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

doi:10.1016/0009-2614(94)00302-5

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

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English (US)
Pages (from-to)	185-190
Number of pages	6
Journal	Chemical Physics Letters
Volume	222
Issue number	1-2
DOIs	https://doi.org/10.1016/0009-2614(94)00302-5
State	Published - May 6 1994

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1016/0009-2614(94)00302-5

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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. / Shafirovich, Vladimir Ya; Kuzmin, Vladimir A.; Geacintov, Nicholas E.
In: Chemical Physics Letters, Vol. 222, No. 1-2, 06.05.1994, p. 185-190.

Research output: Contribution to journal › Article › peer-review

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title = "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",

abstract = "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.",

author = "Shafirovich, {Vladimir Ya} and Kuzmin, {Vladimir A.} and Geacintov, {Nicholas E.}",

note = "Funding Information: This work was supportedb y Grant DE-FGOZ 86ER06045fr om The Office of Healtha ndE nviron-mentaRl esearchT, he US Departmenot f Energy.",

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doi = "10.1016/0009-2614(94)00302-5",

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AU - Shafirovich, Vladimir Ya

AU - Kuzmin, Vladimir A.

AU - Geacintov, Nicholas E.

N1 - Funding Information: This work was supportedb y Grant DE-FGOZ 86ER06045fr om The Office of Healtha ndE nviron-mentaRl esearchT, he US Departmenot f Energy.

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N2 - 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.

AB - 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.

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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

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