Issue 38, 2018

Polyoxotungstates incorporated organophosphonate and nickel: synthesis, characterization and efficient catalysis for epoxidation of allylic alcohols

Abstract

Three new sandwich-type organophosphonate-functionalized polyoxotungstate clusters, [{Ni(H2O)5}x(AsW6O21)2{Ni(OOCCH2NCH2PO3)2}3] (x = 0 (Ni1), 1 (Ni2 and Ni3)), were successfully isolated via a “top-down” synthetic strategy. Compounds (Ni1–Ni3) were characterized by single crystal X-ray analysis, X-ray powder diffraction (XRPD), IR spectroscopy, UV-vis spectroscopy, and thermogravimetric analyses (TGA). Magnetic properties provide evidence for antiferromagnetic coupling in Ni2 and Ni3 and ferromagnetic interaction in Ni1. Catalytic studies of the three polyoxotungstates for the oxidation of allylic alcohols to epoxides have been investigated in water with H2O2 as the oxidant. All three polyoxotungstates exhibit efficient catalytic performance with excellent conversion and high selectivity at room temperature.

Graphical abstract: Polyoxotungstates incorporated organophosphonate and nickel: synthesis, characterization and efficient catalysis for epoxidation of allylic alcohols

Supplementary files

Article information

Article type
Paper
Submitted
25 Jun 2018
Accepted
23 Aug 2018
First published
23 Aug 2018

Dalton Trans., 2018,47, 13479-13486

Polyoxotungstates incorporated organophosphonate and nickel: synthesis, characterization and efficient catalysis for epoxidation of allylic alcohols

Q. Xu, Y. Li, R. Ban, Z. Li, X. Han, P. Ma, V. Singh, J. Wang and J. Niu, Dalton Trans., 2018, 47, 13479 DOI: 10.1039/C8DT02590H

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