DOI: 10.1063/1.430895. ESR studies of triplet radical pairs of CO2− in irradiated single crystals of CH3COOLi⋅2H2O

ESR studies of triplet radical pairs of CO2− in irradiated single crystals of CH3COOLi⋅2H2O

10.1063/1.430895

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Single crystals of CH3COOLi⋅2H2O irradiated at 77 °K gave ESR signals arising from triplet radical pairs in addition to ĊH3 radicals. Spectral analyses lead to the conclusion that a pair of CO2− ions are formed with the average separation of 5.95 Å. The unpaired electrons extend over the four neighboring Li cations giving 13-line superhyperfine structures. Strong nuclear spin forbidden transitions arising from the anisotropic coupling with 7Li nuclei were observed in one of the fine structure components. From this behavior the sign of the isotropic coupling of 7Li was determined to be positive. The structure and the trapping site of the paired CO2− ions interacting with Li were elucidated from the g and D tensors as well as the 7Li and 13C hyperfine coupling tensors. The isolated CO2− ions in the crystals annealed at room temperature have been found to undergo hindered oscillation around the O⋅⋅⋅O axis at 77 °K. As a very minute component the radical pairs of ĊH2CO2− were also found in the crystal stored at 77 °K after irradiation.

Bibliography

Nunome, K., Toriyama, K., & Iwasaki, M. (1975). ESR studies of triplet radical pairs of CO2â in irradiated single crystals of CH3COOLiâ2H2O. The Journal of Chemical Physics, 62(8), 2927â2933.

Authors 3

Keichi Nunome (first)
Kazumi Toriyama (additional)
Machio Iwasaki (additional)

References 23 Referenced 7

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{'key': '2024020912554582600_r4', 'first-page': '578', 'volume': '67', 'year': '1971', 'journal-title': 'Trans. Faraday Soc.'} / Trans. Faraday Soc. (1971)
10.1063/1.1675050 / J. Chem. Phys. (1971)
{'key': '2024020912554582600_r6'}
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{'key': '2024020912554582600_r14', 'first-page': '417', 'volume': '16', 'year': '1974', 'journal-title': 'J. Magn. Reson.'} / J. Magn. Reson. (1974)
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Dates

Type	When
Created	22 years, 6 months ago (Feb. 27, 2003, 4:56 p.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 8:46 a.m.)
Indexed	1 year, 6 months ago (Feb. 9, 2024, 6 p.m.)
Issued	50 years, 4 months ago (April 15, 1975)
Published	50 years, 4 months ago (April 15, 1975)
Published Print	50 years, 4 months ago (April 15, 1975)

Funders 0

None

BibTeX

@article{Nunome_1975, title={ESR studies of triplet radical pairs of CO2− in irradiated single crystals of CH3COOLi⋅2H2O}, volume={62}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.430895}, DOI={10.1063/1.430895}, number={8}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Nunome, Keichi and Toriyama, Kazumi and Iwasaki, Machio}, year={1975}, month=apr, pages={2927–2933} }

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