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  • 1
    Electronic Resource
    Electronic Resource
    Reaktive E = C(p - p)π-Systeme, XXXI Erste Vertreter aminosubstituierter 1,2,4-Diazaphosphole (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 411-414 
    Details
    ISSN: 0009-2940
    Keywords: Phosphaalkyne, amino- ; [3 + 2] Cycloaddition ; 1,2,4-Diazaphospholes ; 1,2,3-Diazaphospholes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactive E = C(p - p)π Systems, XXXII[1].  -  First Representatives of Amino-Substituted 1,2,4-Diazaphospholes(Diisopropylamino)phosphaethyne iPr2N - C≡P reacts at 20° C in a [3 + 2] cycloaddition with (trifluoromethyl)diazomethane (2a) or methyl diazoacetate (2b) to yield a mixture of the corresponding regioisomers 1H-1,2,4-diazaphospholes (5a or 5b) and 1H-1,2,3-diazaphospholes (6a or 6b) in quantitative yields (isomer ratio: 5a/6a = 2:1; 5b/6b = 4:1). X-ray diffraction studies on 5a and 5b indicate a delicate charge balance in the bonding system of 1H-1,2,4,σ2-diazaphospholes under the influence of the exocyclic push/pull substituents iPr2N and CF3 or CO2Me, respectively.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250219
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  • 2
    Electronic Resource
    Electronic Resource
    Zink-Koordinationsverbindungen mit Imidazolin- und Imidazol-DonorligandenProfessor Dietrich Mootz zum 60. Geburtstage gewidmet (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1183-1195 
    Details
    ISSN: 0044-2313
    Keywords: Zinc complexes ; imidazole ; imidazoline ; bisimidazoline complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zinc Coordination Compounds with Imidazoline and Imidazole Donor Ligands.By reaction of the two bidentate bisimidazoline ligands 1,2-bis(2-imidazoline-2-yl)ethan (BIE) and 1,2-bis(2-imidazoline-2-yl)benzene (BIB) with zinc bromide under various reaction conditions the complexes [ZnBr2(BIE)] (1), [ZnBr2(BIB)] (2), [Zn(BIE)2]Br2 (3) and [Zn(BIB)2](BPh4)2 (4) were synthesized and characterized. In all compounds the zinc atom is tetrahedrally coordinated, either by a bidentate ligand and two bromine ligands, or by two of the chelate ligands. Zn—N—bond distances for 1-4 range from 1.966(2) to 2.013(3) Å, and the Zn—Br distances from 2.372(1) to 2.403(1) Å. [3-(imidazole-1-yl)-1-oxopropyl]benzene (IOB) was prepared as a novel imidazole ligand which carries a keto-O atom in 1,5-position to the pyridine-N atom. The zinc in [ZnCl2(IOB)2] (5) is coordinated by two ligands and two Cl atoms forming a distorted tetrahedral ZnN2Cl2 unit (Zn—N: 2.013(3) and 2.029(2) Å; Zn—Cl: 2.226(1) and 2.242(1) Å).The colourless compounds 1-5 were characterized by IR, 1H-NMR, X-ray absorption spectra and single-crystal X-ray structure analysis. Space groups and structural data: 1: P21/c, a = 7.717(2), b = 22.814(5), c = 8.026(2) Å, β = 117.58(2)° (140 K), R = 0.0283; 2: Cc, a = 11.831(3), b = 11.677(1), c = 11.846(1) Å, β = 114.55(2)°, R = 0.0237; 3: P42/n, a = 7.931(1), c = 16.945(1) Å, R = 0.0312; 4: P21/c, a = 18.666(2), b = 16.615(2), c = 19.786(2) Å, β = 99.17(1)°, R = 0.0472; 5: P21/c, a = 9.173(2), b = 9.230(1), c = 28.357(3) Å, β = 96.63(1)°, R = 0.0317.
    Notes: Durch Umsetzungen der zweizähnigen Bisimidazolin-Liganden 1,2-Bis(2-imidazolin-2-yl)ethan (BIE) und 1,2-Bis(2-imidazolin-2-yl)benzol (BIB) mit Zinkbromid unter verschiedenen Reaktionsbedingungen konnten die Komplexverbindungen [ZnBr2(BIE)] (1), [ZnBr2(BIB)] (2), [Zn(BIE)2]Br2 (3) und [Zn(BIB)2](BPh4)2 (4) synthetisiert und charakterisiert werden. Das Zinkatom ist jeweils tetraedrisch von einem zweizähnigen Chelatliganden und zwei Bromatomen oder von zwei dieser Liganden koordiniert. Die Zn—N-Bindungslängen in 1-4 variieren zwischen 1,966(2) und 2,013(3) Å, für die Zn—Br-Abstände wurden Werte zwischen 2,372(1) und 2,403(1) Å beobachtet. Mit dem neuen Liganden [3-(Imidazol-1-yl)-1-oxopropyl]benzol (IOB) gelang die Synthese des Komplexes [ZnCl2(IOB)2] (5), in dem eine tetraedrische ZnN2Cl2-Koordinationseinheit vorliegt (Zn—N: 2,013(3) und 2,029(2) Å; Zn—Cl: 2,226(1) und 2,242(1) Å).Die farblosen Verbindungen 1-5 wurden durch IR-, 1H-NMR- und Röntgenabsorptionsspektren sowie durch vollständige Röntgenstrukturanalysen charakterisiert. Raumgruppen und Gitterkonstanten: 1: P21/c, a = 7,717(2), b = 22,814(5), c = 8,026(2) Å, β = 117,58(2)° (140 K), R = 0,0283; 2: Cc, a = 11,831(3), b = 11,677(1), c = 11,846(1) Å, β = 114,55(2)°, R = 0,0237; 3: P42/n, a = 7,931(1), c = 16,945(1) Å, R = 0,0312; 4: P21/c, a = 18,666(2), b = 16,615(2), c = 19,786(2) Å, β = 99,17(1)°, R = 0,0472; 5: P21/c, a = 9,173(2), b = 9,230(1), c = 28,357(3) Å, β = 96,63(1)°, R = 0,0317.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190707
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  • 3
    Electronic Resource
    Electronic Resource
    Transition-Metal Thiolates: From Molecular Fragments of Sulfidic Solids to Models for Active Centers in BiomoleculesDedicated to Professor Hans Georg von Schnering on the occasion of his 60th birthday (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 30 (1991), S. 769-788 
    Details
    ISSN: 0570-0833
    Keywords: Thiols ; Bioinorganic chemistry ; Active centers ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thiolates are presently a subject of great interest in the chemistry of complexes involving transition-metal elements and soft ligands. The manifold electronic and steric capabilities offered by the monodentate ligands RS⊖ and the bidentate chelate ligands ⊖SRS⊖ have been used to stabilize a broad spectrum of mononuclear, oligomeric, and polymeric complexes with new and remarkable structures and properties. Impetus has especially been provided by the synthesis of polynuclear cagelike homo- and heteroleptic metal-sulfur frameworks, which can often be regarded as “molecular fragments” of the structures of inorganic sulfides. Thiolates and mixed sulfide-thiolates of the late open- and closed-shell 3d metals (Fe, Co, Ni, Cu, Zn) and some of their homologues (Au, Cd, Hg), as well as of Mo, are of particular importance as model complexes for biologically important metal centers coordinated by sulfur. They have played an important role in increasing our understanding of the structure, bonding, and function of the reactive centers in ferredoxins, rubredoxins, nitrogenases, blue copper proteins, metallothioneins, and antiarthritic drugs.
    Additional Material: 41 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.199107691
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