Introduction In relation to kinetic studies which examined the effects of remote substituents on the copper(11)-promoted solvolyses of nickel(@ complexes in dimethyl sulphoxide (dmso),' we report the preparations and some brief characterization studies on chelates containing tridentate [mainly (ONS) donor set] and tetradentate (cis-02N2) Schiff base ligands. Complex structures are given in Figures 1 and 2. The chelate-plane structures of the 1 : 1 nickel : tridentate ...