Complexes of nickel(II) and copper(II) with some 2,3,4,5-tetrahydro-1H-1,5-benzodiazepines

Abstract

The preparation and characterisation of some nickel(II) and copper(II) complexes with methyl-substituted tetrahydro-1,5-benzodiazepines are reported. Some magnetic properties and electronic and vibrational spectroscopic data are discussed. The nickel perchlorate complexes appear to be square-planar with two diazepine ligands assuming a trans-arrangement. The copper perchlorate complex of the trimethylbenzodiazepine is also square-planar but a decrease in the methyl-substitution of the diazepine ligand apparently allows the approach of further co-ordinating species and the formation of five-co-ordinate complexes. Five-co-ordination is also present in the nickel chloride complexes whereas the corresponding bromide and iodide complexes are square-planar.