The electronic spectra of some toxicological phenothiazine drugs have been studied. The primary experimental results show that the <sup>1</sup><i>L</i><sub>a</sub> and <sup>1</sup><i>L</i><sub>b</sub> states overlap in phenergan as they do in 9-methyl anthracene. Substituent effect removes the overlap as shown by the spectra of some Phenergan derivatives. All the transitions which were clearly identified were the π → π* transitions. No separate <i>n</i> → π* transition was identified.
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