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Systematic investigations on fused -system compounds of seven benzene rings prepared by photocyclization of diphenanthrylethenes

Abstract

We studied photoproducts of 1-(n-phenanthryl)-2-(m-phenanthryl)ethenes (nEm; n, m = 1, 3 and 9) for understanding the photocyclization patterns based on NMR spectroscopies. The crystal structures of the photoproducts were analyzed by X-ray crystallography, and the photophysical features of the photocyclized molecules were investigated based on emission and transient absorption measurements. Phenanthrene derivatives substituted at the 1- and 3-positions were prepared for synthesizing nEm by photocyclization of stilbene derivatives. We obtained four types of primary photoproducts (n@m) from the corresponding nEm. Two of them were found to have racemic molecular structures in the single crystal determined by X-ray crystallography. Besides the primary photoproducts, two types of secondary photoproducts (n@mPP) were isolated. Fluorescence quantum yields and lifetimes of the obtained photoproducts were determined in solution whereas the definite fluorescence quantum yields were obtained in the powder. Observation of the triplet-triplet absorption spectra in solution by laser photolysis techniques showed that intersystem crossing to the triplet state competes with the fluorescence process.

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Publication details

The article was received on 02 Feb 2017, accepted on 29 Mar 2017 and first published on 30 Mar 2017


Article type: Paper
DOI: 10.1039/C7PP00040E
Citation: Photochem. Photobiol. Sci., 2017, Accepted Manuscript
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    Systematic investigations on fused -system compounds of seven benzene rings prepared by photocyclization of diphenanthrylethenes

    S. Fujino, M. Yamaji, H. Okamoto, T. Mutai, I. Yoshikawa, H. Houjou and F. Tani, Photochem. Photobiol. Sci., 2017, Accepted Manuscript , DOI: 10.1039/C7PP00040E

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