Pulse EPR of Triarylmethyl Probes: A New Approach for the Investigation of Molecular Motions in Soft Matter | Sciact - CRIS-система Института катализа

Pulse EPR of Triarylmethyl Probes: A New Approach for the Investigation of Molecular Motions in Soft Matter Научная публикация

Журнал

The Journal of Physical Chemistry B
ISSN: 1520-6106 , E-ISSN: 1520-5207

Вых. Данные

Год: 2018, Том: 122, Номер: 36, Страницы: 8624-8630 Страниц : 7 DOI: 10.1021/acs.jpcb.8b07714

Ключевые слова

ELECTRON-SPIN RELAXATION; DISTANCE MEASUREMENTS; TRITYL RADICALS; DIPOLAR SPECTROSCOPY; LIPID-BILAYERS; IONIC LIQUIDS; CW EPR; LABELS; RESONANCE; DYNAMICS

Авторы

Kuzhelev Andrey A. ^1,2,3 , Krumkacheva Olesya A. ^2,3 , Ivanov Mikhail Yu. ^2,3 , Prikhod’ko Sergey A. ⁴ , Adonin Nicolay Yu. ⁴ , Tormyshev Victor M. ^1,3 , Bowman Michael K. ^1,5 , Fedin Matvey V. ^2,3 , Bagryanskaya Elena G. ^1,3

Организации

1	N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Novosibirsk 630090, Russia
2	International Tomography Center SB RAS, Novosibirsk 630090, Russia
3	Novosibirsk State University, Novosibirsk 630090, Russia
4	Boreskov Institute of Catalysis SB RAS, Novosibirsk, 630090, Russia
5	University of Alabama, Tuscaloosa, Alabama 35487-0336, USA

Информация о финансировании (4)

1	Министерство образования и науки Российской Федерации	2017-220-06-7355
2	Совет по грантам Президента Российской Федерации	МК-3214.2017.3
3	Российский научный фонд	14-14-00922
4	Сибирское отделение Российской академии наук

Triarylmethyl (TAM) radicals have become widely-used free radicals in the past few years. Their electron spins have long relaxation times and narrow electron paramagnetic resonance (EPR) lines, which make them an important class of probes and tags in biological applications and materials science. In this work we propose a new approach to characterize librations by means of TAM radicals. The temperature dependence of motional parameter <α2 >τc, where <α2> is the mean-squared amplitude of librations and τc is their characteristic time, is obtained by comparison of the 1/Tm phase-relaxation rates at X- and Q-band EPR frequencies. We study three soft matrices, viz. glassy trehalose and two ionic liquids, using TAMs with optimized relaxation properties OX063D and a dodeca-n-butyl homologue of Finland trityl (DBT). The motional parameters <α2>τc obtained using TAMs are in excellent agreement with those obtained by means of nitroxide radicals. At the same time, the new TAM-based approach has: (1) greater sensitivity due to the narrower EPR spectrum; (2) greater measuring accuracy and broader temperature range due to longer relaxation times. The developed approach may be fruitfully implemented to probe low-temperature molecular motions of TAM-labeled biopolymers, membrane systems, polymers, molecules in glassy media and ionic liquids.

Kuzhelev A.A. , Krumkacheva O.A. , Ivanov M.Y. , Prikhod’ko S.A. , Adonin N.Y. , Tormyshev V.M. , Bowman M.K. , Fedin M.V. , Bagryanskaya E.G.
Pulse EPR of Triarylmethyl Probes: A New Approach for the Investigation of Molecular Motions in Soft Matter
The Journal of Physical Chemistry B. 2018. V.122. N36. P.8624-8630. DOI: 10.1021/acs.jpcb.8b07714 WOS Scopus Scopus РИНЦ РИНЦ CAPlus PMID OpenAlex

Поступила в редакцию:	8 авг. 2018 г.
Опубликована online:	23 авг. 2018 г.
Опубликована в печати:	13 сент. 2018 г.

Web of science:	WOS:000444922800013
Scopus:	2-s2.0-85053161805 \| 2-s2.0-85053205753
РИНЦ:	41777770 \| 41777588
Chemical Abstracts:	2018:1576514
PMID (PubMed):	30137993
OpenAlex:	W2888198194

БД	Цитирований
Web of science	15
РИНЦ	15 1
Scopus	16
OpenAlex	16