Photophysics and Photostereomutation of Aryl Methyl Sulfoxides<sup>1</sup>
作者:Woojae Lee、William S. Jenks
DOI:10.1021/jo0056141
日期:2001.1.1
The effect of a methanesulfinyl group on the photophysics of several aromatic chromophores is reported. The spectroscopic singlet and triplet energies are affected only modestly, compared to that parent arenes, but the fluorescence yields fall by at least 1 order of magnitude. Fluorescence lifetimes are short. Fluorescence enhancements are observed on cooling the sulfoxides from room temperature to 77 K. High quantum yields of stereomutation are reduced as the temperature drops. There is not a consistent effect on triplet or phosphorescence yields. It is proposed that these results are consistent with a nonradiative pathway for deactivation of the singlet that results in stereomutation. A modest activation energy of a few kcal/mol is estimated for the photochemical racemization of 1-methanesulfinylpyrene
On the Origins of Nonradiative Excited State Relaxation in Aryl Sulfoxides Relevant to Fluorescent Chemosensing
作者:Rahul S. Kathayat、Lijun Yang、Tosaporn Sattasathuchana、Laura Zoppi、Kim K. Baldridge、Anthony Linden、Nathaniel S. Finney
DOI:10.1021/jacs.6b00572
日期:2016.12.14
unrecognized charge transfer excited state, leading to fluorescence enhancement. This charge transfer state derives from the initially formed locally excited state followed by intramolecular charge transfer to form a sulfoxide radical cation/aryl radical anion pair. With the aid of computational studies, we map out ground and excited state potential energy surface details for aryl sulfoxides, and conclude
Sulfoxides as Response Elements for Fluorescent Chemosensors
作者:Rahul S. Kathayat、Nathaniel S. Finney
DOI:10.1021/ja407099a
日期:2013.8.28
Sulfoxides are shown to be viable reporting groups for fluorescent chemosensor development. Metal coordination of sulfoxide-appended fluorophores suppresses excited-state pyramidal inversion of the sulfoxide, leading to enhanced fluorescence emission. This new structural motif allows the construction of fluorescent chemosensors that do not require nitrogen coordination as part of the signaling process