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Issue 12, 2012
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Dinickel(II) complexes: Preparation and catalytic activity

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Abstract

Ligands (La–c) based on 2,7-bis(3,5-di-R-pyrazol-1-yl)-1,8-naphthyridine (a, R = H; b, R = CH3; c, R = Ph) were prepared for the construction of a series of dinickel complexes. Treatment of Lx with NiCl2 in an anhydrous methanol/THF solution resulted in the formation of dinuclear complexes [(Lx)(μ-Cl)2Ni2Cl2(CH3OH)2] (3, x = a; 4, x = b; 5, x = c). These new complexes were characterized by elemental analysis, IR and UV–Vis spectroscopic techniques. The structures of complexes 3 and 4 were further confirmed by X-ray diffraction studies. Interestingly, crystals of 4 were obtained as a co-crystallization of 4 and the methanol substituted species [{(Lb)(μ-Cl)2Ni2Cl(CH3OH)3}Cl] (4′). These dinickel complexes have been tested in the catalytic homo-coupling of terminal alkynes with the use O2 as the oxidant, showing excellent activities. A clear improvement on the catalytic activity of these complexes is observed as compared to the mono-nuclear species.

Graphical abstract: Dinickel(ii) complexes: Preparation and catalytic activity

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Publication details

The article was received on 25 Jul 2011, accepted on 23 Dec 2011 and first published on 03 Feb 2012


Article type: Paper
DOI: 10.1039/C2DT11398H
Citation: Dalton Trans., 2012,41, 3468-3473
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    Dinickel(II) complexes: Preparation and catalytic activity

    T. Cheng, B. Liao, Y. Liu, S. Peng and S. Liu, Dalton Trans., 2012, 41, 3468
    DOI: 10.1039/C2DT11398H

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