Hydrothermal synthesis and structural characterization of the first mixed molybdenum-tungsten capped-keggin polyoxometal complex: {[Co(dien)]4[(AsVO4)MoV8WVI4O33(micro2-OH)3]}.2H2O.

The first polyoxometal complex possessing affirmatory mixed molybdenum-tungsten capped Keggin-type structure has been hydrothermally synthesized.

Hydrothermal syntheses and structural characterizations of organic-inorganic hybrid materials of the M(II)-ligand/vanadium oxide system (M(II) = Mn(II), Cu(II) and Zn(II); ligand = 2,2'-bipyridine and 1,10-phenanthroline).

Three organic-inorganic hybrid compounds [Mn(bpy)V(bpy)V(3)O(11)] (bpy = 2,2'-bipyridine) (1), [Cu(bpy)V(2)O(6)] (2) and [Zn(phen)3][V(2)O(6)].10H(2)O (phen = 1,10-phenanthroline) (3) have been synthesized hydrothermally. Single crystal X-ray diffraction analyses revealed that compound 1 is the first example of bpy units coordinating to different transition metals in one molecule. Compound 2 is a new isomer of [Cu(bpy)V(2)O(6)] which was named the gamma-isomer by us. In compound 3, a 2-D water sheet with big holes filled by the "naked" [V(4)O(12)](4-) clusters is found.