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Title: Photoacid for Extremely Long-Lived and Reversible pH-Jumps
Authors: Nunes, Rui M. D. 
Pineiro, Marta 
Arnaut, Luís G. 
Issue Date: 8-Jul-2009
Publisher: American Chemical Society
Citation: Journal of the American Chemical Society. 131:26 (2009) 9456-9462
Abstract: The ability to change the acidity of an aqueous solution within the time of a short laser pulse and use the resulting low pH to drive acid-catalyzed reactions in the irradiated volume opens news perspectives for the spatial and temporal control of a variety of processes. Persistent and reversible acidification of an aqueous solution is achieved with a new molecule, 1-(2-nitroethyl)-2-naphthol, that combines the fast photoacid properties of an aromatic alcohol with the slow proton transfer rates of a nitroalkane. The protons released in a few nanoseconds by pulsed laser excitation of the photoacid last for nearly one second in aqueous solutions. We show that acid−base equilibria with other species is established at the lower pHs of the irradiated volume, that the process is reversible and that it can be maintained under continuous irradiation.
ISSN: 0002-7863
DOI: 10.1021/ja901930c
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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