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)]Г—5H
2O AND [Cu
2(mal)
2(atz)
2(H
2O)]Г—3H
2O
E.N. Nfor1, E.A. Eno2, J.N. Foba-Tendo1, G.E. Iniama2, E.O. Duke2, O.E. Offiong2
1University of Buea, Buea, SWR, Cameroon
nforemman@gmail.com
2University of Calabar, Calabar, CRS, Nigeria
Keywords: malonate, 1,2,4-triazole, carboxylate, crystal structures, magnetic properties
Abstract
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 Å and 3.640 Å 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.
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