The data support the idea that the physical transfer of energy from certain sensitizers to piperylene is a reversible process. That similar behavior was observed for 2-acetonaphthone and fluorenone suggests either that in these cases the quenching process is so exothermic that the controlling factor is the decay processes of piperylene triplets; or that as Et of the sensitizer changes from 53 kcal. to 60 kcal. all four excited piperylene configurations are important. The observed behavior for benzil might be attributed to incomplete data, but perhaps the photostationary states of this compound should be studied more closely.
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Ronald Keith Counsell (Thu,) studied this question.
www.synapsesocial.com/papers/6a080acea487c87a6a40cc68 — DOI: https://doi.org/10.7907/2may-d875
Ronald Keith Counsell
California Institute of Technology
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