Abstract
New methodology for the measurement of electrogenerated chemiluminescence (ECL) has been developed by using a dual-electrolysis stopped-flow system. Using this method, the ECL from "energy-sufficient" systems composed of different kinds of ion radicals can be easily observed by mixing both the electrolyzed solutions directly. The apparatus and method have been described in detail as well as the ECL observations for various energy-sufficient systems. In particular, in the reaction between the thianthrene (TH) cation radical and the pyrene (PY) anion radical, it was found that the emission spectra changed with the addition of the precursors, reflecting both complex electron- and energy-transfer processes in solution. The present results indicate that the electron- and energy-transfer reactions changed significantly, depending on the type of molecules. The ECL observation with the addition of the third molecule was also informative to compare the ease of the formation of the excited states. It was clarified that the excited states of 9,10-diphenylanthracene and rubrene are easily formed compared with those of TH and PY.
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