Abstract
The synthesis, characterization and X-ray structure determination of [Cu 3(metz) 6(H 2O) 4] (CF 3SO 3) 6(H 2O) 4 is described. The compound crystallizes in the space group R 3 , with a = b = 14.075(3) and c = 34.655(8) Å. The complex cation consists of linear trinuclear clusters positioned on the crystallographic three-fold axis, and in which the Cu atoms are bridged by triple N 1,N 2-coordinating triazole ligands. The terminal copper atoms are in addition coordinated by two water molecules, and thus have a distorted tetragonal pyramidal geometry. The central copper ion is located at a three-fold inversion center and thus should exhibit dynamic Jahn-Teller behaviour. In the crystal one observes the average of three such trimers related by the three-fold axis, and due to this disorder and also to that in the triflate anions, the structure could be refined only to R = 0.17 ( R w = 0.20). The infrared and ligand-field spectroscopic data and magnetic susceptibility are in agreement with the observed structure.
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