Coordination Compounds of Cobalt, Nickel, and Copper with Some 4-(Salicylideneamino)benzenesulfonamides

摘要

N-(5-Ethyl-1,3,4-thiadiazol-2-yl)-4-(salicylideneamino)benzenesulfonamide(L~1), N-(1,3,.4-thiadiazol-2-yl)-4-(salicylideneamino)benzenesulfonamide (L~2), and N-(4-methoxypyridazin-2-yl)-4-(salicylideneamino)benxenesulfonamide(L~3)react with cobalt, nickel, and copper acetates in ethanl to give coordination compounds of the general formulas M(L~1-2H).nH_2O, and M(l~3-2H).nH_20(M = Co, Ni,Cu; n = 2-8). Similar reactions in the presence of pyridine (Py) (pH 8) gave complexes MPy_2(L~1-2H).nH_2O and MPy_2(L~2-2H).nH_2O (M = Co, Ni, Cu; n = 0,1). All the products are polynuclear coordination compounds, where Schiff bases L~1,L~2 and L~3 are bridging ligands which are linked with one central ion by the oxygen atom of the deprotonated hydroxy group and nitrotgen atoj of the azomethine moiety, and with the other, through the deprotonated thiazole(L~1 and L~2) or pyridazine(L~3) nitrogen atom and the sulfonamide oxygen atom. Thermolysis of the complexes includes dehydration (60-90 deg C), deaquation or deamination(140-240 deg C), and complete thermal decomposition(370-650 deg C).