Phenothiazine-based benzoxazole derivates exhibiting mechanochromic luminescence: the effect of a bromine atom

Abstract

The mechanochromism of two phenothiazine-based benzoxazole derivates (PVB and BPVB) was compared. The ground film of PVB without bromine atoms can self-cure within 15 min at room temperature, while the ground film for BPVB showed no changes for at least 2 weeks.

Reversible mechanofluorochromism and acidochromism using a cyanostyrylbenzimidazole derivative with aggregation-induced emission

“…Therefore, the signicant red-shi of the emission band and the large Stokes shis in polar solvents compared with those in nonpolar solvents and solvent polarity demonstrated that an ICT characteristic for the excited state. 19 These results in the absorption and uorescence spectra imply that TBM is a typical D-p-A molecule and the absorption band around 400 nm is originated from ICT transition.…”

Mechanofluorochromic Properties of an AIEE‐Active 2‐Phenylbenzoxazole Derivative: More than Meets the Eye?

“…A prerequisite is therefore a loose molecular stacking in the crystal state, which can be easily destroyed under mechanical stimuli. Among the many MFC molecules reported to date, those containing non‐planar π‐conjugated moieties, or aromatic groups linked by a single bond, are good candidates, especially when appended chemical groups increase the number of possible conformations in the solid state . Such molecules are often derivatives of aggregation‐induced emission (AIE) fluorogens …”

Highly sensitive and reliable SERS probes based on nanogap control of a Au–Ag alloy on silica nanoparticles

“…[20][21][22][23][24][25][26][27][28][29][30] In this strategy, the silica NPs are widely used as a template for metal NPs as they are inert, and their sizes are easily controllable. So far, although the assembly of Au and/or Ag NPs onto silica NPs has been reported by several groups, 4,15,[23][24][25][26][27][31][32][33][34][35][36][37][38][39] the density of the Au and/or Ag NPs and the gaps between two NPs which can provide a stronger LSPR property are not studied well. 40 In this study, we report an easy method to prepare nanogaps containing Au-Ag NPs on silica NPs (SiO 2 @Au@Au NPs) for the sensitive detection of chemicals as strong and reliable SERS probe.…”