Fluorescence from the second excited singlet state of [18] annulenes |
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| Authors: | Urs P. Wild Hans J. Griesser Vo Dinh Tuan Jean F.M. Oth |
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| Affiliation: | Physical Chemistry Laboratory, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland;Laboratory for Organic Chemistry, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland |
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| Abstract: | The emission spectra of the second excited singlet state of [18] annulene and of monofluoro [18] annulene (in a 3-methylpentane glass at 4 K) are reported. The large energy gap between the first and second excited singlet states inhibits fast internal conversion and favours the appearance of S2 → S0 emission. In addition, fluorescence from the S1 state can be observed in monofluoro [13] annulene by exciting into the S2 or directly into the S1 absorption. |
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