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  • 1
    Publication Date: 1994-02-01
    Print ISSN: 0276-7333
    Electronic ISSN: 1520-6041
    Topics: Chemistry and Pharmacology
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  • 2
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 27 (1993), S. 310-316 
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 8 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1083-1087 
    ISSN: 0009-2940
    Keywords: Calcium bis-L-pyroglutamate ; Lithium L-pyroglutamate ; Pyroglutamate coordination and conformation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Calcium bis-L-pyroglutamate and lithium L-pyroglutamate are prepared by reaction of the metal hydroxides with L-pyroglutamic acid in aqueous solution. In the solid state calcium bis-L-pyroglutamate adopts a layer structure, built up by sixteen-membered rings consisting of four L-pyroglutamate ligands bridging four calcium centers by their carboxylate groups. All three oxygen donors of the L-pyroglutamate ligands are attached to metal centers. The calcium atom lies at the center of a slightly distorted octahedron formed by four carboxylate oxygens and two amide oxygen atoms. Lithium L-pyroglutamate also features a layer structure. All three oxygen donors of the L-pyroglutamate ligand have contacts with metal atoms. The coordination sphere of the lithium atom is a slightly distorted tetrahedron consisting of three carboxylate oxygen atoms and one amide oxygen atom. The investigation of aqueous solutions of the compounds by multinuclear NMR (1H, 13C, 17O) indicates extensive electrolytic dissociation in dilute solutions.
    Additional Material: 3 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2739-2742 
    ISSN: 0009-2940
    Keywords: Orotate complexes ; Calcium complexes ; Zinc complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From aqueous solutions containing orotate (dianion of 1) and calcium or zinc ions in the molar ratio of 2:1, metal orotate (2-) hydrates are readily obtained in crystalline form at pH 9.0 and 5.4, respectively. According to an X-ray crystal structure analysis, calcium orotate tetrahydrate forms a one-dimensional coordination polymer with each orotate ligand coordinated to no less than three neighboring calcium atoms. In this cation triple, the orotate(2-) anion acts as a carboxylate-O/amide-N-chelating group for the central calcium ion, but also as a carboxylate-O/O-chelating group for the first neighboring calcium ion, and as a terminal amide-O donor for the second. Each calcium ion is thus octacoordinated and linked to three orotate(2-) anions and three water molecules. The fourth water molecule is only engaged in hydrogen bonding. The new zinc orotate(2-) phase features Zn(Or)(H2O)4 units. For the hexacoordinate zinc atom bearing four water molecules the orotate(2-) ligand also acts as an O/N-chelating group. Unlike a discrete Zn(Or)(H2O)4 H2O phase reported earlier, the lattice of the new phase contains further disordered water of crystallization, with the overall composition approaching Zn(Or) 5.5 H2O. The apparent stability of the M(Or) units probably reflects the well-documented carrier function of the orotate ligand for certain divalent metal ions in biological systems.
    Additional Material: 2 Ill.
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  • 6
    ISSN: 0009-2940
    Keywords: Dihydroanthracene ; Dihydroanthracene, butyl-substituted ; Tricarbonylchromium ; Chromium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complexes [9,10-dihydroanthracene][tricarbonylchromium]n [9,10-DHA][Cr(CO)3]n [n = 1 (1), 2 (2)] and the related mono- and bis(tricarbonylchromium) complexes of 2,6- and 2,7-di-tert-butyl-9,10-dihydroanthrancene [2,6-DB-9,10-DHA][Cr(CO)3]n [n = 1 (3), 2 (4)] and [2,7-DB-9,10-DHA][Cr(CO)3]n [n = 1 (5), 2 (6)] have been prepared by heating the 9,10-DHA species in the presence of hexacarbonylchromium [Cr(CO)6]. Evidence for the existence of the complex [2,6,9-tri-tert-butyl-9,10-DHA][Cr(CO)3] (7) is also presented. The complexes have been characterised spectroscopically, and for complex 1 an X-ray crystallographic structure determination has been carried out. This complex adopts the unexpected structure in which the non-coordinated arene ring is bent towards the Cr(CO)3 moiety. The syntheses and spectroscopic characterisations of 2,6- and 2,7-di-tert-butylanthracene (2,6- and 2,7-DBA), 2,6- and 2,7-di-tert-butyl-9,10-dihydroanthracene (2,6-and 2,7-DB-9,10-DHA), 2,6,9-, 2,7,9-, and 2,7,10-tri-tert-butyl-9,10-dihydroanthracene (2,6,9-, 2,7,9- and 2,7,10-TB-9,10-DHA), and 2,6,9,10- and 2,7,9,10-tetra-tert-butyl-9,10-dihydroanthracene(2,6,9,10- and 2,7,9,10-TeB-9,10-DHA) are also given.
    Additional Material: 6 Ill.
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  • 7
    ISSN: 0009-2940
    Keywords: Gold(I) complex ; Phosphine (selenide) complexes ; Aus···Au interactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [(CO)AuCl] reacts with equimolar amounts of Ph2PCH2P(Se)Ph2 (dpmSe) to afford ClAuPh2PCH2P(Se)Ph2, in which dpmSe is bound to gold in a monodentate fashion by phosphorus. Subsequent reaction of this 1:1 complex with AgClO4 results in the formation of the 10-membered ring complex 4 which crystallizes in the monoclinic space group P21/n with approximately centrosymmetric dicationic units, in which two gold (I) atoms are doubly bridged by two dpmSe ligands coordinated by phosphorus and selenium. The coordination at the gold atoms deviates from linearity and implies an Au···Au interaction with the gold(I) atoms separated by a distance of 3.020(1) Å.
    Additional Material: 2 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 509-513 
    ISSN: 0009-2940
    Keywords: 2-Aminoethyl phosphate complexes ; Magnesium complexes ; Calcium complexes ; Zinc complexes ; Hydrogen bonding ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Crystalline magnesium, calcium, and zinc 2-aminoethyl phosphate complexes containing the monoanions PEAH⊖ have been prepared as the tetrahydrates (Ca, Zn) and the hexahydrate (Mg), and their structures determined by single-crystal X-ray methods. The structures of monoclinic Ca(PEAH)2·4 H2O and Zn(PEAH)2·4 H2O (space group C2/c) both contain polymeric chains with metal ions connected by bridging phosphate groups. The zinc atoms are in a tetrahedral environment of four oxygen atoms, while the calcium atoms are found to be hexacoordinated with two additional oxygen atoms from water molecules in axial positions. The triclinic Mg(PEAH)2·6 H2O (space group \documentclass{article}\pagestyle{empty}\begin{document}$ P\bar 1 $\end{document}) contains discrete complex units with hexacoordinate magnesium atoms octahedrally surrounded by six oxygen atoms, four of which from water molecules in the equatorial plane and two from phosphate groups in axial positions.
    Additional Material: 3 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1829-1834 
    ISSN: 0009-2940
    Keywords: Hydrogen bis-L-pyroglutamates, lithium, sodium, potassium ; Pyroglutamate coordination and conformation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lithium, sodium and potassium hydrogen bis-L-pyroglutamate [Li(L-pGlu)(L-pGluH)], [Na(L-pGlu)(L-pGluH)] and [K(L-pGlu)(L-pGluH)], respectively, have been prepared by reaction of aqueous solutions of the metal hydroxides with L-pyroglutamic acid in the molar ratio 1:2, or in methanol. Crystalline samples of the salts could be obtained by slow evaporation of solutions of the salts in methanol. In the solid state, Li(L-pGlu)(L-pGluH) adopts a chain structure with the lithium atoms arranged in double strands. Adjacent metal centers are bridged by the carboxylate groups of the L-pGlu- ligands. The L-pGluH ligands are attached to the metal centers through the amide oxygen atoms. Na(L-pGlu)(L-pGluH) forms a three-dimensional coordination polymer with two half-occupied sodium positions, one L-pGlu- and one L-pGluH ligand in the asymmetric unit. The carboxyl and carboxylate groups of the L-pGluH and the L-pGlu- ligands are bridging the sodium centers, giving rise to eight-membered rings, which consist of two sodium atoms, a carboxyl and a carboxylate group. The hydrogen atoms of the carboxyl group of the L-pGluH ligands are involved in strong hydrogen bonds between a carboxyl and an adjacent carboxylate oxygen atom. K(L-pGlu)(L-pGluH) adopts a layer structure with strands of potassium atoms. The metal centers are connected through bridging carboxyl and carboxylate groups of the L-pGluH and L-pGlu- ligands, respectively. The structure features eight-membered ring units comparable to those observed for Na(L-pGlu)(L-pGluH), again with the hydrogen atom of the carboxyl group engaged in a strong transannular hydrogen bond. The amide oxygen atoms of the L-pGlu- and the L-pGluH ligands are coordinated to the metal centers of adjacent coordination chains. The results of 1H- and 13C—NMR investigations of aqueous solutions of the compounds indicate extensive electrolytic dissociation in dilute solutions.
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  • 10
    ISSN: 0009-2940
    Keywords: Salicylic acid ; o-Cresotic acid ; Beryllium, toxicity of ; 9Be NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The existence of well-defined crystalline beryllium salicylate(2 - ) and bis[salicylato(2 - )]beryllate complexes as well as of their o-cresotate analogs is established. The structure of (NH4)2[Be(C6H4OCO2)2] · 2.25 H2O has been determined by an X-ray structure analysis. It contains a beryllate anion of the composition [Be(C6H4OCO2)2]2- with two salicylate(2 - ) ligands acting as chelate ligands. The considerable 9Be NMR chemical shifts observed for aqueous solutions of the pure compounds indicate in all cases the persistence of the complexation of the metal ion by the catecholate ligands. 9Be NMR studies of aqueous solutions containing BeSO4 · 4 H2O and sodium salicylate(1 - ) or sodium o-cresotate(1 - ) in the molar ratios 1:1 and 1:2 show that a variety of beryllium/salicylate(2 - ) and beryllium/o-cresotate(2 - ) species are present in solution, the most prominent being Be(C6H4OCO2)-(H2O)2 and [Be(C6H4OCO2)2]2- (and their o-cresotate analogs). From such solutions in contact with air, a novel dinuclear beryllium hydroxido/o-cresotato(2 - )/carbonato complex of the stoichiometry Na3[Be2(OH)(CO3)(C7H6OCO2)2] · 8 H2O is isolated. According to an X-ray analysis the compound contains a cyclic beryllate anion with two Be(C7H6OCO2) chelate units linked by bridging hydroxide and carbonate anions. In the light of the ubiquitous availability of phenolic and carboxylic groups in many biomolecules, the finding of strong bonding of Be2+ to these functions in aqueous solution is very important.
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