Triplet states nurture the long‐lived emission at room temperature of a chlorine‐containing tetraphenylimidazole derivative when aggregation occurs in water/acetonitrile mixtures

Photochemistry and Photobiology, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Abstract In recent years, there have been numerous reports on the synthesis and applications of 1,2,4,5‐tetraphenylimidazole (TEPI) derivatives, particularly due to photophysical properties such systems. However, long‐lived emission behavior TEPIs has not studied, with research largely limited attempts at 77 K. this study, compound 1‐(4‐chlorophenyl)‐2,4,5‐triphenyl‐1 H ‐imidazole (TEPI‐Cl) was prepared characterized using experimental techniques (i.e., absorption spectra, steady‐state, emission), as well computationally, a combination Extended Tight Binding (xTB), Density Functional Theory (DFT), Time‐Dependent (TD‐DFT) methods. TEPI‐Cl exhibited low solvatochromic effect, both in steady‐state organic solvents, which is typical locally excited transition; confirmed by performed calculations. its aggregated state (observed water/acetonitrile mixtures >80% water, volume), displayed emergence new band spectrum, aggregate‐induced enhanced analysis. The spectrum recorded room temperature shows two signals (at 380 540 nm) presence benzil enables generation triplet states latter, likely through an energy transfer process. sensitivity these oxygen suggested that related are nature; moreover, calculated electronic transitions for optimized structures T 1 2 comparable experimentally observed wavelengths. This newly comes novel property added class molecules, demonstrating significant potential further complex matrices.

Language: Английский

Construction of novel blue-lighting emitters via stepwise locking-ring strategy in multi-aryl modified imidazole-based heterocyclic framework

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 159034 - 159034

Published: Dec. 1, 2024

Language: Английский