Synthesis and characterization of polymeric Ni(II) complexes of 4-(4-aminobenzyl) benzenamine (abba) and 4-(4-aminophenylthio) benzenamine (aptba) with thiocyanate

Two one-dimensional complexes, [Ni(SCN)(2)(abba)(2)](n) (abba 4-(4-aminobenzyl) benzenamine) (1) and [Ni( SCN)(2)( aptba)(2)](n) (aptba 4-(4-aminophenylthio) benzenamine) (2), were synthesized and characterized by EA, IR, X-ray crystallography and thermal analysis. The single crystal X-ray structural analyses of 1 and 2 show the complexes to be 1D chain polymers as a result of dibenzenamine (dba) bridging. Each Ni is six-coordinate and adopts a slightly distorted octahedral geometry with four N atoms from four dba ligands and two N atoms from two NCS-groups. Adjacent Ni atoms and two dba ligands form a 24-membered macrocycle. Thermogravimetric analysis and differential thermogravimetric analysis of 2 show that the thermal decomposition of 2 includes four transitions.