Abstract
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.
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Acknowledgement
We thank Science & Engineering Research Board (a statutory body under the Department of Science and Technology), Government of India, for financial support (Project No. SB/SI/IC/034/2013). We also thank the Centre for Nano Technology, University of Hyderabad. The National X-ray Diffractometer facility at the University of Hyderabad by the Department of Science and Technology, Government of India, is gratefully acknowledged. ASR thanks CSIR, Government of India for a fellowship.
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FT-IR spectra, solid state UV spectra, powder X-ray crystallographic data of parent catalysts and used/ regenerated catalysts (compounds 1–4) and the results for the reactions of styrene oxidation with catalysts 1–4 are available in supplementary information at www.ias.ac.in/chemsci.
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AMANCHI, S.R., PATEL, A. & DAS, S.K. Polyoxometalate coordinated transition metal complexes as catalysts: Oxidation of styrene to benzaldehyde/benzoic acid. J Chem Sci 126, 1641–1645 (2014). https://doi.org/10.1007/s12039-014-0719-4
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DOI: https://doi.org/10.1007/s12039-014-0719-4