Hydrothermal syntheses, crystal structures, and properties of two polyoxometalates [Cd(2,2′-bpy)3]2[PMoVMoVI 11O40] and [H3PMo12O40]·3(4,4′-bpy)·4H2O

Abstract

Two Keggin-type phosphododecamolybdate compounds [Cd(2,2 -bpy) 3 ] 2 [PMo V Mo VI 11 O 40 ] (1) and [H 3 PMo 12 O 40 ]·3(4,4 -bpy)·4H 2 O (2) (bpy= bipyridine) were prepared by the hydrothermal method for the first time and characterized by elemental analyses, X-ray singlecrystal diffraction, ESR spectra, and IR spectra, showing that compound 1 consists of a mixed valence Keggin polyanion [PMo V Mo VI 11 O 40 ] 4-and two isolated coordinated cations [Cd(2,2 -bpy) 3 ] 2+ , while compound 2 is an intermolecular compound based on organic substrate 4,4 -bpy and heteropoly acid unit H 3 PMo 12 O 40 . Furthermore, both the compounds show strong photoluminescence properties in the solid state at room temperature. The catalytic activities of the two compounds were also determined by the oxidation of benzaldehyde to benzoic acid using H 2 O 2 as oxidant in a liquid-solid triphase system.

Interplay of thermochemistry and Structural Chemistry, the journal (volume 17, 2006) and the discipline

“…The following paper by Lan et al [27] focuses on polyoxometalates which have become a focus of contemporary chemical research due to their structural diversity and potential applications in many areas such as catalysis, photochemistry, and magnetism. Two new polyoxometalates [Cd(2,2 0 -bpy) 3 ] 2 [PMo(V)Mo(VI) 11 O 40 ] and [H 3 PMo 12 O 40 ]Á3(4,4 0 -bpy)Á4H 2 O (bpy = bipyridyl) were synthesized and their structures determined.…”