Branched triphenylamine-core compounds: aggregation induced two-photon absorption

Abstract

Three branched molecules (T1-T3) were synthesized through simple step to realize or enhance 2PA in aggregates. Spectra data showed that one-and two-branched molecule (T1 and T2) owned the remarkable AIE properties, which came from the formation of J-aggregation because of their partial planarization in aggregation state. SEM and DLS illustrated that the ordered aggregation and the small particle size had important influence on fluorescence emission. The open aperture Zscan experiments showed that T1 and T2 possessed excellent 2PA properties under aggregation state. The largest 2PA cross section was 8314 GM for T2 in aggregates, which was higher about 13-fold than that in pure solution. All the results displayed that the compounds could obtain the outstanding 2PA performance by adjusting their structure rationally or changing state, which could provide reference for preparing the strong 2PA compounds.Three branched dipole molecules (T1-T3) were designed and synthesized. Spectra data showed that one-and two-branched molecule (T1 and T2) owned remarkable AIE properties, which came from the formation of J-aggregation because of their partial planarization in aggregation state. The open aperture Z-scan experiments showed that T1 and T2 possessed excellent 2PA properties under aggregation state and the largest 2PA cross section was 8314 GM for T2 in aggregates, which was higher about 13-fold than that in pure DMF solution.

Long-Wavelength AIE-Based Fluorescent Probes for Mitochondria-Targeted Imaging and Photodynamic Therapy of Hepatoma Cells

“…The particle size of DCMT (Figure S16C, SI) and DCMC (Figure S16F, SI) aggregates further decreased to 62.4 and 51.3 nm when the water fraction was increased to 90% (v/v) and 70% (v/v), respectively. These results suggest that (1) the probes are not orderly self-assembled in a good solvent, thus exhibiting TICT-caused fluorescence quenching, and (2) in a poor solvent, these amphiphiles self-assemble to form nanoparticles with an enhanced fluorescence, which agrees with previous reports on AIE-based nanoparticle systems …”

Retracted Article: Spatially resolved mechanical properties of photo-responsive azobenzene-based supramolecular gels

“…300-350 nm, which might be overlapped with those of the azobenzene. 42,43 Due to symmetry constraints, the n-p* transition of the azobenzene was not allowed in the planar trans conguration, therefore making the visible range absorbance very weak. In contrast, upon UV irradiation, the n-p* transition was allowed, and the absorbance in the visible range increase because the molar extinction coefficient for the cis n-p* transition was larger than that of the trans n-p* transition.…”

Aggregation-Induced Emission in Phenothiazine-Based Fluorophores: An Insight into the Excited State and Aggregate Formation Mechanism

“…32−34 However, only a few recent experimental studies have been devoted to this issue through Z-scan measurements. 35 With the present work, we aim at a detailed investigation of the AIE mechanism in a series of donor−acceptor molecules, both dipolar and quadrupolar (Chart 1), containing phenothiazine/phenothiazine dioxide as electron donors (represented in blue/orange) and naphthalimide units as electron acceptors (in red). The synthesis and the photophysical characterization of these compounds in solution have previously been reported by our group.…”