✍ Scribed by Toshihiro Nakayama; Toshihiro Hanada; Kazuyasu Ibuki; Kumao Hamanoue
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Picosecond laser photolysis of 9, IO-dibromoanthracene (DBA) in acetonitrile-triethylamine (TEA) reveals no absorption due to an exciplex (between the lowest excited singlet state of DBA and the ground-state TEA), probably owing to its rapid decomposition into the radical anion (DBA-' ) of DBA and the radical cation (TEA+') of TEA. In cyclohexane-TEA, however, the exciplex is produced, indicating its slow decomposition into DBA-' and TEA+' compared with that in acetonitrile-TEA. This is consistent with the result obtained by steady-state photolysis of DBA in the presence of 0.04 M TEA, i.e. the rate of debromination (yielding 9-bromoanthracene) in cyclohexane is z 1.5x IO-* times slower than that in acetonitrile.
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