Blue Fluorescent Dinuclear Copper(II) Complex for Light-Emitting Applications

Luminescent copper complexes have attracted recent attention as emerging materials due to their specific light-emitting applications. Due to their cost-effective and luminescent tunable nature, luminescent copper complexes have been studied widely. A blue-emitting copper(II) dinuclear complex, [Cu2(μ2-OOCCH3)4(L)2] (1) has been synthesized from the reaction between copper(II) acetate and 1-(9-methyl anthracene)-2-(2-methylpyridine)-benzimidazol-2-thione (L). The complex is then characterized by FT-IR, SCXRD, PXRD, TGA, EPR, UV–vis, and fluorescence spectroscopy techniques. The solid-state structure of 1 reveals a dinuclear copper(II) core, where four acetate ligands bridge the copper centers. Due to its dynamic behavior, the complex is nonemissive in the solution state, while the complex emits blue light (λem = 455 nm) in the crystalline state. The quantum yield is found to be 13% in the crystalline state, and a nanosecond decay has been observed for the complex due to its fluorescent nature. The LED coating demonstration is performed to showcase the potential application of such luminescent complexes in light-emitting device technologies.