnM(η2‐C8H14) (6a—c). The dinuclear cluster [Fe2(CO)6][CF‐CF‐C(t‐Bu)‐PH(OMe)] (8) was obtained from 3b and NiCl2·6H2O in methanol. The structures of 3a—d, 5a—c, 7b, and 8 have been elucidated by X‐ray crystal structure determinations.
Strukturen von Bis(trifluormethyl)halogeno‐ und ‐thiocyanato‐mercuraten, [Hg(CF3)2X]— (X = Br, I, SCN), und ein Vergleich der Strukturparameter der CF3‐Gruppen
Authors: Naumann Dieter , Schulz Frank , Pantenburg Ingo , Tyrra Wieland 
Published: March 2004

Abstract[(18‐C‐6)K]2[Hg(CF3)2SCN]2 (1) und [P(CH3)(C6H5)3]2[Hg(CF3)2X]2 (X = Br (2), I (3)) werden synthetisiert und deren Kristallstrukturen bestimmt. [(18‐C‐6)K]2[Hg(CF3)2SCN]2 (1) kristallisiert in der monoklinen Raumgruppe P21/c mit Z = 2, [P(CH3)(C6H5)3]2[Hg(CF3)2Br]2 (2) in der monoklinen Raumgruppe P21/n mit Z = 2 und [P(CH3)(C6H5)3]2[Hg(CF3)2I]2 (3) in der triklinen Raumgruppe P1¯ mit Z = 1. Alle drei Verbindungen bilden in den Festkörpern dimere über Br, I bzw. SCN verbrückte Anionen mit planaren Hg2X2‐ Ringen.Die Strukturparameter der Hg(CF3)2‐Gruppen in den bisher bekannten Bis(trifluormethyl)halogenomercuraten werden verglichen. Es liegt jeweils eine nahezu symmetrische und eine verzerrte CF3‐Gruppe vor. Die größte Differenz in den C—F‐Bindungslängen wird in [(18‐C‐6)K][Hg(CF3)2I] gefunden. Dies kann als experimenteller Beweis für die Eigenschaft von Trifluormethylquecksilber‐Verbindungen gedeutet werden, in Gegenwart von Alkalimetalliodiden als exzellente Difluorcarbenquelle zu wirken.
Monomeric Magnesium and Calcium Complexes containing the Rigid, Dianionic 1, 2‐Bis[(2, 5‐di‐tert‐butylphenyl)imino]acenaphthene (dtb‐BIAN) and 1, 2‐Bis[(2‐biphenyl)imino]acenaphthene (bph‐BIAN) Ligands
Authors: Fedushkin Igor L. , Chudakova Valentina A. , Skatova Alexandra A. , Khvoinova Natalie M. , Kurskii Yuri A. , Glukhova Tatyana A. , Fukin Georgy K. , Dechert Sebastian , Hummert Markus , Schumann Herbert 
Published: March 2004

AbstractThe new rigid bidentate nitrogen ligands 1, 2‐bis[(2, 5‐di‐tert‐butylphenyl)imino]acenaphthene (1) (dtb‐BIAN) and 1, 2‐bis[(2‐biphenyl)imino]acenaphthene (2) (bph‐BIAN) have been synthesized by condensation of 1, 2‐acenaphthylenedione with 2, 5‐di‐tert‐butylaniline and 2‐aminobiphenyl, respectively. Reduction of 1 and 2 with magnesium and calcium results in the formation of the monomeric metal complexes [(dtb‐BIAN)Mg(THF)2] (3), [(bph‐BIAN)Mg(DME)2] (4), and [(bph‐BIAN)Ca(THF)3] (5). Compounds 1 — 5 have been characterized by C/H analyses, IR, 1H NMR, and 13C NMR spectra, the structures of 2, 3, and 5 have been estimated by single crystal X‐ray diffraction.
Hydrothermal Stability of the Novel Zeolite Type LSX in Comparison to the Traditional 13X Modification
Authors: Buhl J.‐Ch. , Gerstmann M. , Lutz W. , Ritzmann A. 
Published: March 2004

AbstractIon‐exchanged LSX (Si/Al = 1.02) and 13X (Si/Al = 1.18) zeolite series (Li, Na, K, Rb, Ca, Sr, Ba exchanged) were hydrothermally treated at temperatures between 423 K and 513 K in liquid water under autogeneous water vapour pressure. Beside X‐ray powder diffraction, the molybdate method and the water sorption uptake have been used to characterize the treated samples.The LSX and 13X zeolites show a similar hydrothermal behaviour in spite of their different framework Si/Al ratios depending only on the type of introduced cations. Significant destabilizing effects were observed especially in presence of K and Rb cations as well as the bivalent Sr and Ba cations. The LSX zeolites are hydrothermally more stable than LTA zeolites of same cations despite their same chemical framework composition.
Structure and Magnetic Properties of a Novel Two‐Dimensional Complex from 1, 3, 5‐Benzenetricarboxylate and Neodymium(III) — {[Nd(1, 3, 5‐benzenetricarboxylate)(H2O)4] · H2O}n
Authors: Wang Qing‐Lun , Liang Mao , Liao Dai‐Zheng , Yan Shi‐Ping , Jiang Zong‐Hui , Cheng Peng 
Published: March 2004

AbstractA unique neodymium(III) complex, {[Nd(BTC)(H2O)4] · H2O}n (BTC = 1, 3, 5‐benzenetricarboxylate), was obtained from the reaction between Nd(ClO4)3 · xH2O and Na3BTC. Coordination bonds, hydrogen bonds, and π‐π stacking form a supramolecular structure with a novel, two‐dimensional framework. The temperature‐dependent magnetic susceptibilities were analyzed by the Curie‐Weiss law; the following values were found C = 1.32, θ = —18.3 K, respectively.
A Gadolinium Diphenate Coordination Polymer, [Gd2(H2O)2(C14H8O4)3], with One‐dimensional Structure
Authors: Thirumurugan A. , Pati Swapan K. , Green Mark A. , Natarajan Srinivasan 
Published: March 2004

AbstractA hydrothermal reaction of Gd(NO3)3 and 2, 2′‐diphenic acid give rise to a new coordination compound [Gd2(H2O)2(C14H8O4)3] with one‐dimensional structure. Single crystal X‐ray studies shows that the compound has infinite O‐Gd‐O one‐dimensional chains resulting from a bonding between Gd3+ cations and diphenate anions. The Gd3+ ions are distorted dodecahedra with respect to oxygen atoms. Magnetic investigations show no ordering up to 4K and the compound exhibit photoluminescence at room temperature.
Die Benzonitril‐Addukte [Ho2Cl6(PhCN)6] und [HoCl3(PhCN)]: Synthese, Kristallstrukturen, FIR‐ und MIR‐Spektroskopische Untersuchungen
Authors: Quitmann Catharina C. , Müller‐Buschbaum Klaus 
Published: March 2004

AbstractSchwach rosa‐farbene, transparente Kristalle von [Ho2Cl6(PhCN)6] konnten durch Reaktion eines Gemenges aus HoCl3/AlCl3 mit Benzonitril bei 150μ °C, sowie deutlich rosa‐farbene, transparente Kristalle der Verbindung [HoCl3(PhCN)] aus der analogen Reaktion unter solvothermalen Bedingungen bei 200μ °C erhalten werden. [Ho2Cl6(PhCN)6] zeigt einen dimeren Aufbau in Gestalt zweier kantenverknüpfter pentagonaler Bipyramiden. [HoCl3(PhCN)] bildet eine Schichtstruktur aus eckenverknüpften trigonalen Cl‐Prismen um die Holmiumatome. Die PhCN Moleküle koordinieren an Ho und trennen die Schichten.
Synthesis, Characterization, and Crystal Structure of Mononuclear and Dinuclear Dioxomolybdenum(VI) Complexes with Tridentate Schiff‐base Ligands. Part 2
Authors: Cindrić Marina , Strukan Neven , Vrdoljak Višnja , Kamenar Boris 
Published: March 2004

AbstractMononuclear [MoO2LD], and dinuclear [MoO2L]2 or [MoO2L]2 · D dixomolybdenum(VI) complexes have been prepared by the reaction of tridentate Schiff‐base ligands L with [MoO2(acac)2]. The Schiff‐base ligands have been synthesized from salicylaldehyde (1, 1a, 1c, 1d), 2‐hydroxy‐1‐naphthaldehyde (2, 2c) and 2‐hydroxy‐3‐methoxybenzaldehyde (3a, 3b, 3c, 3d, 3e) with 2‐amino‐p‐cresol. All prepared complexes consist of cis‐MoO22+core coordinated by Schiff‐base ligand through two deprotonated hydroxyl groups and one imino nitrogen atom. The usual octahedral coordination around the molybdenum atoms is completed by the neutral ligand D (methanol, ethanol, dimethyl sulfoxide, imidazole or 4, 4′‐bipyridine). All compounds were characterized by elemental analyses, IR spectroscopy and some of them by X‐ray crystallography (1a, 2c, 3a, 3b, 3c and 3e).
Synthesis, Structure, and Spectroscopic Properties of Copper(II) and Nickel(II) Complexes Containing the 1, 4, 7‐Triisopropyl‐1, 4, 7‐triazacyclononane Ligand
Authors: Han Wei , Li Ling , Liu Zhan‐Quan , Yan Shi‐Ping , Liao Dai‐Zheng , Jiang Zong‐Hui , Shen Pan‐Wen 
Published: March 2004

AbstractThree new complexes [CuL(N3)2] (1), [CuL(SCN)2] (2), and [NiL(SCN)2] (3) (L = 1, 4, 7‐triisopropyl‐1, 4, 7‐triazacyclononane, [—NR—C2H4—NR—C2H4—NR—C2H4—], R = i‐Pr) have been synthesized and structurally characterized. The three complexes all crystallize in the monoclinic space group P21/n, with the unit cell parameters a = 9.100(5), b = 19.492(11), c = 11.646(6)Å, β = 94.526(9)° for 1, a = 10.148(3), b = 13.611(5), c = 15.777(6)Å, β = 95.412(6)° for 2 and a = 9.270(7), b = 16.629(14), c = 14.886(12)Å, β = 101.217(15)° for 3. The central copper(II) and nickel(II) ions are coordinated to five nitrogen atoms, three of which from the L and two from N3— or SCN—, forming a slightly distorted square pyramidal geometry. Moreover, elemental analysis, IR, UV‐vis and ESR spectra of complexes 1‐3 were also determined.
Synthesis, Crystal Structures, and Nonlinear Optical Properties of Two Cubane‐Like Cluster Compounds [(n‐Bu)4N]3[MoS4Ag3Cl4] and [Et4N]3[WOS3Cu3I4]
Authors: Zhou Jian‐Liang , Song Ying‐Lin , Li Yi‐Zhi , Zheng He‐Gen , Xin Xin‐Quan 
Published: March 2004

AbstractThe compounds [(n‐Bu)4N]3[MoS4Ag3Cl4] (1) and [Et4N]3[WOS3Cu3I4] (2) were synthesized and characterized. Compound1crystallizes in the rhombohedral system, space groupR3cwitha= 17.194(1),b= 17.194(1),c= 39.194(3)Å,Z= 6,V= 10034.7(11)Å3. Compound2crystallizes in the rhombohedral system, space groupR3cwitha= 14.461(2),b= 14.461(2),c= 34.952(2)Å,Z= 6,V= 6329.9(13)Å3. The X‐ray crystallographic structure determinations show that these two cluster compounds consist of a slightly distorted cubic core. Nonlinear optical (NLO) properties of these two clusters were investigated by usingZ‐scan techniques with an 8 ns pulsed laser at 532 nm; both clusters exhibit strong nonlinear optical absorption effect (effective α2= 1.18 × 10—10m · W—1for1and 1.0 × 10—10m · W—1for2).
Reactions at the Boron‐Carbon Double Bond of Methyl(methylidene)boranes
Authors: Paetzold Peter , Englert Ulli , Finger Rudolf , Schmitz Thomas , Tapper Alexander , Ziembinski Ralf 
Published: March 2004

AbstractThe addition of Lewis bases L to the methyl(methylidene)boranes MeB=CA2(A = SiMe3) and MeB=CAA′ (A′ = SiMe2Cl) gives the adducts MeB(L)=CA2 (1a, b; L = trimethylpyridine, PMe3) and MeB(L)=CAA′ (1c, d; L = di‐ and trimethylpyridine), respectively. Alcohols and amines HX are added to the BC double bond to give boranes MeB(X)—CHA2 (8a—c; X = OiPr, OtBu, NiPr2); MeB=CAA′ and HNMe2 react in the ratio 1:2, yielding MeB(X)—CHA(SiMe2X) (2d; X = NMe2). From MeB=CA2 and BH3, the five‐membered ring [—CA2—BH—CA2—BMe(Hm)2BMe—] (2e; 2:1) or the six‐membered ring [—CA2—BH(Hμ)2BMe—CA2—BH(Hμ)2BMe—] (2f; 1:1) are formed, both containing double hydrogen bridges; the product 2f crystallizes in the space group P1¯. The metallocene trihydrides [Cp2MH3] add to the BC double bond under formation of a double hydrogen bridge to give [Me(A2CH)B(Hμ)2MCp2] (2g, h; M = Nb, Ta). MeB=CA2 can be chloroborated, ‐stannated, and ‐phosphated with E—Cl to yield the boryldisilylmethanes MeB(Cl)—CA2—E (2i—l; E = EtClB, tBuClB, Me2ClSn, Cl2P). The alkyloboration and ‐alumination with E—R leads to the boryldisilylmethanes MeBR—SiA2—E (2m—o; E—R = Me2B—Me, Et2B—Et, Cl2Al—Et) and the bromination to MeB(Br)—CA2Br. (2+2) Cycloadditions are achieved, when MeB=CA2 is reacted with unsaturated molecules a=b, yielding four‐membered rings [—BMe—CA2—b—a—] [4a—d; a=b = fluorenone, bis(methoxycarbonyl)ethyne (reacting at both of the C=O bonds), phenylisocyanate (reacting at the C=O bond), N‐isopropylacetoneimine], or with triple bond systems RC≡Z, yielding four‐membered rings [—BMe—CA2—Z=CR—] (4e—g; RC≡Z = PhC≡CPh, AC≡CCl, tBuC≡P). With a series of six molecules with an element‐oxygen double bond, a primary (2+2) cycloaddition is followed by a metathetical splitting of the transient four‐membered rings 4h—m. One of the metathesis products is MeB≡O, which is identified as boroxene (MeBO)3, the other component is an alkene RR′C=CA2 [starting from MeB=CA2 and PhCHO, PhC(Me)O] or an alkene RR′C=CAA′ (starting from MeB=CAA′ and PhCHO, tBuCHO) or the methylidene phosphorane Ph3P=CA2 (starting from MeB=CA2 and Ph3PO) or the dicarbadicobaltatetrahedrane [(CA)2{Co(CO)3}2] {starting from MeB=CA2 and [Co2(CO)8]}. The (2+3) cyclodaddition of MeB=CA2 to the azide X2PN3 (X = NiPr2) as 1, 3‐dipole gives the five‐membered ring [=BMe—CA2—N=N—NX=] (5a) and to RN3 the rings [=BMe—CA=N—NA—NR=] (5′b, c; R = iBu, A; formed from the cycloadducts 5b, c by migration of A); analogously, [=BMe—CA′=N—NA—NA=] (5′d) is formed from MeB=CAA′ and AN3. Finally, the nitrone O—NMe=CHPh and MeB=CA2 or MeB=CAA′ give the corresponding (2+3) cycloadducts 5e, f, respectively. All of the products were characterized by their 1H, 11B, and 13C NMR spectra.
The First Rare Earth Metal Thioborate: Synthesis and Crystal Structure of EuB2S4
Authors: Döch M. , Hammerschmidt A. , Krebs B. 
Published: March 2004

AbstractSystematic studies on thio‐ and selenoborates containing heavier metal cations led to the new crystalline phase EuB2S4. The crystal structure of the europium metathioborate reveals polymeric [(B2S4)2—]n anions and divalent Eu‐cations which are connected via ionic interactions. The building blocks of the anions consist of BS4‐tetrahedra. Condensation of these BS4‐tetrahedra leads to corner‐ and edge‐sharing 2D‐networks running parallel to (1 0 0). Evacuated carbon coated silica tubes were used as reaction vessels since temperatures up to 990 K were applied. EuB2S4 crystallizes in the monoclinic space group P21/c (no. 14) with a = 6.4331(6)Å, b = 14.099(1)Å, c = 6.0731(6)Å, β = 110.55(8)° and Z = 4.
Weak Interionic Interactions in 2‐Haloimidazolium Hexahalotellurates(IV) [1]
Authors: Kuhn Norbert , Abu‐Rayyan Ahmed , Eichele Klaus , Piludu Carla , Steimann Manfred 
Published: March 2004

AbstractThe 2‐haloimidazolium salts [C11H20N2X]X [1; X = Cl (a), Br (b)] react with TeX4 to give the salts [C11H20N2X]2[TeX6] [2; X = Cl (a), Br (b)]. The crystal structure analyses of 2a and 2b · CH2Cl2 reveal the presence of ionic pairs linked by weak halogen to halogen interactions.
Polyol‐Metall‐Komplexe.47 Kristalline D‐Mannose‐Kupfer(II)‐Komplexe aus Fehlingscher Lösung
Authors: Klüfers Peter , Kunte Thomas 
Published: March 2004

AbstractBlaue, zersetzliche Kristalle von K3[Cu5(β‐D‐Manp)4H—13] · α‐D‐Manp · 16.5 H2O (1), die einen pentanuclearen Kupfer(II)‐Komplex des reduzierenden Zuckers D‐Mannose in der β‐Pyranoseform (β‐D‐Manp) enthalten, werden aus eiskalten wässrig‐alkalischen Lösungen erhalten. Das homoleptische Pentacuprat enthält verbrückende Mannopyranose‐Liganden, welche die Ladung 4— und 2.5— tragen. Zusatz von Ethylendiamin (en) zu den Fehling‐Lösungen führt zur Kondensation des Diamins mit Mannose zu N, N′‐Bis(β‐D‐mannopyranosyl)‐ethylendiamin (L). Es können Kristalle von [(en)2Cu7(β‐D‐Manp1, 2, 3, 4H—4)2(L2, 3, 4H—3)2] · 26.6 H2O (2) isoliert werden, deren heptanuclearer CuII‐Komplex sich vom homoleptischen Mannosekomplex strukturell ableitet.
Synthesis and Characterization of some Unsymmetrical Schiff Base Ligands and their Nickel(II) Complexes Incorporating o‐Phenylenediimine Units
Authors: Opozda Ewa M. , Łasocha Wiesław , Włodarczyk‐Gajdab Barbara 
Published: March 2004

AbstractSix new nickel(II) complexes of the unsymmetrical Schiff base ligands derived from o‐phenylenediamine were synthesized. These complexes were prepared by template and non‐template reactions of the precursor 3‐acetyl‐4‐[N‐(2'‐aminophenyl)‐amino]‐3‐buten‐2‐one (HL°) with appropriate o‐hydroxycarbonyl aromatic compounds, aromatic 1, 3‐oxo aldehydes and 1, 3‐diketones.The nickel(II) compounds were characterized by analytical and spectroscopic methods. Crystal structure of complex [3‐acetyl‐(6, 7)‐benzo‐8‐salicylidene‐5, 8‐diazahepta‐3‐ene‐2‐onato(2‐)]nickel(II) (NiL1) has been determined by X‐ray powder diffraction method, revealed that the molecules are almost flat, and there are no forces other than van der Waals interactions between molecules. The structure was solved by global optimisation technique and refined by the Rietveld method, obtained RF and Rwp are 11.6 and 17.4%, respectively. The synthesis of a new unsymmetrical nickel(II) tetraazamacrocyclic complex is also described.
Sandwichartige Polyoxowolframate mit Indium(III) als Heteroatom — Synthese und Charakterisierung der ersten Vertreter einer neuen Familie von Anionen
Authors: Limanski E. M. , Drewes D. , Krebs B. 
Published: March 2004

AbstractDie Synthesen von drei neuen Polyoxowolframaten mit Indium als Heteroatom werden vorgestellt. Die Verbindungen wurden vollständig durch Röntgenstrukturanalysen sowie IR‐ Spektroskopie und Elementaranalyse charakterisiert. Die neuartigen Verbindungen stellen die ersten Beispiele für sandwichartige Heteropolyanionen dar, die mit Indium(III) ein Element der dritten Hauptgruppe enthalten. Die Heteropolyanionen in Na5nH2n[{In(H2O)2}1, 5{Na(H2O)2}0, 5{In(H2O)2}2(SbW9O33)2]n · 28n H2O (1) und Na2K2H2[{In(H2O)3}2{In(H2O)2}2(AsW9O33)2] · 37 H2O (2) sind dem sogenannten M2X2M20‐Typs zuzuordnen. Sie sind aus zwei β‐B‐[XW9O33]‐Fragmenten aufgebaut, die sich von Defektstrukturen des Keggin‐Anions ableiten lassen. Diese Untereinheiten sind über vier MO6‐Oktaeder (M = InIII bzw. Na in 1 und InIII in 2) verknüpft und bilden so den M2X2M20‐Typ aus. Das Anion in Na10H2[In4(H2O)2(CoW9O34)2] · 43 H2O (3) ist ein neuer Vertreter des M4X2W18‐Typs, in dem zwei α‐B‐[XW9O34]‐Einheiten über einen Ring aus vier InO6‐Oktaedern verknüpft sind.1 kristallisiert im monoklinen Kristallsystem (C2/c) mit a = 19, 370(4), b = 17, 852(4), c = 30, 015(6) Å und β = 97, 38(3)°. 2 kristallisiert im monoklinen Kristallsystem (C2/m) mit a = 20, 323(4), b = 15, 269(3), c = 16, 014(3) Å und β = 94, 06(3)°. 3 zeigt Gitterkonstanten von a = 13, 047(3), b = 17, 735(4), c = 21, 054(4) Å und einen Winkel β = 93, 38(3)° bei monoklinem Gitter (Raumgruppe P21/n).