SYNTHESIS AND STRUCTURE OF NICKEL(II) IPHENYLGLYOXAL-BIS(S-ALKYLISOTHIOCARBOHYDRAZONATE)

xal-bis(S-alkylisothiocarbohydrazonates)-complexes of Ni(II) with new tetradentate ligands of the open type were obtained by template conden sation of S-alkylisotiocarbohydrazides with diphenylglyoxal in the pre sence of Ni(II) ions (2:1:1). X-ray investigation shows that both isot hiocarbohydrazidic fragments of ligand are in cis-trans conformation. The distance between the terminal NH2-groups makes easier a subsequent macrocyclization by bifunctional agents (e.g. EtOC(O)-C(O)OEt). The N i-N distances range from 1.798 to 1.888 angstrom. Complex moieties are united in the crystal making a centrosymmetrical dimer with the Ni-Ni distance of 3.543 angstrom. The complexes and solvating molecules Of C2H5OH are H-bonded resulting in a double chain.