An azide-bridged copper(II) 1D-chain with ferromagnetic interactions: synthesis, structure and magnetic studies

A coordination polymer of formula [Cu(mu (1,3)-N-3)(2)(imH)(2)] (n) (1) has been synthesized by reaction of Cu(NO3)(2) with imidazole and sodium azide in CH3OH/CH3CN. The complex was characterized by FTIR, elemental analysis, powder diffraction, thermogravimetric analysis, magnetic measurements, and single-crystal X-ray diffraction. The X-ray crystal structure shows that the Cu(II) centers have a distorted octahedral coordination geometry, being coordinated by two imidazole ligands at the trans positions. Each azide links two [Cu(imH)(2)](2+) units to form 1D zigzag chains. Variable-temperature magnetic susceptibility studies at low field reveal dominant intrachain ferromagnetic/antiferromagnetic interactions. Using a model with n = 10, the coupling parameters J (AF) = -2.95 and J (F) = 17.99 with g = 2.12 have been determined.