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  • 1
    ISSN: 0044-2313
    Keywords: Zinc ; Cadmium ; 2,2′-bis(pyrazol-1-yl)propane ; adduct complexes ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zink- und Cadmium-Addukte des 2,2′-Bis(pyrazol-1-yl)propan, (L—L), einem sterisch anspruchsvollen Liganden. Kristallstruktur des (L—L)Zn[OC(=O)CF3]2(H2O)1:1 Addukte zwischen dem Titelliganden und MX2 (M = Zn oder Cd; X = Cl, Br, I oder C2F3O2) bzw. den ionischen Verbindungen [(L—L)5Zn2(H2O)2](ClO4) 4 und [(L—L)2 Cd(H2O)2](ClO4)2 wurden dargestellt. Diese sind stabil im festen Zustand und in Aceton-Lösung, nicht jedoch in Dimethylsulfoxid-Lösung. In der Struktur des (L—L)Zn(H2O)[O—C(=O)CF3]2 liegt, auf Grund einer durch die Methylgruppen verursachten sterischen Behinderung, eine verzerrte trigonale Bipyramide vor, in der zwei Sauerstoffatome (vom Wasser und Trifluoroacetat) und ein Stickstoffatom in der äquatorialen Ebene liegen. Die axialen Zn—X-Bindungen (X = N = 2,125(3) Å; X = O = 2,085(4) Å) sind länger als die äquatorialen.
    Notes: 1:1 adducts between the title ligand and MX2 (M = Zn or Cd; X = Cl, Br, I or trifluoroacetate) as well as ionic compounds [(L—L)5Zn2(H2O)2](ClO4) 4 and [(L—L)2Cd(H2O)2](ClO4) 2 are stable in the solid state and in acetone solution, but not in dimethylsulphoxide. In (L—L)Zn(H2O)[O—C(=O)CF3]2 two oxygen atoms (belonging to water and to one O—C(=O)CF3) at 2.039(4) and 2.008(4) Å from Zn, and one nitrogen atom (Zn—N 2.067(3) Å) from the chelating L—L define the basal plane of a trigonal bipyramid, which is distorted owing to the steric requirements of the bridgehead methyls of L—L; the axial Zn—X bonds (X = N 2.125(3) Å; X = O 2.085(4) Å), are longer than the equatorial Zn—X bonds.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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