Laser Raman and infrared spectral studies on imidazolium complexes of bivalent copper and zinc

Abstract

The complexes [imH₂]₂ [CuCl₄], [imH₂], [CuBr₄], and [imH₂]₂ [ZnCl₄] containing the imidazolium cation [imH₂]+ have been prepared for the first time and studied by laser Raman and infrared spectroscopy. The spectroscopic data are compared to those from studies with imidazole, imidazolium chloride, methylammonium tetrachlorocuprate(II), caesium tetrachlorocuprate(II), and caesium tetrachlorozincate(II). It is concluded that in [imH₂]₂ [MCl₄] (M = Cu and Zn), a distorted tetrahedral (D_2d) model is favoured for [CuCl₄]^2- and that [ZnCl₄]^2- possesses a slight distortion from T_d symmetry.