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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1218-1222 
    ISSN: 0044-2313
    Keywords: Phosphoraneiminato Complexes of Vanadium ; Synthesis ; IR spectra ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphoraneiminato Complexes of Vanadium. The Crystal Structure of [V3Cl6(NPMe3)5+]2[V4O4Cl8(NPMe3)22-] · 6 CH3CNVanadiumtetrachloride reacts in CCl4 solution with Me3SiNPMe3 to form the donor acceptor complex [VCl4(Me3SiNPMe3)], which reacts with excess Me3SiNPMe3 in boiling acetonitrile to form the phosphoraneiminato complex [V3Cl6(NPMe3)5]+Cl-. Partial hydrolysis in acetonitrile solution leads to black single crystals of [V3Cl6(NPMe3)5+]2[V4O4Cl8(NPMe3)22-] · 6 CH3CN, which are characterized by a crystal structure determination. Space group P21/c, Z = 2, structure solution with 3 008 observed unique reflections, R = 0.090. Lattice dimensions at -70°C: a = 1 379.0, b = 1 915.8, c = 2 278 pm, β = 102,79°. In the complex cation the three vanadium atoms form a trigonal bipyramid with two μ3-NPMe3 groups; the residual NPMe3- groups and the chlorine atoms are in terminal functions. In the anion [V4O4Cl8(NPMe3)2]2- the vanadium atoms are linked by μ2-O atoms to form a rectangle; in addition the two phosphoraneiminato ligands form μ2-N bridges.
    Notes: Vanadiumtetrachlorid reagiert in CCl4-Lösung mit Me3SiNPMe3 unter Bildung des Donor-Akzeptorkomplexes [VCl4(Me3SiNPMe3)], der sich in siedendem Acetonitril mit weiterem Me3SiNPMe3 zu dem Phosphaniminatokomplex [V3Cl6(NPMe3)5]+Cl- umsetzt. Durch partielle Hydrolyse in Acetonitrillösung entstehen hieraus schwarze Einkristalle [V3Cl6(NPMe3)5+]2[V4O4Cl8(NPMe3)22-] · 6 CH3CN, die wir röntgenographisch charakterisiert haben. Raumgruppe P21/c, Z = 2, Strukturlösung mit 3 008 unabhängigen beobachteten Reflexen, R = 0,090. Gitterkonstanten bei -70°C: a = 1 379,0; b = 1 915,8; c = 2 278 pm, β = 102,79°. In dem komplexen Kation bilden die drei Vanadiumatome mit zwei μ3-NPMe3-Gruppen eine trigonale Bipyramide, die drei übrigen NPMe3-Gruppen und die Chloratome sind terminal gebunden. In dem Anion [V4O4Cl8(NPMe3)2]2- sind die Vanadiumatome über μ2-O-Atome zu einem Rechteck verknüpft; zusätzlich fungieren die beiden Phosphaniminatoliganden als μ2-N-Brücken.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 594 (1991), S. 29-35 
    ISSN: 0044-2313
    Keywords: Nickel(12) Cluster ; Synthesis ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of NiCl2 with PhP(SiMe3)2, The Crystal Structure of [Ni12Cl2(PPh)2(P2Ph2)4(PHPh)8][Ni12Cl2(PPh)2(P2Ph2)4(PHPh)8] (1) has been prepared by the reaction of NiCl2 with PhP(SiMe3)2. The structure has been characterized by X-ray crystal structure analysis. 1 contains a Ni12-cluster with m̈4-PPh- and m̈6-P2Ph2- as bridging ligands. The terminal PHPh- and Cl-ligands are bound to Ni-atoms. The Ni12-cluster can be described as an Ni8-cube, in which four edges are bridged by Ni-atoms.
    Notes: NiCl2 und PhP(SiMe3)2 reagieren in THF unter Bildung von [Ni12Cl2(PPh)2(P2Ph2)4(PHPh)8] (1). Die Verbindung bildet schwarze Kristalle, deren Struktur durch eine Kristallstrukturanalyse aufgeklärt werden konnte. Danach liegt ein Ni12-Cluster vor, der m̈4-PPh- und m̈6-P2Ph2-Brückenliganden enthält. Die terminalen PHPh- und Cl-Liganden sind zusätzlich an Ni gebunden. Der Ni12-Cluster kann von einem Ni8-Kubus abgeleitet werden, in dem vier Kanten von Ni-Atomen überbrückt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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