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.
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+).
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.
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