Recent progress in the mechanofluorochromism of cyanoethylene derivatives with aggregation-induced emission

Abstract

This review provides a clear overview of the recent progress in the mechanofluorochromism of cyanoethylene derivatives with aggregation-induced emission.

Efficient solid-state emission and reversible mechanofluorochromism of a tetraphenylethene-pyrene-based β-diketonate boron complex

“…30-8.25 (m, 3H), 8.08-8.01 (m, 2H), 2.96 (s, 3H), 1.61 (s, 18H) ( Fig. S3 †); 13 C NMR (100 MHz, CDCl 3 ) d 201. 93, 149.50, 149.06, 134.73, 132.37, 130.78, 128.89, 128.33, 127.12, 126.69, 124.53, 123.90, 123.66, 123.52, 122.93, 121.88, 35.50, 35.22, 31.94, 31.88, 29.92 (Fig.…”

“…Fig. S6 †); 13 C NMR (100 MHz, CDCl 3 ) d 186. 69, 182.30, 151.96, 149.65, 149.50, 143.91, 142.88, 142.64, 139.50, 133.17, 132.20, 131.33, 131.23, 131.09, 129.65, 128.73, 128.54, 128.27, 128.05, 127.77, 127.33, 127.05, 126.62, 125.45, 124.34, 123.43, 121.09, 98.10, 35.54, 35.27, 31.84 (Fig.…”

“…8a,9 Generally, the dyes possess nonplanar p-conjugated structures and hence afford a looser molecular packing pattern in the crystal states, and can be easily damaged under external stimuli. As is well known, the derivatives of tetraphenylethene, 6a,10 triphenylacrylonitrile, 11 triphenylamine, 12 and cyanoethylene, 13 as well as some boron complexes 14 are preferentially considered to act as MFC materials. Although the mechanisms for mechanochromism are somewhat clear, MFC dyes with extremely large MFC shis (>60 nm) and obvious color contrast under simple mechanical force are still rare.…”

Aggregation‐Induced Emission‐Active 1,4‐Dihydropyridine‐Based Dual‐Phase Fluorescent Sensor with Multiple Functions

“…In recent years, 1,4‐dihydropyridine‐based fluorescent molecules have received increasing attention because of their simple structures, easy syntheses, excellent photophysical properties, and extensive applications in fluorescent sensors . Importantly, some 1,4‐dihydropyridine derivatives reportedly exhibit outstanding AIE properties and emit good solid‐state fluorescence upon a simple structural modification.…”

“…In recent years, 1,4-dihydropyridine-based fluorescent molecules have received increasing attention because of their simple structures, easy syntheses, excellent photophysical properties, and extensive applications in fluorescent sensors. [12][13][14][15][16][17][18] Importantly,s ome1 ,4-dihydropyridined erivatives reportedly exhibit outstanding AIE properties and emit good solid-state fluorescenceu pon as imple structuralm odification. Specifically,anappropriate structuralunit introduced on the nitrogena tom of the 1,4-dihydropyridine ring can lead to twisted molecular conformations.…”