Abstract
Abstract The photosensitized chemiluminescence (CL) of luminol in basic aqueous solution has been investigated by pulsed laser irradiation and by steady state light irradiation in order to clarify the CL in terms of Type-I (electron transfer) and Type-II (singlet oxygen) mechanisms. Short-lived (μs) and long-lived (ms) CL were observed at 420 nm upon pulsed laser irradiation near 530 nm of the luminol/sensitizer reaction mixture. The kinetics of the CL decay is explained by four rate constants, I(t) = Aex{exp(−k2t) − exp(−k1t)} + Bex{exp(−k4t) − exp(−k3t)}. These results, in addition to the results under steady state conditions, suggest that the long-lived CL dominates the photosensitized CL, which is caused by electron transfer to the triplet state of the sensitizers from luminol (Type-I). On the other hand, short-lived CL is due to a reaction between singlet oxygen and luminol (Type-II), the efficiency of which is smaller by two orders of magnitude compared to that of the Type-I mechanism.
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