Novel Copper-Complex-Substituted Tungstogermanates.

Two copper-complex-substituted tungstogermanates [Cu5(2,2′-bpy)6-(H2O)][GeW8O31]•9H2O, 1, and {[Cu5(2,2′-bpy)5(H2O)][GeW9O34]}2• 7H2O, 2 (2,2′-bpy = 2,2′-bipyridyl), have been hydrothermally synthesized and structurally characterized. X-ray structural analyses show that 1 is a rare tetralacunary Keggin anion of [B-β-GeWBO31]10- substituted by copper complexes, while dimer 2 consists of two trilacunary [B-α-GeWgO34]10- Keggin units bridged by copper complexes. Magnetic measurement for 2 shows the presence of antiferromagnetic interactions within the dinuclear Cu2+ cations. [ABSTRACT FROM AUTHOR]