Photoisomerization of Linked Anthracenses. A Demanding Test of Molecular Geometry for Intermediates in Photodimerization.
Technical rept. no. 5, 1 Nov 75-31 Aug 76,
BOSTON UNIV MASS DEPT OF CHEMISTRY
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Valence photoisomerization and photophysical properties of a series of dianthry-lethanes, dianthrylmethanes, and tetrabenzo2.2paracyclophane are reported. Fluorescence lifetimes and quantum yields depend upon the nature of the linkage between anthracene moieties. Quantum efficiency for photoisomerization depends on the substitution pattern at 10,10 prime positions. Sandwich dimers with excimer-like interaction are generated on low temperature photolysis in glasses of dianthrylethane but not dianthrylmethane. It is concluded that geometrical requirements for excimerization and photodimerization are quite different. Author
- Polymer Chemistry