Coordination compounds of cobalt, nickel, copper and zinc with thiosemicarbazone and 3-phenylpropenal semicarbazone

Hydrates of 3-phenylpropenal thiosernicarbazone (HL center dot H2O) and semicarbazone (HL'center dot H2O) react in methanol with cobalt, nickel, copper, and zinc chlorides, nitrates, and acetates to form coordination compounds MX2 center dot 2HL center dot nSolv [M = Co, Ni, Cu, Zn; X = Cl, NO3; HL = C6H5CH=CH-CH=N-NHC(O)NH2; n = 0-3; Solv = H2O, CH3OH], CuX2 center dot HL center dot nH(2)O [M = Ni, Cu; n = 0, 1], ML2 - nH(2)O and ML' center dot nH(2)O [M = Co, Ni, Zn; HL' = C6H5CH=CH-CH=N-NHC(O)NH2; n = 0-3]. In the presence of amines (A = C2H5N, 2-CH3C5H4N, 3-CH3C5H4N, and 4-CH3C5H4N) these reactions yield the complexes Cu(A)LCl center dot CH3OH and M(A)LX - nH(2)O [M = Cu, Ni; X = Cl, NO3; n = 0-2]. The copper complexes with the amine ligands are of polynuclear structure, and other complexes are monomeric. Carbazones (HL and HL') are included in the complexes as bidentate N,S- and N,O-ligands. The thermolysis of the complexes involves the stages of removing solvent crystallization molecules (70-90 degrees C), deaquation (150-170 degrees C), and full thermal decomposition (500-580 degrees C).