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Homogeneous and heterogeneous styrene epoxidation catalyzed by copper(II) and nickel(II) Schiff base complexes

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Abstract

Both monomeric Schiff base complexes and 1D helical polymeric complexes of Cu(II) and Ni(II) were synthesized and characterized by physicochemical and spectroscopic methods. X-ray single-crystal studies were made on [K2(CuL)2Ni(CN)4]n·0.5nEt2O and [K2(NiL)2Ni(CN)4]n·0.5nEt2O. The polymers were screened as heterogeneous catalysts for styrene epoxidation. For comparison, the catalytic properties of the homogeneous and heterogeneous catalysts were also examined under identical reaction conditions, and the influence of various solvents and oxidants was studied. The polymeric catalysts showed better activities in chloroform when using tert-butyl hydroperoxide as oxidant, suggesting that heterogenization increased the activity of the catalyst under this condition.

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Acknowledgments

This work was supported by the National Natural Science Foundation (21373160, 21173165), the Program for New Century Excellent Talents in University from the Ministry of Education of China (NCET-10-0936), the research fund for the Doctoral Program (20116101110003) of Higher Education of China, the Scientific Research Program Foundation of Shaanxi Provincial Education Department (2013JK0701, 2012JK0577), and the Scientific Research Culture Foundation of Xi’an University of Science and Technology (201117).

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Correspondence to Deng-Feng Liu or Xing-Qiang Lü.

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Liu, DF., Lü, XQ. & Lu, R. Homogeneous and heterogeneous styrene epoxidation catalyzed by copper(II) and nickel(II) Schiff base complexes. Transition Met Chem 39, 705–712 (2014). https://doi.org/10.1007/s11243-014-9853-6

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  • DOI: https://doi.org/10.1007/s11243-014-9853-6

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