Enhanced emission under proton stimuli based on a phenanthroimidazole derivative by switching the excited state type from the CT to the LE state

Abstract

We report herein a vertical D-A structure molecule based on phenanthroimidazole derivative with rare enhanced emission under proton stimuli, which was caused by the excited state type from CT to...

Dark to bright fluorescence state by inter-connecting fluorophores: concentration-dependent blue to NIR emission and live cell imaging applications

“…E-mail: philip@biotech.sastra.edu b Department of Chemistry, Birla Institute of Technology and Science, acid-responsive functionality with a D-A structure produces tunable/switchable fluorescence including white light emission in solution as well as the solid-state by protonation/deprotonation. 7,[29][30][31][32][33][34] The formation of a charge transfer (CT) excited state in D-p-A fluorophores due to conformational twisting between the D-A units leads to solvent polarity-dependent tunable fluorescence. [35][36][37][38][39][40] Wide fluorescence tuning, particularly extending to the deep red/NIR region has received significant attention in recent years owing to its application potential in night vision devices, bioimaging, sensors and lasers.…”

“…23–28 Integrating acid-responsive functionality with a D–A structure produces tunable/switchable fluorescence including white light emission in solution as well as the solid-state by protonation/deprotonation. 7,29–34 The formation of a charge transfer (CT) excited state in D–π–A fluorophores due to conformational twisting between the D–A units leads to solvent polarity-dependent tunable fluorescence. 35–40…”