The first examples of nickel(II) and copper(II) complexes derived from unsymmetrical N,N-dimethylhydrazine have been obtained and studied using both spectroscopic and X-ray analyses. Square planar copper(II) coordination is slightly distorted with two trans dimethylamino and two trans imidole-oxygen donor groups. Any extra coordination due to other donor centers is hindered by methyl groups whose carbon atoms are located at a distance of 2.837-2.918 Å from the central ion.