Intramolecular Spin Exchange in Flexible PEG-based Nitroxide Biradicals in Aqueous Solutions

Verfasser / Beitragende:
[G. Ionita, G. Vorobieva, V. Chechik, A. Kokorin]
Ort, Verlag, Jahr:
2015
Enthalten in:
Applied Magnetic Resonance, 46/3(2015-03-01), 251-260
Format:
Artikel (online)
ID: 605545693
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024 7 0 |a 10.1007/s00723-014-0636-1  |2 doi 
035 |a (NATIONALLICENCE)springer-10.1007/s00723-014-0636-1 
245 0 0 |a Intramolecular Spin Exchange in Flexible PEG-based Nitroxide Biradicals in Aqueous Solutions  |h [Elektronische Daten]  |c [G. Ionita, G. Vorobieva, V. Chechik, A. Kokorin] 
520 3 |a 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. 
540 |a Springer-Verlag Wien, 2015 
700 1 |a Ionita  |D G.  |u "Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Splaiul Independentei, 060021, Bucharest, Romania  |4 aut 
700 1 |a Vorobieva  |D G.  |u N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation  |4 aut 
700 1 |a Chechik  |D V.  |u Department of Chemistry, University of York, Heslington, YO10 5DD, York, UK  |4 aut 
700 1 |a Kokorin  |D A.  |u N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation  |4 aut 
773 0 |t Applied Magnetic Resonance  |d Springer Vienna  |g 46/3(2015-03-01), 251-260  |x 0937-9347  |q 46:3<251  |1 2015  |2 46  |o 723 
856 4 0 |u https://doi.org/10.1007/s00723-014-0636-1  |q text/html  |z Onlinezugriff via DOI 
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900 7 |a Metadata rights reserved  |b Springer special CC-BY-NC licence  |2 nationallicence 
908 |D 1  |a research-article  |2 jats 
949 |B NATIONALLICENCE  |F NATIONALLICENCE  |b NL-springer 
950 |B NATIONALLICENCE  |P 856  |E 40  |u https://doi.org/10.1007/s00723-014-0636-1  |q text/html  |z Onlinezugriff via DOI 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Ionita  |D G.  |u "Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Splaiul Independentei, 060021, Bucharest, Romania  |4 aut 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Vorobieva  |D G.  |u N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation  |4 aut 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Chechik  |D V.  |u Department of Chemistry, University of York, Heslington, YO10 5DD, York, UK  |4 aut 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Kokorin  |D A.  |u N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation  |4 aut 
950 |B NATIONALLICENCE  |P 773  |E 0-  |t Applied Magnetic Resonance  |d Springer Vienna  |g 46/3(2015-03-01), 251-260  |x 0937-9347  |q 46:3<251  |1 2015  |2 46  |o 723