Abstract
A novel tricopper bridged oxalato complex with the structural formula [Cu(tacp)(H2O)]2[Cu(μ2-C2O4)2(ClO4)2] (1) where tacp=1,4,8,12-tetraazacyclopentadecane was synthesized. The complex was characterized by X-ray crystallography and by spectroscopic techniques (IR and visible). The magnetic properties were also measured at variable temperatures (300–2K). In this compound each oxalate is acting as a bridging ligand between two Cu2+ ions, where two types of coordination modes are found for the oxalate: monodentate and bidentate fashions. The magnetic coupling between the Cu–Cu centers is very weak antiferromagnetic (the singlet–triplet energy coupling J=−0.9cm−1) and is in full agreement with the structural results.
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