Multiple-color aggregation-induced emission (AIE) molecules as chemodosimeters for pH sensing

Abstract

A series of 4-N,N-dimethylaminoaniline salicylaldehyde Schiff-base derivatives (DAS) were facilely prepared. They exhibit typical AIE properties with various fluorescence emissions and high fluorescence quantum yields in an aggregated state. DAS exhibit unique pH-dependent optical properties, which indicated their potential applications in pH sensing.

2,5-bis(4-alkoxycarbonylphenyl)-1,4-diaryl-1,4-dihydropyrrolo[3,2-b]pyrrole (AAPP) AIEgens: tunable RIR and TICT characteristics and their multifunctional applications

“…Using the equations k r = φ / τ and k nr = (1 – φ )/ τ (where k r and k nr are the radiative decay rate constant and the non-radiative decay rate constant, respectively), the excited-state decay rate constants of AAPP could be estimated. 36 As can be seen in Table S1,† k nr was about 3 × 10 8 s –1 in all of the mixtures of THF/ n -hexane without apparent change. These results suggested that similar forms (the dispersed state) may be contained in all of the mixtures.…”

Aggregation‐Induced Emission Properties of Copper Iodide Clusters

“…[6,[20][21][22] The term piezofluorochromica ggregation-induced emission (PAIE) was even introduced. [23] Many pure organic mechanochromic materials with AIE-activem olecules were thus reported, [24][25][26][27][28][29][30][31] along with organoboron complexes. [32,33] Regarding metal-based compounds that combine AIE and mechanochromic properties, few studies have been reported, with examplesb ased on iridium(III), [34][35][36][37][38][39] cadmium(II), [40] zinc(II), [41,42] and gold(I) [43] complexes.…”

Hydrazide–Hydrazone Small Molecules as AIEgens: Illuminating Mitochondria in Cancer Cells

“…The field-emission scanninge lectron microscopy (FESEM) images evidently showed that compound 4a aggregated into 2D sheet-like structuresi nw ater,w hereas no significant aggregation was found in methanol ( Figure 2c). [32,33] Subsequently the frontier molecular orbitals and the energy gap between HOMOsa nd LUMOs of compound 4a was calculated by density functional theory (DFT), which revealed the energy gap was approximately 4.18 eV (about3 00 nm) correlating with the wavelength of UV/Vis absorbance (Figure 2d). We also performed fluorescence lifetime experiments, which revealed that the fluorescencel ifetime for compounds 4a and 4b was 1.97 and 1.50 ns, respectively,w hich are little less compared to rhodamine 123,atraditionally used commercialm itochondriai maging agent ( Figure S14, Supporting Information).…”

“…[32] The fluorescence quantum yield of compound 4a and 4b weref ound to be 12.2 and 5.4 %, respectively,w hich are comparable with the structurally similari mine compounds as well as much higher to rhodamine123 ( % 0.9 %). [32,33] Subsequently the frontier molecular orbitals and the energy gap between HOMOsa nd LUMOs of compound 4a was calculated by density functional theory (DFT), which revealed the energy gap was approximately 4.18 eV (about3 00 nm) correlating with the wavelength of UV/Vis absorbance (Figure 2d). We hypothesize dual intramolecular H-bonding as the guiding factor for this hitherto unobserved AIE property for these novel hydrazide-hydrazone small molecules leadingt or estriction in intramolecular motion (RIM;F igure 3a).…”