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Issue 13, 2017
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Mono-, tri- and polynuclear copper(II) complexes of Schiff-base ligands: synthesis, characterization and catalytic activity towards alcohol oxidation

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Abstract

Three new copper(II) complexes with different Schiff-base ligands, namely, [Cu(L1)Cl2] (1), [Cu3(L2)2Cl4] (2) and [Cu(L3)N3]n (3) where L1 = 2-morpholino-N-(pyridin-2-ylmethylene)ethanamine, HL2 = 4-bromo-2-((2-morpholinoethylimino)methyl)phenol and HL3 = 4-chloro-2-((2-(dimethylamino)ethylimino)methyl)phenol, have been synthesized and characterized by elemental analysis, standard spectroscopic methods, cyclic voltammometry and single crystal X-ray diffraction analysis. The X-ray diffraction analysis confirms the formation of mononuclear (1), trinuclear (2) and polynuclear (3) complexes. These complexes have been applied as catalysts for alcohol oxidation reactions using tert-butyl hydroperoxide (TBHP) as the terminal oxidant under mild conditions. The catalytic reaction mixture has been analyzed by gas chromatography and it shows that the mononuclear complex has the highest conversion while the other two complexes exhibit moderate catalytic activities. The corresponding aldehyde has been obtained as the sole product. The obtained catalysis results have been corroborated with electrochemical studies.

Graphical abstract: Mono-, tri- and polynuclear copper(ii) complexes of Schiff-base ligands: synthesis, characterization and catalytic activity towards alcohol oxidation

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Publication details

The article was received on 14 Mar 2017, accepted on 19 May 2017 and first published on 25 May 2017


Article type: Paper
DOI: 10.1039/C7NJ00846E
Citation: New J. Chem., 2017,41, 5696-5706
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    Mono-, tri- and polynuclear copper(II) complexes of Schiff-base ligands: synthesis, characterization and catalytic activity towards alcohol oxidation

    A. Bhattacharjee, S. Halder, K. Ghosh, C. Rizzoli and P. Roy, New J. Chem., 2017, 41, 5696
    DOI: 10.1039/C7NJ00846E

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