Search

Herein, a conjugated oligomer is reported possessing a unique U‐shaped molecular geometry, which significantly affects the intramolecular charge transfer and modulates the fluorescence properties. Upon excitation, it displays blue/red dual emission, which is very sensitive to the polarity and viscosity of solvents. After being incorporated into Pluronic F127 micelles, a dramatic fluorescence enhancement is found in its red emission (up to 27‐fold) along with a stable blue emission at elevated temperature. Accordingly, the emissive micelles are successfully explored as a reliable ratiometric nanothermometer both in solution and in cellular environment. Moreover, compared to nanoparticle counterpart prepared by classical nanoprecipitation, the conjugated oligomer/F127 micelles exhibit a remarkable improvement in photo‐triggered reactive oxygen species (ROS) generation efficiency and photodynamic killing behavior on cancer cells. The current study will help researchers to further understand the structure–property relationship of π‐conjugated fluorophores and design various nanomaterials with promising potential for simultaneous diagnostic and treatment on cancers. [ABSTRACT FROM AUTHOR]

The design of efficient catalysts for the selective oxidation of sp3 C–H bond with air at low temperature is of great importance to the scientific and industrial community. In this work, we design a CeO2–δ modified CuFe2O4 catalyst by a post‐modification method for the selective oxidation of fluorene under an air atmosphere and N‐hydroxyphthalimide (NHPI) at 60 °C. HRTEM results indicate that CeO2–δ nanoclusters sized around 5 nm are successfully modified on the surface of CuFe2O4. XPS and H2‐TPR results show that CeO2–δ modification would favor oxygen transfer at lower temperature due to the synergetic effect between CuFe2O4 and CeO2–δ with rich Ce3+/Ce4+ couples. The results demonstrate that CuFe2O4@CeO2–δ‐0.05 with 4.20 wt.‐% Ce present the best catalytic performance with 94 % conversion of fluorene and excellent reusability at least five times. It is anticipated that the modification of CeO2–δ nanoclusters on the surface leads to increased oxygen activation and transfer to CuFe2O4, which favors the activation of NHPI to phthalimide‐N‐oxyl (PINO) radicals and exhibits an improved catalytic performance. Our results provide some guidance on the design of efficient catalysts by the surface modification strategy. CeO2–δ modification with 4.20 wt.‐% Ce on the surface of CuFe2O4 nanoparticles favors oxygen transfer at lower temperature and leads to better catalytic activity than that of pure CuFe2O4 for the aerobic selective oxidation of fluorene due to the synergetic effect between CuFe2O4 and CeO2–δ with Ce3+/Ce4+. [ABSTRACT FROM AUTHOR]

The catalyst can be reused at least five times. [ABSTRACT FROM AUTHOR]

An MCM-41-immobilized bidentate nitrogen platinum complex is shown to be an efficient catalyst for the hydrosilylation of olefins with triethoxysilane. [ABSTRACT FROM AUTHOR]