Abstract
The crystal structure of the carboxylic acid adduct of a tetracarboxylate-bridged dimeric species, [Cu2(RCO2)4(RCO2H)2], where RCO2H = 2-phenoxybenzoic acid, has been determined by X-ray diffraction and refined to a residual R = 0.037 for 2827 observed reflections. The centrosymmetric dimer has a CuCu separation of 2.602(1) Å, a mean CuO (plane) bond length of 1.960(3) Å and a CuO (axial) length of 2.182(3) Å, to the adducted acid molecule. The acid proton is hydrogen bonded to a cage carboxylate oxygen (O---O, 2.64(1) Å).
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