Synthesis and spectra of copper(II) chloride and copper(II) bromide complexes of bispidines. Molecular and crystal structure of copper chloride complexes of 1,5-diphenyl-3,7-di(2-cyanoethyl)-9-bispidone and copper bromide complexes of 1,5-diphenyl-3,7-diallyl-9-bispidone

By reaction of copper(II) chloride and bromide with the 1,5-diphenyl-3,7-dialkyl-9-bispidone series, we have synthesized a number of new complex compounds. In the IR spectra of the complexes, the absorption band for the carbonyl group is shifted toward longer wavelengths compared with the original ligands. This shift can be a criterion indicating formation of complexes of the given composition and structure. We have determined the crystal structure of two new complexes. We show that for complexes with alkylmethyl substituents at the nitrogen atoms, significant distortion of the coordination environment of the metal compared with the methyl analog is typical; this distortion is connected with the interaction between the substituents and the halogen atoms. We hypothesize that this type of interaction affects the structure and spectral properties of the complexes in solution. ©1997 Plenum Publishing Corporation.