Crystal structure and magnetic behavior of Cu-3(O2C16H23)(6) center dot 1.2 C6H12. An unexpected structure and an example of spin frustration
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abstract
A copper(II) carboxylate has been obtained from the reaction of basic copper carbonate, CuCO3.Cu(OH)2, with 2,4,6-triisopropylbenzoic acid. It contains a trinuclear CU36+ core with three-fold symmetry, with each pair of copper atoms bridged by two carboxylate ligands. The Cu..Cu separations are 3.131(3) , precluding any direct bonding. Magnetic susceptibility data from 1.8 to 380 K at 1 000 G indicate a doublet ground state, (g 2.1) between 10-50 K (eff = 1.80 B). Above 50 K, the magnetic moment increases to 2.69 B at 380 K, as expected for an equilateral triangular system of CuII with antiferromagnetic interactions between spin carriers. 2001 Acadmie des sciences/ ditions scientifiques et mdicales Elsevier SAS.