Abstract
The blinking and photobleaching dynamics of alizarin (1,2-dihydroxyanthraquinone) and purpurin (1,2,4-trihydroxyanthraquinone) are investigated using single-molecule spectroscopy. The time-dependent emission of alizarin and purpurin on glass under N2 is analyzed using the change point detection (CPD) method to compile on- and off-event distributions. The number of distinct emissive events per molecule is about four times higher for alizarin relative to purpurin, consistent with an excited-state intramolecular proton transfer (ESIPT) process to populate an emissive tautomer state. To elucidate the mechanism for blinking (i.e., switching between on and off events), maximum likelihood estimation (MLE), goodness-of-fit tests based on the Kolmogorov–Smirnov (KS) statistic, and the log-likelihood ratio (LLR) tests are used to establish the best fits to the on- and off-interval probability distributions. For both alizarin and purpurin the on intervals are log-normally distributed, and off intervals are Weibull d...
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