ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
3-Phenylcyclohexa-1,4-diene, which is a reaction product in the benzene radiolysis, is decomposed when its solutions in benzene are irradiated by γ-rays. The main products are biphenyl (20%) and dihydrobenzene (10%). They show that hydrogen from phenylcyclohexadiene is transferred to benzene. The high G-value for the disappearance is explained by energy-transfer from a high-lying state of benzene, formed with g(B*) ≥ 2, to the diene. From the concentration dependence in the range 0.015-0.25 Mol/1 can be concluded that τ · ktA is 21 1/Mole for phenylcyclohexadiene and 4 1/mole for cyclohexene, where τ is the lifetime of the excited state of benzene involved in the reaction and ktA is the rate constant for energy-transfer from this excited state to the acceptor. This rate constant is in the same order of magnitude for biphenyl, naphthalene and cyclohexa-1,4-diene as accepted for phenylcyclohexadiene. The nature of the energy transfer from benzene to phenylcyclohexadiene is discussed. The possibilities of charge transfer or the lowest singlet- or tripletstate as excited states are ruled out.
Additional Material:
3 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19690520619
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