Oxidovanadium(V) complexes anchored on carbon materials as catalysts for the oxidation of 1-phenylethanol

Journal article (2016)

Authors

M. Sutradhar University of Lisbon
L.M.D.R.S. Martins Instituto Politécnico de Lisboa, University of Lisbon
S.A.C. Carabineiro Universidade do Porto
M.F.C. Guedes da Silva University of Lisbon
J.G. Buijnsters Micro and Nano Engineering - Mechanical, Maritime and Materials Engineering
JL Figueiredo Universidade do Porto
A.J.L. Pombeiro University of Lisbon
Research Group
Micro and Nano Engineering (Mechanical, Maritime and Materials Engineering) (TU Delft)
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Published Date

2016

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Precision and Microsystems Engineering

Research Group

Micro and Nano Engineering

Abstract

Six oxidovanadium(V) aroylhydrazone complexes derived from (3,5-di-tert-butyl-2-hydroxybenzylidene)-2-hydroxybenzohydrazide (H2L1) and (3,5-di-tert-butyl-2-hydroxybenzylidene)-2-aminobenzohydrazide (H2L2), namely, [VOL1(OEt)][VOL1(OEt) (EtOH)] (1), [VOL2(OEt)] (2), [Et3NH][VO2L1] (3), [VO2(HL2)]⋅2 EtOH (4), [(VOL1)2(μ-O)] (5), and [(VOL2)2(μ-O)] (6), were synthesized and characterized by elemental analysis, IR, 1H NMR, and 51V NMR spectroscopies, ESI-MS and, for 1–5, single-crystal XRD. The compounds have VO3+ (1 and 2), VO2+ (3 and 4), and V2O34+ (5 and 6) cores. They are active homogeneous catalysts in the microwave-assisted, solvent-free peroxidative oxidation of 1-phenylethanol to acetophenone by tBuOOH. The immobilization of the oxidovanadium complexes (1, 2, 4, and 5) on oxidized carbon materials improved the oxidation efficiency and allowed catalyst reuse with the preservation of activity.