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    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 531 (1985), S. 26-30 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gold Nitrogen Heterocycles. 3. Synthesis, Properties, and Structure of Amido Dimethyl Gold(III), [(CH3)2 AuNH2]3The reaction of [(CH3)2AuI]2 with KNH2 in liquid NH3 yields tetrameric and trimeric amido dimethyl gold(III). The tetrameric form transforms at ambient temperature easily in the more stable trimeric complex. [(CH3)2AuNH2]3 forms air-stable, colorless crystals, which are sensitive against irridiation with light. It crystallizes in the orthorhombic space group Ama2 with the lattice constants a = 1653.4, b = 1844.4, c = 448.1 pm, Z = 4. In the trimeric complex the Au(CH3)2 groups are linked together by symmetrical amido bridges forming a six membered Au—N heterocycle in the chair conformation. The Au atoms exhibit a square-planar coordination of two CH3 groups (Au—C = 203 pm) and two N atoms (Au—N = 215 pm) in a cis arrangement. The symmetry C3v was confirmed for the complex in solution and in the solid state. The vibrational spectra as well as the H-NMR and mass spectra are discussed.
    Notes: Die Reaktion von [(CH3)2AuI]2 mit KNH2 in flüssigem NH3 liefert neben tetramerem Amidodimethylgold(III) auch die bisher unbekannte trimere Form [(CH3)2AuNH2]3. Bei Raumtemperatur wandelt sich die tetramere Form leicht in den stabileren trimeren Komplex um. Dieser bildet hydrolysebeständige farblose Kristalle, die sehr lichtempfindlich sind. [(CH3)2AuNH2]3 kristallisiert orthorhombisch in der Raumgruppe Ama2 mit den Gitterkonstanten a = 1653,4, b = 1844,4, c = 448,1 pm, Z = 4. Im trimeren Komplex sind die Au(CH3)2-Gruppen über symmetrische Amidobrücken zu einem Au—N-Sechsring in der Sesselkonformation verknüpft. Die Au-Atome sind von zwei cis-ständigen CH3-Gruppen (Au—C = 203 pm) und zwei N-Atomen (Au—N = 215 pm) quadratisch-planar koordiniert. Der Komplex hat in Lösung und im Kristall die Symmetrie C3v. Das Schwingungsspektrum, sowie H-NMR- und Massenspektrum werden diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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