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Reaction of Co n with N(CN)~ or C(CN)3 in the presence of imidazole (iz) or its methyl derivatives (2-meiz and 4-meiz) gave eight compounds of CoiI: ligand stoichiometry 1:2, including two isomeric pairs (~ and B) for the complexes [Co{C(CN)3}2(2-meiz)2 ] and [Co{C(CN)3}2-(4-meiz)2 ]. The complexes were studied by electronic and i.r. spectroscopies. For ~-[Co{C(CN)3}2(2-meiz)2 ] singlecrystal X-ray analysis was performed; its crystal structure consists of one-dimensional chains, formed by C(CN)~ anions bridging between the Co rr atoms. The Co H atom is nearly octahedrally coordinated by two tertiary nitrogens of 2-meiz and four nitrogens of C(CN)3. The spectra of these compounds and of the complexes with iz, as well as that of ~-[Co{C(CN)3 } 2(4-meiz)2], indicate all these compounds to have basically the same bridging polymeric octahedral structure. However, the spectra indicate distorted tetrahedral structures for the remaining compounds.

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