The fluorescent state of cyano-substituted layered cyclophanes

Hiroshi Masuhara, N. Mataga*, M. Yoshida, H. Tatemitsu, Y. Sakata, S. Misumi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Some cyano-substituted layered cyclophanes were studied by fluorescence and nanosecond laser photolysis in various solvents. Although almost no characteristic solvent effect was observed in the case of IIIc, the results on II, IIIs, and IIIe are summarized as follows, (i) The fluorescent maxima shows a considerable red shift with increasing solvent polarity. A deviation from the modified Lippert-Mataga equation is observed, (ii) The fluorescence quantum yield decreases as the solvent polarity is increased. On the other hand, the solvent dependence of the fluorescence lifetime is diverse. (iii) In the case of some cyclophanes the Sn ← S1 absorption spectra in toluene are different from those in acetonitrile. On the basis of these results it is concluded that the electronic structures of the excited cyclophanes are changed depending on the solvent polarity. The results were compared with those on other excited CT systems and are discussed in general.

Original languageEnglish
Pages (from-to)879-883
Number of pages5
JournalJournal of Physical Chemistry
Volume81
Issue number9
DOIs
StatePublished - 1 Jan 1977

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