Polyoxometalate coordinated transition metal complexes as catalysts: Oxidation of styrene to benzaldehyde/benzoic acid
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- 作者：SRINIVASA RAO AMANCHI ; ANJALI PATEL ; SAMAR K DAS
- 关键词：Heptamolybdate type polyoxometalate cluster anion ; transition metal coordination complexes ; oxidation of styrene ; hydrogen peroxide as an oxidant ; catalysis.
- 刊名：Journal of Chemical Sciences
- 出版年：2014
- 出版时间：November 2014
- 年：2014
- 卷：126
- 期：6
- 页码：1641-1645
- 全文大小：404 KB
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14. Sebastian J, Jinka K M and Jasra R V 2006 / J. Catal. 244 208 - 作者单位：SRINIVASA RAO AMANCHI (1)
ANJALI PATEL (2)
SAMAR K DAS (1)
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 - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Chemistry - 出版者：Springer India
- ISSN：0973-7103
文摘
Oxidation of styrene is carried out by using heptamolybdate coordinated transition metal (Co2+, Zn2+) complexes, [2-ampH]4[{Co(H2O)5}Mo7O24] ?H2O (1), [3-ampH]4[{Co(H2O)5}Mo7O24] ?H2O (2), [2-ampH]4[{Zn(H2O)5}Mo7O24] ?H2O (3) and [3-ampH]4[{Zn(3-ampy)(H2O)4}Mo7O24] ?H2O (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. Graphical Abstract Catalytic activities of compounds [2-ampH]4[{Co(H2O)5}Mo7O24]·9H2O (1), [3-ampH]4[{Co(H2O)5}Mo7O24]?H2O (2), [2-ampH]4[{Zn(H2O)5}Mo7O24]?H2O (3) and [3-ampH]4[{Zn(3-ampy)(H2O)4}Mo7O24]?H2O (4) have been performed in the conversion of styrene to benzaldehyde/ benzoic acid using H2O2 as an oxidant at a moderate temperature. These catalysts are able to recycle for minimum of three times with similar percentage of conversion.