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  • 1985-1989  (2)
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  • 1
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary New coligand isomers of composition Cu{N(CN)2}2(pz)2 and Cu{pz · N(CN)2}2 (pz = pyrazole) were prepared and studied by measuring their magnetic susceptibilities up to 4.2K and by aid of their e.s.r., ligand field and i.r. spectra. The susceptibility data have been analysed with various models for the exchange-coupled copper(II) polymers. It is shown that the resultant exchange coupling is ferromagnetic for Cu{N(CN)2}2(pz)2 (J ∼ 1.1 - 1.4 cm−1) but antiferromagnetic for Cu{pz · N(CN)2}2 (J ≈ −0.4 cm−1). A polymeric chain structure is proposed for Cu{N(CN)2}2(pz)2 havingpseudo-octahedrally coordinated copper(II) and CN-bridging dicyanamide ligands. Its coligand isomer contains anionic chelate ligands, formed by nucleophilic addition between N(CN)2 and pz in the copper(II) coordination sphere, and giving with this central atom a square-planar system. Definite, but slight axial interaction takes place between these structure units.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Influence of Potassium Tricyanmethanide and Dicyanamide on the Anodic Behaviour of Copper in Aqueous SolutionsElectrochemical measurements on copper anodes in aqueous solutions of potassium tricyanmethanide and dicyanamide show a strong tendency of passivation of copper. Comparative galvanostatic investigations of copper in aqueous solutions of the potassium halides and pseudo-halides KX (X: Cl, Br, J, SCN, N(CN)2, N(CN)2, C(CN)3) are indicating a clear increase in the efficiency of the formation of a passivating layer in the series Cl- ≲ Br-〈J-〈SCN-〈N(CN)2-〈C(CN)3-. In solutions of halides the first anodic process is followed by the second one at few increased potential, whereas a broad passive areal appears in solutions of pseudohalides, for instance in the cases of tricyanmethanide and dicyanamide.
    Notes: Elektrochemische Versuche an Kupferanoden in wäßrigen Lösungen von Kaliumtricyanmethanid und Kaliumdicyanamid belegen eine ausgeprägte Passivierungstendenz von Kupfer in diesen Pseudohalogenidlösungen. Vergleichende galvanostatische Untersuchungen in wäßrigen Lösungen der Kaliumhalogenide und -pseudohalogenide KX (X: Cl, Br, J, SCN, N(CN)2, C(CN)3) ergeben eine deutliche Zunahme der Effizienz bei der Ausbildung auflösungshemmender Deckschichten in der Reihe Cl- ≲ Br-〈J-〈SCN-〈N(CN)2-〈C(CN)3-. Während in den Halogenidlösungen der erste Anodenprozeß bei wenig höherem Potential von einem zweiten Anoden-prozeß gefolgt wird, tritt in den Pseudohalogenidlösungen, insbesondere den Kaliumdicyanamid- und tricyanmethanidlösungen ein ausgedehntes Passivgebiet nach dem ersten Anodenprozeß auf.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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