Tetranuclear copper(ii)–Schiff-base complexes as active catalysts for oxidation of cyclohexane and toluene
- 15 December 2009
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Dalton Transactions
- Vol. 39 (6), 1539-1545
- https://doi.org/10.1039/b914017d
Abstract
Three new Cu(II) complexes, [Cu4(O)(Ln)2(CH3COO)4] where HL1 = 4-methyl-2,6-bis(2-fluoroethyliminomethyl) phenol for complex 1, HL2 = 4-methyl-2,6-bis(2-chloroethyliminomethyl) phenol for complex 2·0.25CH3CN and HL3 = 4-methyl-2,6-bis(2-bromoethyliminomethyl) phenol for complex 3 have been synthesized and characterized by elemental analysis, FTIR, UV-vis spectroscopy, and electrospray ionization mass spectroscopy. The structure of complex 2·0.25CH3CN has also been confirmed by single crystal X-ray diffraction analysis. These complexes have been found to be active catalysts for the oxidation of cyclohexane and toluene in the presence of hydrogen peroxide as the oxidant under mild conditions. Cyclohexane is oxidized to yield cyclohexanol and cyclohexanone, whereas toluene is oxidized to benzyl alcohol and benzaldehyde.Keywords
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