Synthesis and photophysical properties of Cu(I) complexes with bulky phosphine ligands

Abstract

Luminescent materials are in high demand due to their wide-ranging applications across various fields such as OLEDs, LECs, photosensitizers in dye-sensitized solar cells, memory devices, anti-theft devices, and more. Cu(I) metal complexes offer a promising alternative for luminescent materials due to their high abundance, which impacts material cost, as well as their high luminescence efficiency and comparatively easy synthesis. This work aim is to synthesised cost effective and highly emissive material by using Cu(I) metal and nitrogen and phosphorous donor organic ligands. For that two-nitrogen donor organic ligands 9-(pyrimidin-5-yl)-9H-carbazole (L1) and 2-(pyridin-4-yl) isoindoline-1,3-dione (L2) were synthesised. Then By the reaction between CuI metal and ligand (L1, L2) by varying metal ligand ration and different solvent condition we got four new 1D and 2D coordination polymers [Cu4I4(5-CzPm)(CH3CN)2] (CP1), [Cu2I2(5-CzPm)] (CP2), [Cu4I4(5-CzPm)] (CP3), and (Cu2I2(2-Py.isoindoline)] (CP4) furthermore, bulky phosphine ligands (PPh3, POP) were incorporated and explore the photophysical properties of the resulting coordination polymers/complexes. It is postulated that the incorporation of bulky phosphines will reduce distortions in the excited state and reduce non-radiative transitions, thereby yielding materials with enhanced quantum efficiency. Additionally, this work delved into the mechanochromism and thermochromism luminescent properties of these coordination polymers.