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A boradiazaindacene (BODIPY) derivative containing a simple NO bidentate ligand shows a Cu2+-selective fluorescence in aqueous media. This is promoted viaa coordination of Cu2+followed by oxidative dehydrogenation of an amine moiety, leading to a formation of a fluorescent Cu+–Schiff base complex. [ABSTRACT FROM AUTHOR]

We synthesized a pyrylium–coumarin dyad (1) and used it for colorimetric detection of cyanide anions (CN−) in aqueous media. The receptor itself exhibits a long-wavelength absorption band at 643 nm due to the strong intramolecular charge transfer (ICT) from the diethylaminocoumarin to the pyrylium moiety. Selective nucleophilic addition of CN−to the pyrylium ring triggers the ring cleavage rapidly (within 8 min). This suppresses the ICT and decreases the intensity of the 643 nm band, along with an appearance of a new shorter-wavelength band at 472 nm assigned to the π,π* transition of the diethylaminocoumarin moiety. This drastic absorption change (643 nm → 472 nm) facilitates ratiometric detection of CN−based on the intensities of these two absorption bands in the visible region and successfully detects CN−as low as 8 μM. [ABSTRACT FROM AUTHOR]

Platinum (Pt) nanoparticles with o4 nm diameter loaded on graphitic carbon nitride (g-C3N4) by reduction at 673 K behave as efficient co-catalysts for photocatalytic hydrogen evolution under visible light (λ>420 nm). This is achieved by strong Pt-support interaction due to the high temperature treatment, which facilitates efficient transfer of photoformed conduction band electrons on g-C3N4 to Pt particles. [ABSTRACT FROM AUTHOR]

Cyanine dyes with indolium-coumarin linkages exhibit selective fluorescence enhancement for cyanide anions (CN-) via the nucleophilic interaction of CN- with their indolium carbon atoms. This facilitates rapid (detection time: 1 min) and sensitive (detection limit: 0.4 µM) sensing of CN- in aqueous media. [ABSTRACT FROM AUTHOR]

TiO2loading Pt nanoparticles (Pt@TiO2) promote one-pot synthesis of imines from alcohols and amines under UV irradiation at room temperature. This is achieved viaa Pt-assisted photocatalytic oxidation of alcohols and a catalytic condensation of the formed aldehydes with amines on the TiO2surface. [ABSTRACT FROM AUTHOR]

A polymeric photosensitizer, poly(NIPAM-co-RB), consisting of N-isopropylacrylamide and rose bengal units, demonstrates a temperature-controlled changeable oxygenation selectivity by singlet oxygen in water. [ABSTRACT FROM AUTHOR]