Influence of Pressure on the Intramolecular Spin Exchange in a Short Imidazolium-Nitroxide Biradical

Boryana Mladenova-Kattnig, Günter Grampp, Alexander I. Kokorin*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

A short-chain imidazoline-type nitroxide biradical R5 NO–CH=N–N=C(CH3)–R5 N, B2, with nitroxide rings R5 N and R5 NO as 1-oxyl-2,2,5,5-tetramethyl-3-imidazoline and 1-oxyl-2,2,5,5-tetramethyl-3-N-oxide imidazoline, respectively, has been studied using X-band electron paramagnetic resonance (EPR) spectroscopy in CH3CN solutions at variable temperature T and pressure P. Changes of the solution viscosity on the intramolecular electron spin exchange in B2 is characterized by calculating the value of the exchange integral |J/a|, where a denotes the 14N hyperfine splitting (hfs) constant. It is revealed that the intramolecular dynamics in B2 do not follow the Debye–Stokes–Einstein law, while the Arrhenius dependence is fulfilled. Probable reasons of such behavior are discussed.

Originalspracheenglisch
Seiten (von - bis)327-334
Seitenumfang8
FachzeitschriftApplied Magnetic Resonance
Jahrgang48
Ausgabenummer4
DOIs
PublikationsstatusVeröffentlicht - 1 Apr. 2017

ASJC Scopus subject areas

  • Atom- und Molekularphysik sowie Optik

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