Heterobimetallic oxalato-bridged Cu(II)Re(IV) complexes. Synthesis, crystal structure and magnetic properties.

Three copper(II)−rhenium(IV) bimetallic complexes of formula [ReCl4(μ-ox)Cu(phen)2] (1), [ReCl4(μ-ox)Cu(phen)2]·CH3CN (2), and [ReCl4(μ-ox)Cu(terpy) (H2O)][ReCl4(μ-ox)Cu(terpy)(CH3CN)] (3) (ox = oxalate anion, phen = 1,10-phenanthroline, and terpy = 2,2‘:6,2"- terpyridine) have been synthesized and their crystal structures determined by single-crystal X-ray diffraction. Complex 1 crystallizes in the triclinic system, space group P(−1), with a = 9.776(2), b = 11.744(3), c = 14.183(3) A, α =102.09(2)°, β = 109.42(2)°, γ = 107.11(2)°, and Z = 2, whereas 2 and 3 crystallize in the monoclinic system, space groups P21/n and P21/c, respectively, with a = 12.837(3), b = 17.761(4), c = 12.914(3) A, β = 91.32(2)°, and Z = 4 for 2, and a = 8.930(2), b = 18.543(4), c = 27.503(6) A, β = 94.67(2)°, and Z = 4 for 3. The structures of 1 and 2 are made up of neutral [ReCl4(μ-ox)Cu(phen)2] bimetallic units. Re(IV) and Cu(II) metal ions exhibit distorted octahedral coordination geometries, being bridged by a bis(bidentate) ...