Transition metal complexes with Girard reagent-based ligands. Part IV. Synthesis and characterization of pyridoxilidene Girard-T hydrazone complexes. Crystal structure of the copper(II) complex

Abstract

The monoligand complexes of the formula M(HPLGT)(NCS)2 (M = Cu(II), Zn(II)) in which the ligand tridentate ONO pyridoxilidene Girard-T hydrazone, [H3PLGT]Cl2 · 2H2O, was coordinated in neutral doubly deprotonated form were synthesized. Also, the first complexes with the ligand coordinated in triply deprotonated monoanionic form of the formula [Cu(PLGT)N3] and [Co(PLGT)(NO2)2NH3] · 3H2O are reported. The single crystal X-ray analysis of [Cu(HPLGT)(NCS)2] showed that Cu(II) is placed in a square-pyramidal surrounding consisting of one tridentate Schiff base and one NCS group in the basal plane and the other NCS group in the apical position. Intermolecular hydrogen bonds leading to centrosymmetrical dimerization of these complexes were discussed. In the reaction of Girard-T and Hacac in the presence of CuCl2, a mixture of single crystal complexes of the composition [Cu(3,5-Me2pz)2Cl2]2 and [Cu(acac)2] · 2[Cu(3,5-Me2pz)2Cl2] was obtained and X-ray analysis of the latter one was reported. Crystal structure of the Cu(II) complex with pyridoxilidene Girard-T hydrazone was analyzed. Additional two Cu(II) complexes obtained by the reaction of Girard-T reagent and Hacac in the presence of CuCl2 were also studied by single crystal X-ray analysis.