DI-2-PYRIDYLKETONE SEMICARBAZONE AS LIGAND IN METAL-COMPLEXES - SYNTHESIS AND X-RAY CRYSTAL-STRUCTURE

A series of complexes of di-2-pyridylketone semicarbazone (Hdips) and Mn(ZI), Co(III), Co(m), Ni(II)) and Cu(II) nitrates were synthesized a nd characterized by means of IR spectroscopy and for cobalt and nickel by X-ray crystal structures. The results are in agreement with the fo rmulae: Mn(Hdips)(2)(NO3)(2).2H(2)O, [Co(Hdips)(2)](NO3)(2).H2O (I), [ Ni(Hdips)(2)](NO3)(2).H2O Cu(Hdips)(NO3)(2).2H(2)O, [Co(dips)(2)](NO3) .2H(2)O (m). The structure of I and II are monoclinic, space group P2( I)/c, with, I, a=15.980(4), b=11.531(2), c=16.170(2)Angstrom; beta=104 .20(2)degrees, Z=4, R=0.032; II, a=16.109(5), b=11.480(3), c=16.135(6) Angstrom; beta=104.15(2)degrees, Z=4, R=0.069. Compound III is also mo noclinic, space group P2(I)/c with a=12.173(5), b=15.619(5), c=15.338( 8)Angstrom; beta=111.40(4)degrees, Z=4, R=0.059. In these complexes th e ligand is tridentate via carbonylic oxygen, semicarbazone and pyridi ne nitrogens forming each two five membered chelate rings with the met al in a distorted octahedral geometry.