A tetrahedrally distorted mononuclear copper(n) complex, [Cu(salabza)] 1, and two dinuclear CuLn complexes, [Cu(salabza)Ln(hfac)3] (Ln = Gd 2 or Lu 3), were synthesized and their molecular structures determined, where H2salabza and Hhfac denote N,N′-bis(salicylidene)-2-aminobenzylamine and 1,1,1,5,5,5-hexafluoroacetylacetone, respectively. In complex 1 the deviations of the four co-ordinating atoms (O(1), O(2), N(1)and N(2)) of salabza2- and the copper atom from the least-squares equatorial plane O(1)O(2)N(1)N(2) indicate the tetrahedral distortion around Cu. In 2 and 3 the CuII and LnIII are bridged by the two phenolic oxygens of salabza2-. The Cu ⋯ Ln distances are 3.2481(8) Å for 2 and 3.1825(7) Å for 3. The structures of 2 and 3 were found to consist of a perfectly discrete dinuclear CuLn unit, the shortest intermolecular Cu⋯Cu, Cu⋯Ln and Ln⋯Ln distances being 6.002(1), 7.522(1) and 8.507(1) Å for 2, and 5.998(1), 7.509(1) and 8.584(1) Å for 3, respectively. Cryomagnetic susceptibility measurements of 2 in the region of 2 K to room temperature indicated the operation of a ferromagnetic interaction between CuII and GdIII, with J= +0.8 cm-1 based on H= -2JSCu·SGd. This was confirmed by measurements of the field dependence of magnetization at 2 K.
|Number of pages||5|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - Jan 1 2000|
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