An antimony-substituted polyoxomolybdate, [PSbIII(H2O) -Mo11O39]4-, of the α-Keggin structure, has been synthesized. Although the molecular structure is typical, we have found from the analysis of the X-ray diffraction data that the crystal is anisotropic with alignment of the molecular units so that the substituted antimony atoms are all directed along the polar c axis and on the same side of the molecular unit. UV/Vis, ESR and magnetic susceptibility data support a formulation of [PSbIII(H2O)Mo11O39]4- whereby there is partial electron delocalization with some formation (10-20%) of MoV. Oxidation of [PSbIII(H2O)Mo11O39]4- with ozone or bromine yields the oxidized species [PSbV(O)Mo11O39]4- and [PSbV(Br)Mo11O39]3-. In the anaerobic oxydehydrogenation of alcohols, [PSbV(O)Mo11O39]4- is more active than [PSbV(Br)Mo11O39]3-. Catalytic aerobic oxidation of benzylic alcohols to aldehydes was also possible with no over-oxidation and formation of carboxylic̈ acids.
|Number of pages||6|
|Journal||European Journal of Inorganic Chemistry|
|Publication status||Published - 2001|
ASJC Scopus subject areas
- Inorganic Chemistry