Two new NiII complexes with μ1,5-dicyanamide as bridging ligand

Abstract

One 3D and one 2D μ1,5-dicyanamide bridged NiII complexes having molecular formula [Ni(L1)(dca)2] (1) and [Ni2(L2)2(dca)4] · 0.5H2O (2) (L1 = 4-(2-aminoethyl)-morpholine, L2 = 1-(2-aminoethyl)-piperidine and dca = dicyanamide dianion) have been synthesized. X-ray single crystal analyses and low temperature magnetic measurements were used to characterize the complexes. Complex 1 represents a 3D structure where each metal ion is chelated by morpholine ligand (L1) and connected by four μ1,5-dca. Whereas complex 2 shows an undulated 2D structure with grid of (4,4) topology having two crystallographically independent NiII centers in similar octahedral environment where each metal center is chelated by one piperidine ligand (L2) and coordinated by four μ1,5-dca. Magnetic measurements of both the complexes indicate weak antiferromagnetic interactions through the μ-1,5-dca bridging ligands.