Exciplex Emissions of Intra- and Intermolecular Benzophenone and N,N-Dimethylaniline Systems

Hiroshi Masuhara*, Yasuhiro Maeda, Hirochika Nakajo, Noboru Malaga, Kyoichi Tomita, Hitoshi Tatemitsu, Yoshiteru Sakata, Soichi Misumi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Emission spectra of intra- and intermolecular exciplex systems of benzophenone and MA-dimethylaniline were studied in detail at low temperature. Two new emissions were observed for the first time in the present work in addition to the well-known phosphorescence of the CT complex formed in the ground state. The first emission has a lifetime of a few tens nanoseconds, which is common to intra- and intermolecular systems. The second emission with a longer lifetime than that of the first one is obtained only in the case of the intramolecular system. A possibility that these emissions are due to fluorescent products was examined. Considering solvent, temperature, and concentration dependences of these emissions, it is proposed that the first and the second emissions are due to the singlet and the triplet exciplexes, respectively. Dynamic behaviors and geometrical structures of these exciplexes are discussed.

Original languageEnglish
Pages (from-to)634-640
Number of pages7
JournalJournal of the American Chemical Society
Issue number3
StatePublished - 1 Jan 1981


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