Abstract
Photolysis of the title compound (cisDCBPR) with calf thymus DNA leads to the formation of covalent adducts. The reaction is not dependent on oxygen, proceeds with moderate (ca. 10 -3 ) quantum efficiency, and occurs with modest enantioselectivity which is enhanced in low ionic strength media, where electrostatic and/or intercalatory association is evident. At least two covalent adducts involving deoxyguanosine as a ligand have been isolated from the enzymatic degradation of the metalated DNA, one of which is spectroscopically identical with an adduct prepared from the reaction of cisDCBPR with dG
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