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  • Inorganic Chemistry  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 483 (1981), S. 26-32 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of the Molybdenum Dioxide Dichloride  -  Phosphorus Oxide Trichloride Adduct MoO2Cl2 · POCl3The crystal structure of MoO2Cl2 · POCl3 was determined by X-ray methods (R = 0.046; 2497 independent reflexions). MoO2Cl2 · POCl3 crystallizes monoclinic in the space group P21/c with Z = 8. It forms nearly linear chains in which the Mo atoms are linked together via weakly bent and asymmetric oxo bridges (Mo—O = 172 and 218 pm). The Mo atoms are surrounded in a distorted octahedral coordination by one O and two Cl atoms (Mo—Cl = 230-232 pm) as terminal ligands and by the POCl3 molecule and the bridging O atoms as well. The POCl3 molecule (Mo—O = 233 pm) is located in trans position to the terminal oxo ligand (Mo—O = 166 pm).
    Notes: Die Kristallstruktur von MoO2Cl2 · POCl3 wurde durch Röntgenbeugungsexperimente ermittelt (R = 0,046; 2497 unabhängige Reflexe). MoO2Cl2 · POCl3 kristallisiert monoklin in der Raumgruppe P21/c mit Z = 8. Es bildet eine nahezu lineare Kettenstruktur aus, in der die Mo-Atome über schwach gewinkelte asymmetrische Oxobrücken verknüpft sind (Mo—O = 172 und 218 pm). Jedes Mo-Atom ist verzerrt oktaedrisch von einem O- und zwei Cl-Atomen (Mo—Cl = 230-232 pm) als terminale Liganden sowie dem POCl3-Molekül und den transständigen Oxobrücken umgeben. Das POCl3-Molekül (Mo—O = 233 pm) befindet sich in trans-Stellung zum terminalen Oxoliganden (Mo—O = 166 pm).
    Additional Material: 1 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 482 (1981), S. 113-120 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Azido Complexes of Zirconium: ZrCl3N3, [ZrCl4N3]22⊝, [ZrCl4(N3)2]2⊝; Crystal Structure of (PPh4)2 [ZrCl4N3]2Highly explosive ZrCl3N3 is formed by the reaction of ZrCl4 with iodine azide in dichloromethane suspension. According to the i.r. spectra, the compound is polymeric by azide and chlorine bridges. Zirconium tetrachloride reacts with one and two moles of tetraphenylphosphonium azide respectively, forming the thermally and mechanically stable complexes (PPh4)2[ZrCl4N3]2 and (PPh4)2[ZrCl4(N3)2]. The crystal structure of (PPh4)2[ZrCl4N3]2 was determined by X-ray methods (1942 reflexions, R = 6.5%). The complex crystallizes in the monoclinic space group P21/n with two formula units per unit cell. The structure consists of tetraphenylphosphonium cations and dimeric anions [ZrCl4N3]22⊝, in which the Zr atoms are linked by the α-N atoms of the azide groups, forming a centrosymmetric Zr2N2 ring with symmetry D2h. According to the i.r. spectra, the azide groups in the complex (PPh4)2[ZrCl4(N3)2] are covalently bonded at the Zr atom in trans positions.
    Notes: Hochexplosives ZrCl3N3 entsteht aus Zirkoniumtetrachlorid und Iodazid in Dichlormethan-Suspension. Nach dem IR-Spektrum liegt ein über Azido- und Chlorobrücken verknüpftes Polymer vor. Zirkoniumtetrachlorid bildet mit einem bzw. zwei Mol Tetraphenylphosphoniumazid die thermisch und mechanisch stabilen Komplexe (PPh4)2[ZrCl4N3]2 und (PPh4)2[ZrCl4(N3)2] Die Kristallstruktur von (PPh4)2[ZrCl4N3]2 wurde mit Röntgenbeugungsdaten ermittelt (1942 Reflexe, R = 6,5%). Die Verbindung kristallisiert monoklin in der Raumgruppe P21/n mit zwei Formeleinheiten pro Elementarzelle. Es liegen Tetraphenylphosphoniumkationen und dimere Anionen [ZrCl4N3]22⊝ vor, in denen die Zirkoniumatome durch die α-N-Atome der Azidgruppen zu einem zentrosymmetrischen Zr2N2-Vierring der Symmetrie D2h verknüpft sind. In dem Komplex (PPh4)2-[ZrCl4(N3)2] sind die Azidogruppen nach dem IR-Spektrum kovalent an das Zr-Atom gebunden und in trans-Position zueinander angeordnet.
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