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Heptamolybdate type polyoxometalate cluster anion; transition metal coordination complexes; oxidation of styrene; hydrogen peroxide as an oxidant; catalysis.

Oxidation of styrene is carried out by using heptamolybdate coordinated transition metal (Co²⁺, Zn²⁺) complexes, [2-ampH]₄[{Co(H₂O)₅}Mo₇O₂₄]·9H₂O (1), [3-ampH]₄[{Co(H₂O)₅}Mo₇O₂₄]·9H₂O (2), [2-ampH]₄[{Zn(H₂O)₅}Mo₇O₂₄]·4H₂O (3) and [3-ampH]₄[{Zn(3-ampy)(H₂O)₄}Mo₇O₂₄]·4H₂O (4) as catalysts and H₂O₂ as an oxidant at 80°C. The leaching study has been carried out to check the quality of catalyst and it has been reused for three times with good percentage of conversion. For the first two catalysts (compounds 1 and 2), the major product obtained is benzaldehyde, and benzoic acid is the major product for next two catalysts (compounds 3 and 4). Stability of the catalysts has been analyzed by IR, UV-spectroscopy and powder X-ray crystallography.

Srinivasa Rao Amanchi¹ Anjali Patel² Samar K Das¹

1. School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
2. Chemistry Department, Faculty of Science, M. S. University of Baroda, Vadodara 390 002, India

Published

November 2014

Manuscript received

16 January 2014

Manuscript revised

5 April 2014

Accepted

28 April 2014

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