S. Lillicrap, E. Fielden
Dec 1, 1971
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0
Influential Citations
17
Citations
Journal
Radiation research
Abstract
Hydrogen-bonded cocrystal complexes between adenosine and 5-bromouridine and between 9-methyladenine and 1-methylthymine with various amounts of the 1-methylthymine replaced by 1-methyl-5-bromouracil have been studied as models for the behaviour of 5-bromouracil in DNA. The behavior of the excited states formed after ionizing irradiation in these systems has been studied by observing the luminescence parameters over a temperature range from 93°K to 200°K and from 5 μseconds to 1 second after a 1.6 μsecond electron pulse. In the two-component crystal complexes there is very efficient transfer of electronic excitation energy to the components with the lowest triplet state. In all the systems studied the "acceptor" molecule is the brominated pyrimidine. In the crystal complexes containing small amounts of 5-bromouracil there is evidence of long range energy transfer over at least 200 base pairs with emission still occurring from the lowest triplet level of the system. The rate of migration of electronic ener...