Skip to main content
SpringerLink
Log in

Free radicals in malonic acid: A study of radical conformations at 77 K and 295 K by the ESR-technique

  • Published:
Biophysik Aims and scope Submit manuscript

Summary

Single crystals of malonic acid (CH2(COOH)2), have been irradiated with 4.0MeV electrons at liquid nitrogen temperature. The induced radicals have been identified by electron spin resonance technique. ESR lines due to different conformations of the ĊH2(COOH) radical are observed. ESR lines due to the ĊOOH radical are also seen. It is suggested that the fragmentation into these radicals takes place preferentially on one side of the molecule and subsequent to the ionization event. Upon warming of the crystal to room temperature, the ĊOOH radical disappears and the ĊH(COOH)2 radical is formed. The latter radical seems to exist in two slightly different modifications.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Beveridge, D. L., McIver, J. W., Jr.: INDO molecular orbital study of hyperfine tensors: theory, methodology, and applications to CH, CH3, and radicaloid derivatives of malonic acid. J. chem. Phys.54, 4681–4690 (1971).

    Google Scholar 

  2. Ghosh, D. K., Whiffen, D. H.: The electron spin resonance spectrum ofγ-irradiated single crystal of glycine. Molec. Phys.2, 285–300 (1959).

    Google Scholar 

  3. Goedkoop, J. A. and Mac Gillavry, C. H.: The crystal structure of malonic acid. Acta Cryst.10, 125–127 (1957).

    Google Scholar 

  4. Heller, H. C., McConnell, H. M.: Radiation Damage in organic crystals. II: (C02H) CH (CO2H) inβ-succinic acid. J. chem. Phys.32, 1535–1539 (1960).

    Google Scholar 

  5. Holden, A. N., Kettel, C., Merritt, F. R., Yager, W. A.: Determination ofg-values in paramagnetic organic compounds by microwave resonance. Physiol. Rev.77, 147–148 (1950).

    Google Scholar 

  6. Horsfield, A., Morton, J. R., Whiffen, D. H.: Electron spin resonance ofγ-irradiated malonic acid. Molec. Phys.4, 327–332 (1961).

    Google Scholar 

  7. McConnell, H. M., Strathdee, T.: Theory of anisotropic hyperfine interactions inπ-electron radicals. Molec. Phys.2, 129–138 (1959).

    Google Scholar 

  8. McConnell, H. M., Heller, C., Cole, T., Fessenden, R. W.: Radiation damage in organic crystals. I: CH(COOH)2 in malonic acid. J. Amer. chem. Soc.82, 766–775 (1960).

    Google Scholar 

  9. Morton, J. R.: Electron spin resonance spectra of oriented radicals. Chem. Rev.64, 453–471 (1964).

    Google Scholar 

  10. Schonland, D. S.: On the determination of the principalg-values in electron spin resonance. Proc. physiol. Soc.73, 788–792 (1959).

    Google Scholar 

  11. Stone, E. W., Maki, A. H.: Hindered internal rotation and ESR spectroscopy. J. chem. Phys.37, 1326–1333 (1962).

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Biophysics, Institute of Physics, University of Oslo, Blindern, Norway

    Ragnar Bergene & Thor B. Melø

Authors
  1. Ragnar Bergene
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Thor B. Melø
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Bergene, R., Melø, T.B. Free radicals in malonic acid: A study of radical conformations at 77 K and 295 K by the ESR-technique. Biophysik 9, 1–12 (1972). https://doi.org/10.1007/BF01293477

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01293477

Keywords

Search

Navigation