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• W3208446780 endingPage "111392" @default.
• W3208446780 startingPage "111392" @default.
• W3208446780 abstract "Thiazole orange (TO), an asymmetric cyanine dye, has been widely used in biomolecular detection and imaging of DNA/ RNA in gels, due to its unique fluorogenic behavior: fluorescence of free dye in aqueous solution is very weak but emission can be significantly enhanced in nucleic-acid-bound dye. Herein we describe the ultrafast excited-state dynamics of free TO in aqueous solution by exploiting both a femtosecond upconversion spectrophotofluorometer and a picosecond time-correlated single-photon counting (TCSPC) apparatus. For the first time, the fluorescence lifetime of TO monomer in water was found to be ∼1 ps, mixed with concurrent solvent relaxation (which was confirmed by the experimental results of TO in DMSO). Even at moderate concentration, this lifetime has an amplitude (a measure of molecular fraction) that significantly dominates other lifetimes, and this is the origin of weak steady state fluorescence of free TO in water. We also found a novel slower decay component around 34 ps. Interestingly and in addition, the lifetime component on the 30-40 ps timescale was also found in TO-γ-Cyclodextrin (CD) complexes. The fraction of this component increased with the addition of γ-CD. Cyclodextrin has been reported to promote the aggregation of TO. Thus, although a very coincidental match of this time constant by one for a torsional process within the cavity can not be ruled out, we ascribe the shared 30-40 ps component to the lifetime of a highly quenched TO dimer experiencing intra-and inter-molecular rearrangement." @default.
• W3208446780 created "2021-11-08" @default.
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• W3208446780 date "2022-01-01" @default.
• W3208446780 modified "2023-09-23" @default.
• W3208446780 title "Ultrafast excited-state dynamics of thiazole orange" @default.
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• W3208446780 doi "https://doi.org/10.1016/j.chemphys.2021.111392" @default.
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