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A highly selective OFF-ON red-emitting phosphorescent thiol probe with large stokes shift and long luminescent
Shaomin Ji1, Huimin Guo, Xiaolin Yuan
1State Key Laboratory of Fine Chemicals, School of Chemical Engineering, 158 Zhongshan Road, Dalian University of Technology, Dalian 116012, PR China.
Abstract:
An OFF-ON red-emitting phosphorescent thiol probe is designed by using the (3)MLCT photophysics of Ru(II) complexes, i.e., with Ru(II) as the electron donor. The probe is non-luminescent because the MLCT is corrupted by electron transfer from Ru(II) to an intramolecular electron sink (2,4-dinitrobenzenesulfonyl). Thiols cleave the electron sink, and the MLCT is re-established. Phosphorescence at 598 nm was enhanced by 90-fold, with a 143 nm (5256 cm(-1)) Stokes shift and a 1.1 mus luminescent lifetime.
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