Details

Autor(en) / Beteiligte

• Shi, Zheng
• Peng, Ping
• Strohecker, Daniel
• Liao, Yi

Titel

Long-Lived Photoacid Based upon a Photochromic Reaction

Ist Teil von

• Journal of the American Chemical Society, 2011-09, Vol.133 (37), p.14699-14703

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A visible-light activatable photoacid has been studied, which upon irradiation, changes from a weak acid, with a pK a of 7.8, to a strong acid, which achieves nearly complete proton dissociation. This process is reversible and the half-life of the proton-dissociation state is ∼70s. The long lifetime of the proton-dissociation state is due to a sequential intramolecular photochromic reaction. Using this photoacid, a pH change of 2.2 units has been achieved. In addition, we demonstrated that the photoinduced proton concentration can catalyze an esterification reaction, and greatly alter the volume of a pH-sensitive polymer. This work shows that acid-catalyzed and pH-sensitive processes can be photochemically controlled by using this type of photoacid.