Add time:07/12/2019         Source:sciencedirect.com

A series of copper(I) complexes of the formula [Cu(L)(PPh3)2]X (1–4) [where L = N-(2-pyridylmethylene)-1,5-dimethyl-2-pyrazole-3-(2H)-one; PPh3 = triphenylphosphine, X = Cl(1), ClO4(2), BF4(3) and PF6(4)] have been prepared by the condensation of 4-aminoantipyrine with pyridine-2-carboxaldehyde followed by reaction with CuCl, [Cu(MeCN)4]ClO4, [Cu(MeCN)4]BF4, [Cu(MeCN)4]PF6 in presence of triphenylphosphine as a coligand. A single crystal X-ray diffraction study of the representative complex [Cu(L)(PPh3)2]BF4 (3) reveals a distorted tetrahedral geometry around Cu(I). Complexes 1–4 exhibit quasireversible redox behavior corresponding to a Cu(I)/Cu(II) couple. All complexes show orange-red emission as a result of fluorescence from an intra-ligand charge transition (ILCT) with some metal to ligand charge transfer (MLCT) character. Significant increase in size of the counter anion shows marked effect on quantum efficiency and lifetime of the complexes. The catalytic efficiency of the complexes was tested and it was found that all the complexes worked as an effective catalyst in the Sonogashira coupling of phenylacetylene with aryl halides in good yield.

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