Magnetic field effect on triplet formation as a probe of intersystem crossing mechanisms in benzo [a] pyrene diol epoxide derivative-guanosine complexes and covalent adducts

Vladimir Ya Shafirovich, Vladimir A. Kuzmin, Nicholas E. Geacintov

Research output: Contribution to journalArticle


The effects of magnetic fields on triplet formation have been examined in covalent benzo[a]pyrene diol epoxide-N2-2′-deoxyguanosine (BPDE-dG) adducts, and noncovalently interacting tetraol (BPT)/dG hydrolysis products in aqueous and N,N′-dimethylformamide (DMF) solutions. A magnetic field effect (≤ 8%) of opposite sign and saturated at 10 mT on the yield of 3BPT triplets and radical anions BPT-{radical dot} is observed in the BPT/dG system in DMF and is attributed to a hyperfine coupling mechanism. Neither formation of BPT-{radical dot} nor magnetic field effects on 3BPT yields are observed in either the covalent or noncovalent interacting systems in water.

Original languageEnglish (US)
Pages (from-to)185-190
Number of pages6
JournalChemical Physics Letters
Issue number1-2
StatePublished - May 6 1994


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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