Synthesis, structural characterization and magnetic properties of one-dimensional Cu(II)-azido coordination polymers

Abstract

Four 1D coordination polymers catena-[Cu(4-HOCH2py)(μ1,1-N3)(μ1,3-N3)] (1), catena-[Cu(3-MeOpy)2(µ1,1-N3)2] (2), catena-[Cu(2-Br-4-Mepy)(µ1,1-N3)2] (3) and catena-[Cu(μO,O-2-Cl-6-Menic)(μ1,1-N3)(MeOH)] (4) where 4-HOCH2py, 3-MeOpy, 2-Br-4-Mepy and 2-Cl-6-Menic represent 4-pyridylmethanol, 3-methoxypyridine, 2-bromo-4-methylpyridine and 2-chloro-6-methyl nicotinate anion, respectively have been synthesized, and structurally and magnetically characterized. Variable temperature magnetic susceptibility measurements over the temperature range 4.5–300 K revealed weak to moderate ferromagnetic coupling on going from complexes 1 (J = 10.1 cm−1) and 3 (J = 16 cm−1) to 4 (J = 51.1) cm−1. On the other hand, complex 2 displayed weak antiferromagnetic coupling (J = −3.82 cm−1). The magnetic properties of the complexes are discussed in relation to the structural parameters of the bridging ligands.