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Issue 89, 2014
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A cyclic tetranuclear cuboid type copper(II) complex doubly supported by cyclohexane-1,4-dicarboxylate: molecular and supramolecular structure and cyclohexane oxidation activity

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Abstract

Synthesis, characterization and catalytic study of the new bis(μ4-(ae)-cyclohexane-1,4-dicarboxylato-O,O′,O′′,O′′′)-tetracopper(II) complex [(CuL)24-O,O′,O′′,O′′′-CDC)]2·2H2O (1) (HL = 2-(2-pyridylmethyleneamino)benzenesulfonic acid and CDC = cyclohexane-1,4-dicarboxylate) are described. Complex 1 contains four copper(II) centres connected by four Schiff base ligands (L) and doubly bridged by two cyclohexane-1,4-dicarboxylate moieties. The axial-equatorial conformation of the carboxylate groups of CDC stabilizes a tetracopper di-CDC ring in a cuboid type fashion. Compound 1 is applied as an efficient pre-catalyst for the oxidation of cyclohexane by aqueous H2O2 under mild conditions (50 °C) in CH3CN/H2O medium. Without any promoter, a total yield (based on substrate) of cyclohexanol and cyclohexanone up to 35% was achieved.

Graphical abstract: A cyclic tetranuclear cuboid type copper(ii) complex doubly supported by cyclohexane-1,4-dicarboxylate: molecular and supramolecular structure and cyclohexane oxidation activity

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Publication details

The article was received on 11 Jul 2014, accepted on 18 Sep 2014 and first published on 07 Oct 2014


Article type: Paper
DOI: 10.1039/C4RA06986B
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2014,4, 48449-48457
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    A cyclic tetranuclear cuboid type copper(II) complex doubly supported by cyclohexane-1,4-dicarboxylate: molecular and supramolecular structure and cyclohexane oxidation activity

    S. Hazra, S. Mukherjee, M. F. C. Guedes da Silva and A. J. L. Pombeiro, RSC Adv., 2014, 4, 48449
    DOI: 10.1039/C4RA06986B

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