Synthesis, characterization and electrochemical study of synthesis of a new Schiff base (H₂cddi(t)butsalen) ligand and their two asymmetric Schiff base complexes of Ni(II) and Cu(II) with NN'OS coordination spheres.

A novel Schiff base (H(2)cddi(t)butsalen) ligand was prepared via condensation of Methyl-2-{N-(2'-aminoethane)}-amino-1-cyclopentenedithiocarboxylate(Hcden) and 3,5-di-tert-butyl-2-hydroxybenzaldehyde. The ligand and Ni(II) and Cu(II) complexes were characterized based on elemental analysis, IR, (1)H NMR, (13)C NMR, UV-Vis spectrometry and cyclic voltammetry. The structure of copper{methyl-2-{N-[2-(3,5-di-tert-butyl-2-hydroxyphenyl)methylidynenitrilo]ethyl}amino-1-cyclopentedithiocarboxylate has been determined by X-ray crystallography.

Methyl 2-{2-[(E)-(2-hy-droxy-3-meth-oxy-benzyl-idene)amino]-ethyl-amino}-cyclo-pentene-1-carbodithio-ate.

In the title Schiff base compound, C(17)H(22)N(2)O(2)S(2), which adopts an E configuration with respect to the imine C=N double bond, the C=N and N-C bond distances are 1.2789 (16) and 1.4546 (16) Å, respectively.