Intramolecular Mobility in Nitroxide Biradicals with Flexible Linkers

Günter Grampp*, Van Anh Tran, Petr V. Pantyukhov, Alexander I. Kokorin

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung


Intramolecular electron spin exchange has been studied by X-band electron paramagnetic resonance (EPR) spectroscopy in two long-chain flexible nitroxide biradicals existing in fluid solutions in three spectroscopy-different spatial conformations as a function of temperature, solvent viscosity and polarity. Certain thermodynamic parameters of the conformational transitions were calculated from the EPR spectra. The process of spin-exchange in these biradicals dissolved in five different alcohols was compared with that in the non-polar solvents (toluene) and aprotic (acetonitrile), as well as with two other biradicals studied earlier, and with thermodynamic characteristics of the solvents. A distinct correlation was found between macroscopic (solvent viscosity) characteristics of solvents and thermodynamic parameters of the intramolecular conformational transitions.

Seiten (von - bis)1031-1040
FachzeitschriftApplied Magnetic Resonance
PublikationsstatusVeröffentlicht - 1 Okt. 2020

ASJC Scopus subject areas

  • Atom- und Molekularphysik sowie Optik


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