P. Mukherjee, T. Maji, G. Mostafa
Jan 24, 2001
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Journal
Inorganic Chemistry
Abstract
The reaction of CuCl2·2H2O and Na2C4H2O4 (disodium fumarate) in dilute ammonia solution produces 1-D polymeric chain [Cu(μ-C4H2O4)(NH3)2]n(H2O)n. The crystal structure of the compound has been solved. The compound crystallizes in the monoclinic system, space group C2/m (No. 12), with chemical formula C4H10N2O5Cu, a = 13.955(5) A, b = 7.330(3) A, c = 8.927(2) A, β = 102.39(3)°, Z = 4. The interesting feature of the complex is that one of the carboxylic acid groups acts as a monodentate coordinating ligand whereas the remaining carboxylate moiety acts as a monoatomic bridging bidentate ligand. This unusual coordination behavior of fumarate anion produces a chain with alternate repetition of 4- and 14-member rings. The magnetic properties of the compound have been studied from room temperature to 4 K, which reveal the existence of a dominant ferromagnetic interaction with exchange coupling parameter values of JF = +12 cm-1 and JAF = −3.8 cm-1, using an alternating ferro- and antiferromagnetic chain model for...