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A spiropyran derivative (1) behaves as a selective and sensitive cyanide anion receptor in aqueous media under UV irradiation. The receptor can be reproduced just by irradiation with visible light.

A simple copolymer, poly(NIPAM-co-SP), consisting of N-isopropylacrylamide and spiropyran units, behaves as a colorimetric thermometer exhibiting temperature-responsive linear and reversible bathochromic/hypsochromic shift of the absorption spectra under UV irradiation.

A simple copolymer, poly(NIPAM-co-RD), consisting of N-isopropylacrylamide (NIPAM) and rhodamine (RD) units, behaves as a fluorescent thermometer exhibiting selective emission enhancement at a specific temperature range in water.

[reaction: see text] A simple-structured molecule (L1) bearing anthracene fragments at both ends of diethylenetriamine chain behaves as a fluorescent molecular switch with pH-controlled absolutely switchable dual-mode fluorescence in water; each mode consists of monomer (pH9) and excimer (pH9) emissions.

Photoirradiation of an acetone/water mixture containing olefins affords the corresponding methyl ketones highly efficiently via a water-assisted C—C coupling between acetonyl radical and olefins.

A new rhodamine derivative (1) containing an ethylenediamine-N,N-diacetic acid moiety exhibits Cu(II)-selective strong green fluorescence, while showing very weak orange fluorescence with other metal cations.

A bisnaphthyl azadiene derivative (L) demonstrates Hg2+-selective intermolecular excimer emission. This emission is responsive to the number of coordinated Hg2+ atoms, where 2:2 and 2:3 L−Hg2+ complexes are the strongly emissive components, whereas the 2:1 complex is nonemissive.

[reaction: see text] A simple-structured molecule L1, a diethylenetriamine bearing two end pyrene fragments, demonstrates triple-mode fluorescence consisting of monomer and short- and long-lived excimer emissions in water, which are precisely controlled by pH and an addition of a less-polar organic solvent.