Large Stokes Shift Induced by Intramolcular Charge Transfer in N,O-Chelated Naphthyridine–BF₂ Complexes

Abstract

Novel N,O-chelated naphthyridine-BF(2) complexes with push-pull structures have been synthesized and characterized. Spectral investigations on these complexes reveal that photoinduced intramolecular charge transfer occurs and results in a large Stokes shift, which is further supported by density functional theory based theoretical calculations.

Light Harvesting and Optical-Electronic Properties of Two Quercitin and Rutin Natural Dyes

“…The theoretical simulated trend of S-Q and S-R is in accordance with the experiment. A large stokes shift can be induced by an excellent ICT property [60,61]. Accordingly, the shorter stokes shift of S-Q demonstrates that S-Q has a low ICT performance.…”

Fluorescent difluoroboron-curcumin analogs: An investigation of the electronic structures and photophysical properties

“…However most of the reported difluoroboron complexes show very small stokes shifts and hardly show any solid state fluorescence. In recent years new class difluoroboron complexes such as boron-diketonates [15][16][17], anilin imines (anils) and/or moieties containing b-iminoenolate ligands with improved properties as solid state fluorescence, sensitivity upon changes in polarity of the microenvironment and aggregation induced http fluorescence [4,15,[18][19][20][21][22] have been developed. The difluoroboron complex of curcumin was initially developed with increased stability and inhibitory potency against HIV protease [23].…”

A Membrane‐Intercalating Conjugated Oligoelectrolyte with High‐Efficiency Photodynamic Antimicrobial Activity

“…Absorption maxima ( λ abs ) are in the range of 505–535 nm, with a progressive blue shift as the polarity of the medium increases. Fluorescence maxima ( λ em ) are in the 660–725 nm range; more polar media lead to a red shift, consistent with an excited state with intramolecular charge transfer characteristics . Fluorescence quantum efficiencies ( Φ F ) were also measured in different solvents.…”