Journal
APPLIED MAGNETIC RESONANCE
Volume 46, Issue 3, Pages 251-260Publisher
SPRINGER WIEN
DOI: 10.1007/s00723-014-0636-1
Keywords
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Funding
- Russian Foundation for Basic Research [12-03-00623-a]
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Intramolecular spin exchange in four flexible PEG-based bis-nitroxides was studied by X-band electron paramagnetic resonance (EPR) spectroscopy as a function of temperature and solvent viscosity. A series of biradicals with different lengths of the ethylene glycol bridge connecting the two nitroxide groups was investigated in aqueous and mixed 1:1 i-propanol:water solutions. Conformational transitions in liquid solutions of the biradicals were analyzed, and thermodynamic parameters of the conformational reorganization were calculated from the EPR spectra. Intramolecular distances r between paramagnetic > N-O-aEuro cent fragments in biradicals in frozen solutions were calculated and compared with dynamic properties of the biradicals.
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