Structure controlled solvatochromism and halochromic fluorescence switching of 2,2′-bipyridine based donor–acceptor derivatives

Abstract

Simple donor-acceptor derivatives have been prepared by substituting alicylic amines into 2,2'-bipyridine (Bpy) core unit that exhibited substituents structure dependent solution and solid state fluorescence, solvatochromism, halochromic fluorescence switching in...

Fluorometric Detection of Methanol by Using Triphenylamine Fluorophore Tethered Terpyridine Probe

“…According to the previous report, the pH of the solution and solvent interactions significantly influences in the inter‐conversion of terpyridine/2,2′‐bipyridine conformation from s‐trans to s‐cis and tune their optical properties [24] …”

“…According to the previous report, the pH of the solution and solvent interactions significantly influences in the interconversion of terpyridine/2,2'-bipyridine conformation from strans to s-cis and tune their optical properties. [24] Similarly, À OH group of solvent can also influences on the absorption and emission properties of terpyridine/2,2'-bipyridine derivatives owing to the hydrogen bonding interactions. [25] The solvent polarity strongly alter the excited state energy of donor-π-acceptor molecules by stabilizing excited state and tune the optical properties.…”

Distinct fluorescence state, mechanofluorochromism of terpyridine conjugated fluorophores and the reusable sensing of nitroaromatics in aqueous medium

“…[46][47][48] In addition, the nitrogen heteroatom in fluorophores can be employed to demonstrate pH dependent fluorescence switching. [49][50][51][52][53][54] Herein, we intended to study the impact of structural assembly by integrating TPA (propellor), TPE (twisted) and Py (planar) aromatic donor units with a planar terpyridine acceptor (Scheme 1) on the structural assembly in the solid state and fluorescence properties. The structural analysis revealed helical, isolated dimer and continuous aromatic stacking formation in the crystal lattice which resulted in LE, CT state and excimeric tunable solid-state fluorescence as well as distinct mechanical pressure induced fluorescence switching.…”

CF3 H-bonding locked aromatic stacking of picric acid with mechanofluorochromic fluorophores: highly selective reusable sensor and rewritable fluorescence platform

“…[24][25][26][27][28] Acid-responsive functionality has led to halochromism and developing rewritable/self-erasable fluorescent platforms. [29][30][31][32][33][34][35] Biological and environmental fluorescent sensors were fabricated by incorporating guest interacting functional groups. [36][37][38][39][40][41][42] The possibility of developing solid-state sensor devices is one of the major advantages of using AIE/AIEE molecules as fluorescent sensors.…”