Copper(II) malonate coordination frameworks with amino-1,2,4-triazole: Crystal structures and magnetic properties of [Cu_2(mal) _2(datz)_2(H_2O)]·5H_2O and [Cu_2(mal)_2(atz)_2(H_2O)] ·3H_2O

摘要

Two new malonato-bridged copper(II) complexes of the composition [Cu _2(mal)_2(datz)_2(H_2O)]·5H _2O (1) and [Cu_2(mal)_2(atz)_2(H _2O)]·3H_2O (2) (mal = malonate, atz = 4-amino-1,2,4-triazole, datz = 3,5-diamino-1,2,4-triazole) are prepared and characterized by X-ray crystal structure determination and magnetic studies. The environment of each copper atom in 1 and 2 has distorted square pyramidal and octahedral geometries. The intrachain copper-copper separation is 6.305 ? and 3.640 ? across the carboxylates and trizolates bridges respectively for complexes 1 and 2. The magnetic properties of 1 and 2 are investigated in the temperature range 2-300 K. The overall antiferromagnetic behavior is observed in both cases.