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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung, Charakterisierung und Elektronenstruktur von Thiometallato-Komplexen des Cobalts des Typs [Co(TM)2]m- mit unterschiedlicher ElektronenpopulationKomplexe des Typs [Co(MO4-nSn)2]2- (M = Mo, W; n = 2, 3, 4) sowie der größte Teil der entsprechenden Trianionen [Co(MoO4-nSn)2]3-, die aus den Dianionen durch Reduktion erhalten werden, wurden dargestellt und spektroskopisch (IR, UV/VIS/NIR, EPR) sowie elektrochemisch untersucht. Die Spezies haben delokalisierte elektronische Grundzustände und bemerkenswerte Metall-Ligand-Wechselwirkungen, die zu ungewöhnlichen Elektronenabsorptionsspektren führen. Darüber hinaus werden die Elektronenstruktur und die elektrochemischen Eigenschaften der Komplexe, die mit unterschiedlicher Elektronenpopulation existieren, im Zusammenhang mit den Eigenschaften anderer 3d-Übergangsmetall-Thiometallatkomplexe diskutiert. Untersuchungen der Komplexbildung in Lösung mit Hilfe der Elektronenabsorptionsspektroskopie und zyklischer Voltammetric erlaubten die Ermittlung physikalischer Daten der Spezies, welche nicht in kristalliner Form erhalten werden konnten. Zu Einzelheiten der Kristallstrukturanalysen siehe Abstract.
    Notes: Synthetic, spectroscopic (IR, UV/VIS/NIR, EPR), and electrochemical studies have been carried out for complexes of the type [Co(MO4-nSn)2]2- (M = Mo, W; n = 2, 3, 4) and most of the corresponding trianions [Co(MoO4-nSn)2]3-, which can be obtained from the dianions by reduction. The complexes have delocalized electronic ground states and remarkable metal-ligand interactions, leading to unusual electronic absorption spectra. The electronic structure and the electrochemical properties of the species existing with different electron populations are also discussed in relation to those of other 3 d transition metal thiometallato complexes. The crystal structures of [(Ph3P)2N]2[Et4N][Co(MS4)2] · 2 CH3CN (M = W (1), Mo (2)) have been determined. The compounds crystallize in the orthorhombic space group P21212 (Z = 2) with unit cell dimensions: a = 1252.6(4), b = 3385.2(7), c = 1077.6(3) for 1; a = 1261.0(9), b = 3393.2(28), c = 1084.4(7) pm for 2. The structure of the anions consists of two tetrahedral MS4 units acting as bidentate ligands to the central Co atoms with significant deviation from idealized D2d symmetry (W—;Co—;W = 168.3(2), Mo—;Co—;Mo = 169.6(8)°). Averaged interatomic distances (pm) for 1 are as follows (values for 2 in brackets): Co—;Sbr = 224.4 (219), Co—;M = 272.7 (275), M—;Sbr = 223.0 (223), M—;Sterm = 217.5 (215) pm. Investigations of complex formation in solution, using electronic absorption spectroscopy and cyclic voltammetry, allowed physical data of those species which could not be isolated in crystalline form to be obtained.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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