Synthesis and structural characterization of Pd[CH3O(O)C6H3CHNNC(S)NH2](C5H5N)

The reaction of palladium chloride with isovanillin semithiocarbazone (VSTC), CH3O(OH)C6H3CH=NNC(S)NH2, in a mixed solvent of ethanol, pyridine and water yielded the mononuclear palladium((II)) complex Pd[CH3O(O)C6H3CHNNC(S)NH2](C5H5N), and its single-crystal structure was determined by X-ray diffraction. The crystal belongs to triclinic, space group P (1) over bar with a = 7.715(4), b = 9.809(6), c = 10.612(4) Angstrom, alpha = 93.54(4), beta = 111.00(3), gamma = 95.92(5)degrees, V = 745.0(7) Angstrom(3), M-r = 408.75, Z = 2, D-c = 1.822 g/cm(3), mu = 1.397 mm(-1) and F(000) = 408. The final R = 0.0568 and wR = 0.1439 for 2616 observed independent reflections with I greater than or equal to 2.0sigma(I). It was revealed that the palladium atom is bound to a tridentate donor ligand and a pyridine in a planar square arrangement. The sulphur-nitrogen-oxygen donor of the Schiff-base ligand in the thiol form rather than the thione one is coordinated to the palladium atom via the mercapto sulphur, the beta-nitrogen and the hydroxylate oxygen atoms.