Issue 38, 2017

Synthesis, characterization and catalytic epoxidation properties of lanthanide-stabilized peroxoisopolytungstates

Abstract

A series of new lanthanide-containing peroxoisopolyoxotungstates, K6Na4[H32{Ln4(WO4)(H2O)16[W7O22(O2)2]4}3]ยท105H2O [Ln = CeIII (1), NdIII (2), SmIII (3), TbIII (4), ErIII (5)], have been successfully synthesized and structurally characterized. All polyanions [LnIII4(WO4)(H2O)16{W7O22(O2)2}4]14โˆ’ are isostructural and consist of a central [LnIII4(WO4)(H2O)16]10+ cluster surrounded by four peripheral [W7O22(O2)2]6โˆ’ units. They could act as efficient recyclable catalysts for the epoxidation of various alkenes including different cycloalkenes, styrene derivatives, internal and long-chain alkenes. Under optimal conditions, catalyst 2 displays the best catalytic activity for the oxidation of cyclooctene with high cyclooctene conversion (98.3%) and excellent selectivity (up to 99%) and could be reused for three cycles with a negligible decrease in reactivity.

Graphical abstract: Synthesis, characterization and catalytic epoxidation properties of lanthanide-stabilized peroxoisopolytungstates

Supplementary files

Article information

Article type
Paper
Submitted
07 Jul 2017
Accepted
31 Aug 2017
First published
31 Aug 2017

Dalton Trans., 2017,46, 12981-12987

Synthesis, characterization and catalytic epoxidation properties of lanthanide-stabilized peroxoisopolytungstates

J. Guo, Y. Niu, L. Song, Q. Xu, J. Lu, P. Ma, D. Zhang, C. Zhang, J. Niu and J. Wang, Dalton Trans., 2017, 46, 12981 DOI: 10.1039/C7DT02471A

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