Reversible mechanochromic studies on AIE-inspired smart materials and their applications in HCHO sensing

Abstract

Smart fluorescent materials that respond to external stimuli have received more and more attention because of their excellent optical properties in the field of anti-counterfeiting information security and fluorescent sensing....

Mechanofluorochromic Properties of 1,4-Diphenylanthracene Derivatives with Hypsochromic Shift

“…Similar crystallization of the ground sample was also observed when fuming with CH 2 Cl 2 vapor for 2 h (Figure 10d). These observations, like those in the previously reported paper, show that this mechanofluorochromism may be operating under a phase transition from the crystalline state to the amorphous state [32][33][34][35][36][37][38][39][40][41][42][43][44][46][47][48][49]52,53,55,[57][58][59]71,72,77,80,83,84,86,87,[89][90][91][92][93][94]. Furthermore, during the vapochromic and thermochromic recovery of the ground sample of 1f, a reversible change in the fluorescence lifetimes (pristine: τ = 32.8 ns, ground: τ = 18.4 ns, ground-fumed with CH 2 Cl 2 vapor: τ = 29.3 ns, ground-heated: τ = 30.6 ns) was observed (Figure 7).…”

“…Mechanofluorochromic materials, which are solid organic light-emitting materials that change their luminous color upon mechanical stimuli by crushing or grinding, have attracted attention for their applications in security inks, memory chips, and pressure sensors [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. Numerous organic mechanofluorochromic materials have been reported, including metal complexes [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ], anthracene derivatives [ 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ], pyrene derivatives [ 66 , 67 , 68 , 69 , 70 ,…”

“…Mechanofluorochromic materials, which are solid organic lightemitting materials that change their luminous color upon mechanical stimuli by crushing or grinding, have attracted attention for their applications in security inks, memory chips, and pressure sensors [20][21][22][23][24][25][26][27][28][29][30]. Numerous organic mechanofluorochromic materials have been reported, including metal complexes [31][32][33][34][35][36][37][38][39][40][41][42][43][44], anthracene derivatives , pyrene derivatives [66][67][68][69][70][71][72][73][74][75][76], tetraphenylethylene derivatives [77][78][79][80][81][82][83], and organoboron compounds [84][85][86][87]…”

Recent advances in aggregation-induced emission (AIE)-based chemosensors for the detection of organic small molecules

“…For instance, Li and co-workers prepared a TPE-based porous framework ( C30 ) from H 4 TCPE and Zn(NO 3 ) 2 ·6H 2 O in DMA solvent, with a BET surface area of 330.0106 m 2 g −1 . 257 The incremental addition of FA into aqueous suspension of C30 caused a fluorescence change from weak blue to bright green, with the red-shifting and increase in intensity attributed to FA molecules entering the pores of C30 and hence limiting the free rotation of phenyl rings. Furthermore, Qu et al covalently modified UiO-66-NH 2 MOF with naphthylamides bearing hydrazine groups ( C31 ) for selective FA recognition.…”