Abstract
The cleavage of four coumarin dimers, the syn-head-to-tail (ht) dimer of parent coumarin ( syn-ht-CC 1), the anti- and syn-hh dimers of 6-methylcoumarin ( anti-hh-CC 2 and syn-hh-CC 2, respectively) and the anti-hh dimer of 6-dodecylcoumarin ( anti-hh-CC 3), was studied by UV–vis and IR spectroscopy and HPLC upon direct 254 nm irradiation as well as sensitized excitation. The quantum yield of dimer splitting is Φ sp = 0.1–0.3 in various solvents and the effects of structure and solvent polarity are small. In certain solvents some of the dimers produced CO 2 along with the monomers in the splitting reaction. Electron transfer from dimers to the triplet state of sensitizers, such as benzophenone or 9,10-anthraquinone, was observed in acetonitrile.
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