The reaction of [Ni(L)]Cl2·2H2O (L = 3.14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,01.18,07.12]docosane) with malonic (H2mal) acid yields a one-dimensional coordination polymer [Ni(L)(mal)2]n (1). The structure was characterized by X-ray crystallography, spectroscopic and magnetic susceptibility. Each nickel(II) ion has a distorted octahedral coordination environment with the four secondary amines of the macrocycle in which two carboxylate anions of the malonate ligand have assembled around each nickel center. The compound crystallizes in the monoclinic system C2/c with a = 19.487(4), b = 8.4143(12), c = 14.6036(18) Å, β = 102.232(11)°, V = 2340.2(6) Å3, Z = 4. Electronic spectrum of 1 exhibits a high-spin octahedral environment. The magnetic behavior of 1 reveals a weak intramolecular antiferromagnetic interaction with J values of −1.91(1) cm−1.
Graphical Abstract
The cationic units in complex 1 are bridged by carboxylate anions to give a one-dimensional coordination polymer in which each nickel(II) ion has a distorted octahedral coordination environment.