THE COORDINATION CHEMISTRY OF (2-THIAZOLIN-2-YL)HYDRAZINE HYDROCHLORIDE (TZHYHCL) .2. STUDY OF ITS INTERACTION WITH ZINC(II) AND CADMIUM(II)

The complexation equilibria of (2-thiazolin-2yl)hydrazine hydrochlorid e (TzHyHCl) with zinc(II) and cadmium(II) have been studied in aqueous solution at 298 K and 0.1 M ionic strength in NaClO4. The formation c onstants were determined and are discussed in terms of the characteris tics of the ligand. The compounds [ZnCl(TzHy)(2)]Cl and [Cd(TzHy)(mu-C l)(2)](n) . nH(2)O have been isolated acid their crystal structures de termined. In the Zn-II compound, the geometry around the central atom is a distorted trigonal-bipyramid composed of four nitrogen atoms from two TzHy ligands and one chlorine. The Cd-II complex is polymeric, wi th octahedrally coordinated cadmium linked into infinite chains by dou ble (mu-chloro) bridges. The coordination sphere around each cadmium c enter is completed by two nitrogen atoms from a TzHy ligand. In both c ases, the crystal structure is stabilized by an extensive hydrogen-bon d network. Copyright (C) 1996 Elsevier Science Ltd