Research paperStructure, spectra and electrical conductivity of copper(I) and silver(I) phosphino bridging mixed ligand complexes with coumarinyl Schiff base

Add time:08/29/2019    Source:sciencedirect.com

Coordination polymers, [–M(L)(μ-dppp/dppb/dpph)–]n(X)n, (M = Cu(I), Ag(I); L, N-{(2-pyridyl)methyliden}-6-coumarin; X = NO3− or ClO4−; dppp, 1,3-bis(diphenylphosphino)propane; dppb, 1,4-bis(diphenylphosphino)butane; dpph, 1,6-bis(diphenylphosphino)hexane) have been spectroscopically characterised and one of the complexes, [–Ag(L)(μ-dpph)–]n(NO3)n has been structurally supported by single crystal X-ray diffraction measurement. The current(I)-voltage(V) characteristics of the coordination polymer lies in the semiconductor range (∼10−3 S m−1) and non-ohmic in nature; the band gap lies below 3.0 eV. The complexes are emissive in the visible region (509–522 nm) and solid phase emission is more intensive than solution phase. The cyclic voltammetry shows Cu(II)/Cu(I) couple at 0.8–0.9 V and ligand reductions at −0.59 to −0.69 V and −0.92 to −1.38 V. The spectral and conducting properties have been explained by DFT computation of molecular functions using optimised structures.

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