Tricyanomethanide and dicyanamide complexes of Cu(II), Ni(II), Co(II), their structures and properties

This review summarizes data for all known tricyanomethanide and dicyanamide compounds of copper(II), nickel(II) and cobalt(II). The possible bonding m odes of [C(CN)(3)](-) and [N(CN)(2)](-) ions and their influence on infrare d spectra are demonstrated. Preparative methods are briefly described and s tructural data for crystallographically characterized compounds are given. Data for electronic and ESR spectra, magnetic susceptibilities, vibrational and ESCA spectra are reviewed and consequences following from these techni ques for structural characteristics are discussed. The most striking featur es of the behaviour of both pseudohalide ligands are their polydentate char acter and ability for bridging. This ability is revealed by many physical p roperties, especially by the temperature dependence of magnetic susceptibil ities, in which exchange interaction through pseudohalide bridges is manife sted. Reactivity of C(CN)(3) and N(CN)(2) groups in the coordination sphere of Cu(II) and Ni(II) is mentioned.