Copper(II) Azide and Tetrafluoborate Complexes with Substituted Imidazoles

Department of Chemistry, Utkal University, Vani Vihar, Bhubaneswar-751 004 Manuscript received 26 April 1978, revised 20 July 2978, accepted 6 October 1978. Complexes of copper(II) azide and tetrafluoborates were prepared with several substituted imidazoles. The complexes were either planar and four-coordinated as in CuL2(N3)2 (L=1-Vinyl, 2-Isopropyl, 2-Ethyl imidazole) or tetragonal and six-coordinated as in CuL4(N3)2(L=1-Methyl, 2-Methyl imidazole) and [CuL4(BF4)2](L=1-Vinyl, 2-Methyl, 2-Isopropyl imidazole). The compounds do not have any Cu-Cu interaction, as is clear from the experimental magnetic moments lying in the 1.7-1.9 B.M. range. The i.r. spectra provided evidence for unsymmetrical coordination of the azide ion, N-3 as well as suggested the coordination behaviour of the BF-4 ion