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Three near-infrared ratiometric fluorescent probes ( A-C ) based on TBET and FRET near-infrared rhodamine acceptors with different p K  a values were designed and synthesized to achieve sensitive ratiometric visualization of pH variations in lysosomes in visible and near-infrared channels. Tetraphenylethene (TPE) was bonded to near-infrared rhodamine dyes through short electrical π -conjugation linkers to prevent an aggregation-caused quenching (ACQ) effect and allow highly efficient energy transfer of up to 98.9% from TPE donors to rhodamine acceptors. Probes A-C respond to pH variation from 7.4 to 3.0 in both buffer solutions and live cells with significant decreases of donor fluorescence and concomitant extraordinary increases of rhodamine acceptor fluorescence because of highly efficient energy transfer. In addition, probe C is capable of determining pH fluctuations in live cells treated with chloroquine. The probes show good photostability, excellent cell membrane permeability, high selectivity to pH, and two well-resolved emission peaks to ensure accurately comparative and quantitative analyses of intracellular pH changes.

journal of materials chemistry. b

Near-infrared fluorescent probes based on TBET and FRET rhodamine acceptors with different p<i>K</i><sub>a</sub> values for sensitive ratiometric visualization of pH changes in live cells

Near-infrared fluorescent probes based on TBET and FRET rhodamine acceptors with different pKa values for sensitive ratiometric visualization of pH changes in live cells

Near-infrared fluorescent probes based on TBET and FRET rhodamine acceptors with different pK_a values for sensitive ratiometric visualization of pH changes in live cells