Controlling or switching the optical signal from a large collection of molecules with the minimum of photons represents an extremely attractive concept. Promising fundamental and practical applications may be derived from such a photon-saving principle. With this aim in mind, we have prepared fluorescent photochromic organic nanoparticles (NPs), showing bright red emission, complete ON-OFF contrast with full reversibility, and excellent fatigue resistance. Most interestingly, upon successive UV and visible light irradiation, the NPs exhibit a complete fluorescence quenching and recovery at very low photochromic conversion levels (<5 %), leading to the fluorescence photoswitching of 420±20 molecules for only one converted photochromic molecule. This "giant amplification of fluorescence photoswitching" originates from efficient intermolecular energy-transfer processes within the NPs.
We have successfully fabricated fluorescent [Cu(μ-Br)dppb] 2 nanoparticles by developing the heterogeneous reaction process. The fluorescence peak position of the resulting [Cu(μ-Br)dppb] 2 nanoparticles was redshifted by ca. 20 nm from that of bulk crystal. In addition, the crystallinity and fluorescence quantum yield of [Cu(μ-Br)dppb] 2 nanoparticles were improved by adopting a suitable annealing treatment.
SiNN-pincer iridium complexes were synthesised and demonstrated to catalyse deuteration of trialkylsilanes with benzene-d6 through H/D exchange at room temperature.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.