Fluorescence photoswitch of stiff-stilbene derivatives for anti-counterfeiting

Dual-Stimulus-Driven Dynamically Controllable [3]Rotaxane with Tunable Organic Room-Temperature Phosphorescence

“…Furthermore, the phototriggered interconversion speeds between E and Z isomers were both accelerated drastically compared to 1F (Figures b and S9). Their reaction kinetic process was similar to that in the reported literature . It was notable that photoisomerization quantum yields (Φ E → Z and Φ Z → E ) were both increased by a factor of approximately 18 relative to 1F and were determined to be 1.23% and 1.04%, respectively.…”

“…The photoisomerization reversibility of 1N was more satisfactory than that of 1F (Figure S4b). In this system, when two DB24C8 rings were located at MTA, the electron cloud density of the SSB-MTA segment was enhanced in comparison to 1F , attributed to electrostatic interaction between electron-rich DB24C8 and MTA, which could be the reason for the above changes between 1F and 1N . Significantly, when 1N was retransformed to 1F with addition of 16 equiv of TFA, the conversion yields, photoisomerization speeds, and photoreaction quantum yields all returned to the original levels (Figures S5b, b, and S10).…”

“…Their reaction kinetic process was similar to that in the reported literature. 25 It was notable that photoisomerization quantum yields (Φ E→Z and Φ Z→E ) were both increased by a factor of approximately 18 relative to 1F and were determined to be 1.23% and 1.04%, respectively. The photoisomerization reversibility of 1N was more satisfactory than that of 1F (Figure S4b).…”

Anaerobic photocyclization of ortho‐dialkylamino substituted stiff‐stilbenes

“…Furthermore, stiff-stilbene has traditionally been considered inactive for photocyclization [27], likely due to the presence of an unstable DHP intermediate. As a result, its derivatives have been widely employed in various applications [28], including photo-switches [29][30][31][32], molecular devices [33][34][35][36][37][38], photoluminescence materials [39,40], switchable catalyst [41], and dynamic supramolecular systems [42][43][44][45][46]. The occurrence of photocyclization reactions for stiff-stilbene derivates could significantly impact their applications as photo-switches.…”