Crystal structure and magnetic properties of the coupled spin dimer compound SrCu2(TeO3)(2)Cl-2

摘要

Single crystals of the strontium copper tellurium oxochloride SrCu2,(TeO3)(2)C]2 were synthesized via solid-gas reactions in sealed evacuated silica tubes. The compound crystallizes in the monoclinic system, space group P2(1), a = 7.215(2), b = 7.2759(15), c = 8.239(2) angstrom, beta = 96.56(4)degrees, Z = 2. The building units are [SrO6Cl2] irregular polyhedra, [CuO4] and [CuO3Cl] square planes, [TeO3E] tetrahedra and [TeO3+1E] trigonal bipyramids; E being the 5s(2) lone pair of Te(W). The Cu atoms can be regarded as forming a chain of weakly connected dimers. The magnetic susceptibility of the compound shows a broad maximum typical for antiferromagnetic spin fluctuations with a non-magnetic ground state. A Heisenberg spin model with coupled s = 1/2 dimers leads to a satisfactory fitting of the experimental data. (c) 2006 Elsevier Inc. All rights reserved.