Remarkable fluorescence change based on the protonation–deprotonation control in organic crystals

Abstract

Insights into the origin of the fluorescence responsive to protonation-deprotonation stimuli were provided through the study on the crystals of a new stimuli-responsive molecule BP3VA. And the transformation between microcrystals demonstrated the varying emissions of the BP3VA powder.

2-(Anthracenyl)-4,5-bis(2,5-dimethyl(3-thienyl))-1H-imidazole: regulatable stacking structures, reversible grinding- and heating-induced emission switching, and solid-state photodimerization behavior

“… 1 Intermolecular hydrogen bonds and π···π stacking are two kinds of main supramolecular interactions, which could regulate the molecular stacking mode, thus leading to different functional properties, such as stimuli-responsive luminescence, 2 and photochemical reactivity. 3 Considerable attention has been focused on anthracene derivatives, mainly because of their intriguing luminescent properties 4 – 8 and interesting [4π + 4π] photodimerization behaviors. 9 Several anthracene derivatives were found to show reversible emission changes induced by grinding and heating.…”

An Organic Luminescent Molecule: What Will Happen When the “Butterflies” Come Together?

“…BDPVA was simply synthesized by the Wittig–Horner reaction according to our previously reported work . The synthesis route and characterized data are summarized in the supporting information.…”

A novel ratiometric fluorescent probe through aggregation-induced emission and analyte-induced excimer dissociation

“…2b). Because water is a poor solvent for 9-anthraldehyde, the fluorophore molecules must have aggregated in the solution with high water contents, and the aggregation leads to the excimer emission [55,56]. The fluorescence responses of the fluorophore solution upon addition of different amounts of water are clearly visible (Fig.…”

“…These fluorophores usually exhibit aggregation-caused quenching (ACQ) in aqueous media or physiological buffers, which is attributed to the non-radiative relaxation of the excited states of aggregates. Hence, these fluorophores are usually used in dilute solutions; however, when the solution is too dilute, some problems arise, such as weak emission signals and the subsequent low detection sensitivity [24][25][26]. Contrary to many conventional fluorophores, some organic molecules are non-luminescent in molecular state but become strongly emissive when aggregated due to the restricted intramolecular rotation.…”