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

Abstract

Hydrates of 3-phenylpropenal thiosemicarbazone (HL·H 2 O) and semicarbazone (HL′·H 2 O) react in methanol with cobalt, nickel, copper, and zinc chlorides, nitrates, and acetates to form coordination compounds MX 2 ·2HL· n Solv [M = Co, Ni, Cu, Zn; X = Cl, NO 3 ; HL = C 6 H 5 CH=CH-CH=N-NHC(O)NH 2 ; n = 0–3; Solv = H 2 O, CH 3 OH], CuX 2 ·HL· n H 2 O [M = Ni, Cu; n = 0, 1], ML 2 · n H 2 O and ML′· n H 2 O [M = Co, Ni, Zn; HL′ = C 6 H 5 CH=CH-CH=N-NHC(O)NH 2 ; n = 0–3]. In the presence of amines (A = C 5 H 5 N, 2-CH 3 C 5 H 4 N, 3-CH 3 C 5 H 4 N, and 4-CH 3 C 5 H 4 N) these reactions yield the complexes Cu(A)LCl·CH 3 OH and M(A)LX· n H 2 O [M = Cu, Ni; X = Cl, NO 3 ; 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°C), deaquation (150–170°C), and full thermal decomposition (500–580°C).