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

Abstract

A novel 1-D coordination polymer {[Cu 2(L)(μ-1,3-C 4O 4)(ClO 4) 2]·1.33 H 2O} n ( C 4 O 4 2 - = 3 , 4 -dihydroxycyclobut- 3 - en - 1 , 2 -dionate , 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 ClO 4 - anion. The complex shows antiferromagnetic coupling between the squarato-bridged Cu(II) ions with J = −6.3 cm −1.