A novel
light-emitting material 4-(4-diphenylaminophenyl)-benzo[d,e]benzo[4,5]imidazo[2,1-a]isoquinolin-7-one
(4-TPA-BBI) is synthesized and characterized.
4-TPA-BBI exhibits excellent polymorphism, mechanochromic luminescence
(MCL), and electroluminescence properties. It can form three different
aggregate species: yellow rod-like crystal (Y-crystal), orange needle-like
crystal (O-crystal), and red solid (R-solid). It is observed that
the Y-crystal can be reversibly changed to R-solid upon external stimuli,
while O-crystal can be irreversibly transformed to R-solid via sublimation
under a vacuum. Crystallographic and photophysical studies indicate
that the Y-crystal featuring loose molecular packing demonstrates
a high photoluminescence quantum yield (ΦPL ≈
1) and obvious MCL property, while the compactly packed O-crystal
shows a lower ΦPL of 0.646 with negligible MCL. A
nondoped light-emitting device based on 4-TPA-BBI as an emitter exhibits
bright orange emission with a peak at 588 nm, a high external quantum
efficiency of 4.4%, and a maximum luminance of 22470 cd m–2.
Two glyco-probes, GFP and GFN, which are derived from the condensation of 3-acetyl-5-C-(2,3-dihydroxy-1,4-anhydro-β-D-erythro-tetrofuranosyl)-2-methylfuran with benzaldehyde and 1-naphthaldehyde, respectively, are designed and synthesized. Of these two probes, GFP displays a selective and sensitive switch-on fluorescence response towards bovine serum albumin in phosphate-buffered saline over a wide pH range. Moreover, the fluorescence of this probe displays a good linear relationship with the bovine serum albumin concentration ranging from 0 to 0.8 mg/mL, and has a limit of detection as low as 3.7 nM. The stoichiometric ratio of bovine serum albumin /GFP is 1:1. This research paves the way for the development of glyco-probes for bovine serum albumin sensing.
A new probe based on oxadiazole derivative (OXD) containing Schiff base moiety was synthesised as fluorescence turn-on sensor S1 . Furthermore, its fluorescents spectra (FS) result demonstrate that S1 selectively senses bivalent lead ion (Pb(2+)) in HEPES buffer solution (10 mM, pH = 7.0,DMF-H2O, 9:1, v/v), so S1 was a viable candidate as fluorescent receptor for a new Pb(2+) sensor. And the results of fluorescent spectral titration showed this sensor formed 1:1complex with Pb(2+).
Succinylcholine Chloride (SCC), a short-acting neuromuscular relaxant, is non-fluorescent in aqueous solutions. This property makes it impossible to be determined by direct fluorescent method. Naphthalimide dye (NA) exhibits very strong fluorescence emissions in aqueous solution, after complexing with carboxylatopillar[5]arene (CP5A) in aqueous solutions, the fluorescent quenched intensity of complex was observed. On the contraty, stilbazolium dye (SA) exhibits weak fluorescence emissions in aqueous solution, after being included by CP5A, a fluorescence enhancement was observed. However, adding SCC to the NA⊂ CP5A or SA⊂ CP5A complex solution led to the recovery of the fluorescence intensity, in the meantime, the color of SA⊂ CP5A solution changed from dark yellow to light yellow. The competitive supramolecular interaction between SCC, NA and SA for CP5A was studied by spectrofluorometry, H NMR. Herein, a FID (fluorescence indicator displacement) system to detect SCC based on NA⊂ CP5A and SA⊂ CP5A complex was developed.
A novel fluorescent chemosensor containing a coumarin–thiourea unit and a β- N-glycosyl moiety is designed, synthesized, and characterized by 1H NMR, 13C NMR, and elemental analysis. The chemosensor can selectively and efficiently detect Hg2+ in CH3CN with a detection limit of 2.6 μM.
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