A novel 1-D coordination Cu(II) polymer with alternating μ1,3-squarato and binucleating polypyridylamine bridges

A novel 1-D coordination polymer {[Cu2(L)(μ-1,3-C4O4)(ClO4)2]·1.33 H2O}n (image, L = 1,3-bis[bis(2-pyridylmethyl)aminomethyl]benzene was synthesized and structurally characterized by X-ray crystallography. The spectral and structural characterization, electrochemical and magnetic properties as well as thermo gravimetric analyses are reported. The structure of the complex consists of the ligand L bound to two Cu(II) centers and a bridging squarato in the 1,3-bonding mode. The coordination geometry around the Cu(II) centers is a five-coordinate with a slightly distorted square pyramidal environment which is achieved by the three N-donor atoms of each arm of the ligand L, an oxygen atom of the bridging squarato moiety and by an oxygen atom of the image anion. The complex shows antiferromagnetic coupling between the squarato-bridged Cu(II) ions with J = −6.3 cm−1.