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  • 1
    ISSN: 0044-2313
    Keywords: Cyanamidocarboxylate complexes ; IR ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pseudoelement Compounds VII. [1] Crystal and Molecular Structure of Tris(ethylenediamine)nickel(II)-bis(2-methyl-4-chlorophenoxy-cyanamidoacetate)Surprisingly, in the presence of ethylenediamine 2-methyl-4-chlorphenoxy-cyanamidoactetate reacts with nickel(II) and copper(II) ions preferentially under formation of complexes of the type [M(en)3]X2. The IR spectra and the X-ray diffraction investigations corresponding to [Ni(en)3][2-Me-ClC6H3OCH2C(O)NCN]2 show that two cyanamidocarboxylate ions [RC(O)NCN]- are bonded to the complex cation through, in each case, two N—H … O=C hydrogen bonds between NH protons of ethylenediamine ligands and the carbonyl oxygen atoms. Additionally, in the crystal weak N—H … N≡C bridges were found between the nitrile nitrogen atoms of the anions and NH protons of neighbouring complex cations.
    Notes: 2-Methyl-4-chlorphenoxy-cyanamidoacetat bildet zu unserer Überraschung mit Nickel(II)- und Kupfer(II)-Ionen in Gegenwart von Ethylendiamin bevorzugt Komplexe der Zusammensetzung [M(en)3]X2. IR-spektroskopische Messungen und die Kristallstruktrukturuntersuchung an [Ni(en)3][2-Me-4-ClC6H3OCH2C(O)NCN]2 zeigen, daß zwei Cyanamidocarboxylat-Anionen [RC(O)NCN]- über jeweils zwei N—H … O=C-Wasserstoffbrückenbindungen zwischen N—H-Protonen der Ethylendiamin-Liganden und den Carbonyl-Sauerstoffatomen an ein komplexes Kation [Ni(en)3]2+ gebunden sind. Im Kristall liegen außerdem noch schwache N—H … N≡C-Brücken zwischen Nitril-N-Atomen der Anionen und NH-Protonen benachbarter komplexer Kationen vor.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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