Triarylmethyl Radicals: EPR Study of C Hyperfine Coupling Constants

Overview

Journal Z Phys Chem (N F)

Specialty Chemistry

Date 2017 May 26

PMID 28539703

Citations 5

Authors

Andrey A Kuzhelev

Victor M Tormyshev

Olga Yu Rogozhnikova

Dmitry V Trukhin

Tatiana I Troitskaya

Rodion K Strizhakov

Olesya A Krumkacheva

Matvey V Fedin

Elena G Bagryanskaya

Affiliations

Soon will be listed here.

Abstract

Triarylmethyl (TAM) radicals are widely used in Electron Paramagnetic Resonance (EPR) spectroscopy as spin labels and in EPR imaging as spin probes for oxymetry. One of the key advantages of TAMs is extremely narrow EPR line, especially in case of deuterated analogues (~5 μT). Another advantage is their slow spin relaxation even at physiological temperatures allowing, in particular, application of pulsed dipolar EPR methods for distance measurements in biomolecules. In this paper a large series of TAM radicals and their deuterated analogues is synthesized, and corresponding spectroscopic parameters including C hyperfine constants are obtained for the first time. The negligible dependence of C hyperfine constants on solvent, as well as on structure and number of substituents at para-C atoms of aromatic rings, has been found. In addition, we have demonstrated that C signals at natural abundance can be employed for successful room-temperature distance measurements using Pulsed Electron Double Resonance (PELDOR or DEER).

Citing Articles

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