ISSN:
1572-901X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary Three new CuII trinuclear complexes, namely [Cu3(BZT)(phen)3(ClO4)3]·6H2O (1), [Cu3(BZT)(Nphen)3 (ClO4)3]·6H2O (2) and [Cu3(BZT)(bipy)3 (ClO4)3]·3H2O (3) (BZT) = 1,3,5-benzenetricarboxylato, phen = 1,10-phenanthroline, Nphen = 5-nitro-1,10-phenanthroline, bipy = 2,2-bipyridyl, have been synthesized, with 1,3,5-benzenetricarboxylato as the bridged ligand, and characterized by elemental analysis, and i.r. and electronic reflection spectra. We propose that the complexes have an extended 1,3,5-benzenetricarboxylatobridged structure containing three CuII atoms. The variable-temperature magnetic susceptibilities of the complexes were measured in the 77–300 K range. The magnetic coupling parameters are consistent with an antiferromagnetic exchange model based on the Hamiltonian operator [Ĥ=−2J(Ŝ 1 Ŝ 2+Ŝ 1 Ŝ 3+Ŝ 2 Ŝ 3, where S 1=S 2=S 3=1/2, giving the antiferromagnetic coupling parameters of 2J = − 18.6 cm-1 for (1)–(3).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00229702
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