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Nanosecond time-resolved TA spectra of 1-6 in acetonitrile solution. λex = 355 nm, A355 = 0.4 in a 1-cm cuvette. The concentration of each sample solution was 7.2×10−5, 1.8×10−5, 1.9×10−5, 2.8×10−5, 3.1×10−5, and 2.0×10−5 mol•L−1 for 1-6, respectively.
