Abstract
[MX(L)(PPh3)] (L=N-[(2-pyridyl)methyliden]-6-coumarin; M=Cu(I), Ag(I); X=Cl, Br, I, N3, SCN) are characterized by spectroscopic data. The X-ray structure of [CuCl(L)(PPh3)] shows CuN2PCl distorted tetrahedral coordination (L acts N,N chelator). The complexes show emission and the emission efficiency is dependent on nature of M and X; Cu(I) complexes (d10) are more emissive than Ag(I) complexes which may be due to heavy atom effect of silver. [Cu(SCN)(L)(PPh3)] shows highest emission intensity in the series. The cyclic voltammogram of [CuX(L)(PPh3)] shows Cu(II)/Cu(I) quasireversible redox couple while [AgX(L)(PPh3)] exhibits deposition of Ag(0) on the electrode surface together with irreversible ligand reduction. Coulometric oxidation of [CuX(L)(PPh3)] has synthesised copper(II) derivatives. Theoretical calculations are applied in modelling of complexes studied and UV–Vis spectra simulation.
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