ESIPT-active multi-color aggregation-induced emission features of triphenylamine–salicylaldehyde-based unsymmetrical azine family

Abstract

A new family of ESIPT and AIE-active triphenylamine-appended unsymmetrical azine derivatives is reported.

Solvent-assisted planar structure of a stilbene-based salicylhydrazone compound: crystal structure, solvent- and aggregation-induced emission, and switchable luminescence colouration

“…1(a), the L molecule adopts C i symmetry, with a trans conformation for the stilbene group. The bond lengths involved in the stilbene group and the salicylhydrazone group are similar to reported values (Mathivanan et al, 2020;Briceno et al, 2013;Kole et al, 2011). There is a pair of strong intramolecular hydrogen bonds (O1-H1AÁ Á ÁN1, Table 2) which make the salicylhydrazone group almost planar (yellow coloured area in Fig.…”

“…Thus, this kind of species has shown promising aggregation-induced emission (AIE) properties (Hong et al, 2011), which indicates that the aggregated state may hinder the rotation of these functional groups and encourage luminescence emission. However, the structure of the AIE-active material remains unclear because a crystalline product suitable for X-ray analysis is not always available (Mathivanan et al, 2020;Tang et al, 2009). Herein, we report the crystal structure of the AIE-active phase for (E)-4,4 0 -(ethene-1,2-diyl)bis[(N 0 E)-N 0 -(2-hydroxybenzylidene)benzohydrazide] dimethyl sulfoxide disolvate, LÁ2DMSO (Scheme 1).…”

“…Hydrazone compounds, which belong to the Schiff base family, are known for their rich optical properties (Mathivanan et al, 2020;Feng et al, 2018;Li et al, 2017;Wang et al, 2017;Fu et al, 2016). However, the isomerization of the trans-cis transformation for the Schiff base group and the keto-enol transformation for the hydrazone group may greatly decrease the degree of conjugation of the molecular structure which is unwelcome with regard to luminescence properties .…”

Tuning the mechanical flexibility of organic molecular crystals by polymorphism for flexible optical waveguides

“…This molecule was selected as salicylaldehyde-derived Schiff bases are well known to be highly photoluminescent and often show polymorphism in solid-state. 52 Moreover, the chlorine and the bromine atom on the backbone of the molecule can be expected to introduce mechanical compliance in crystal forms. This molecule has significant potential for studying simultaneous effect of polymorphism on the optical and mechanical properties.…”

Aggregation‐induced Emission Properties of Triphenylamine Chalcone Compounds

“…Due to the widespread application of molecules based on the ESIPT mechanism of action [9][10][11] , the behavior of AIE based on the ESIPT mechanism has gradually gained attention in the eld of natural sciences. Generally, a molecule with ESIPT characteristics was composed of a proton donor (such as -OH, -NH 2 ) and a proton acceptor (such as -N=C, C=O) [12] .…”