Structure of Free Radical inγ-Irradiated 21-Hydroxyprogesterone (Deoxycorticosterone) Single Crystals. ESR/ENDOR and DFT Studies

• Authors: A. Szyczewski , J. Pietrzak , K. Möbius
• Languages of publication: EN

Abstracts

EN

Single crystals of 21-hydroxyprogesterone have been γ-irradiated at 295 K and studied using X-band ESR and ENDOR. The structure of the one type radical has been determined on the basis of an analysis of the angular variation of the spectra. This radical is formed by abstraction of the hydrogen atom from the C(6) carbon, while the unpaired electron is delocalised onto the system O(3), C(3), C(4), C(5), C(6). Hyperfine splitting constants and unpaired electron density distribution have been calculated for the proposed radical structure by using the Gaussian98 set of programs. The results are in very good agreement with the experimental data. The effect of the hydrogen bond and biological activity on the anisotropy of α-hyperfine splitting tensor have also been discussed.

Keywords

EN

76.30.-v; 76.70.-r; 78.70.-g; 31.15.Ew

Discipline

• 76.70.-r: Magnetic double resonances and cross effects(see also 33.40.+f Multiple resonances in atomic and molecular physics)
• 78.70.-g: Interactions of particles and radiation with matter
• 76.30.-v: Electron paramagnetic resonance and relaxation(see also 33.35.+r Electron resonance and relaxation in atomic and molecular physics; 87.80.Lg Magnetic and paramagnetic resonance in biological physics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 1
• Pages: 119-126

Dates

published

2005-07

received

2005-04-24

Contributors

author

A. Szyczewski

• Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

J. Pietrzak

• Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

K. Möbius

• Institute of Molecular Physics, Free University of Berlin, Arnimallee 14, 14195 Berlin, Germany

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Identifiers

DOI

10.12693/APhysPolA.108.119