Synthesis, structural analysis and evaluation of the catalytic activity of a non-symmetric N-(salicylidene)diethylenetriamine complex of copper(II)

doi:10.1016/S1872-2067(12)60616-0

Abstract

Abstract: A new copper(II) complex of a non-symmetric Schiff base, [Cu^II(saldien)(H₂O)]⁺ (1), has been synthesized and characterized by elemental analysis and several other spectroscopic methods (Hsaldien = N-(salicylidene)diethylenetriamine). The crystal structure of 1 has also been determined by X-ray crystallography. The geometry of the complex cation in 1 was found to be distorted square pyramidal with the mononegative Schiff base coordinating to the copper in a tetradentate mode via the O,N,N', and N''-donor atoms. The remaining coordination site was occupied by the O atom of a H₂O molecule in the axial position. The catalytic potential of 1 was tested in the oxidation reactions of cyclooctene and cyclohexene with aqueous 30% H₂O₂/NaHCO₃ in acetonitrile. These reactions proceeded smoothly to give the corresponding epoxides with selectivity levels greater than 99%. This catalytic system also showed high levels of activity and selectivity towards the oxidation of cyclohexane (i.e., cyclohexanol 37% and cyclohexanone 54%) in comparison with most of the other Cu-based systems reported in the literature.

Key words: Crystal structure, Copper(II) complex, Non-symmetric Schiff base, Catalyst, Hydrogen peroxide

Hassan HOSSEINI-MONFARED, Sohaila ALAVI, Milosz SICZEK. Synthesis, structural analysis and evaluation of the catalytic activity of a non-symmetric N-(salicylidene)diethylenetriamine complex of copper(II)[J]. Chinese Journal of Catalysis, DOI: 10.1016/S1872-2067(12)60616-0.

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