title: Reversible Photoactivated Phosphorescence of Gold(I) Arylethynyl Complexes in Aerated DMSO Solutions and Gels.
abstract: Phosphorescence in fluid solutions at ambient temperature is usually quenched by molecular oxygen via energy transfer, and singlet oxygen is concomitantly sensitized. The long-lived phosphorescence of a series of AuIarylethynyl complexes with tunable emission energies in aerated dimethyl sulfoxide (DMSO) solutions can be completely and repeatedly switched on by controlled photoirradiation. A trace amount of DMSO oxidation by the sensitized singlet oxygen is proposed to lead to a depletion of molecular oxygen in the local microenvironment of the AuIphosphor in the photoactivation processes. Harnessing the photoactivated phosphorescence and using UV light as a non-contact pen, a writing-erasing-rewriting prototype has been demonstrated with a DMSO gel containing AuIarylethynyl complexes.
authors.affiliation: Department of Chemistry, South University of Science and Technology of China, Shenzhen, Guangdong, 518055, China.
authors.forename: Shigang
authors.initials: S
authors.lastname: Wan
authors.affiliation: Department of Chemistry, South University of Science and Technology of China, Shenzhen, Guangdong, 518055, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
keywords: dimethyl sulfoxide; gold; phosphorescence; photoactivation; singlet oxygen