A New Water-Soluble Near-Neutral Ratiometric Fluorescent pH Indicator
作者:Sheng Yao、Katherine J. Schafer-Hales、Kevin D. Belfield
DOI:10.1021/ol7026366
日期:2007.12.1
Donor-pi-acceptor fluorene derivative 1c is a near-neutral pHindicator whose pKa of approximately 7.0 was determined by both absorption and fluorescence methods. 1c satisfies important criteria for a sensitive ratiomeric fluorescent pHindicator with a distinctive isoemissive point, good dispersion in cell cytosol, and low cytotoxicity. Furthermore, its 2PA cross section of 100 GM in its neutral form