caa a22 4500 605545693 CHVBK 20210128100937.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00723-014-0636-1 doi (NATIONALLICENCE)springer-10.1007/s00723-014-0636-1 Intramolecular Spin Exchange in Flexible PEG-based Nitroxide Biradicals in Aqueous Solutions [Elektronische Daten] [G. Ionita, G. Vorobieva, V. Chechik, A. Kokorin] 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• fragments in biradicals in frozen solutions were calculated and compared with dynamic properties of the biradicals. Springer-Verlag Wien, 2015 Ionita G. "Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Splaiul Independentei, 060021, Bucharest, Romania aut Vorobieva G. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation aut Chechik V. Department of Chemistry, University of York, Heslington, YO10 5DD, York, UK aut Kokorin A. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation aut Applied Magnetic Resonance Springer Vienna 46/3(2015-03-01), 251-260 0937-9347 46:3<251 2015 46 723 https://doi.org/10.1007/s00723-014-0636-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00723-014-0636-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ionita G. "Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Splaiul Independentei, 060021, Bucharest, Romania aut NATIONALLICENCE 700 1- Vorobieva G. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation aut NATIONALLICENCE 700 1- Chechik V. Department of Chemistry, University of York, Heslington, YO10 5DD, York, UK aut NATIONALLICENCE 700 1- Kokorin A. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation aut NATIONALLICENCE 773 0- Applied Magnetic Resonance Springer Vienna 46/3(2015-03-01), 251-260 0937-9347 46:3<251 2015 46 723