Dynamics of pH-sensitive nitroxide radicals in water adsorbed in ordered mesoporous molecular sieves by EPR Spectroscopy / Kovaleva E.G., Molochnikov L.S., Golovkina E.L., Hartmann M., A. Kirilyuk I., A. Grigor'Ev I. // Microporous and Mesoporous Materials. - 2013. - V. 179, l. . - P. 258-264.

ISSN:

13871811

Type:

Article

Abstract:

A spin pH probe technique was used to study the influence of the channel diameter on the EPR spectra of pH-sensitive nitroxide radicals (NR) located in the channels of the mesoporous molecular sieves MCM-41 and SBA-15 with diameters ranging from 2.3 to 8.1 nm. From EPR spectra analysis and the results of the NR retention by the mesoporous molecular sieves upon washing with an aqueous KCl solution, the regularities of NR molecular location inside the channels were studied. The obtained dependence of the fraction of the radical molecules in the fast motional regime (with the rotational correlation times, τc = 2 × 10-11 s-9 × 10-11s) in the channels of the mesoporous molecular sieves as a function of pH indicates that both NR in the fast and slow motional regime (with τc = 8 × 10 -9s-7 × 10-10s) may be used for estimation of the solution acidity inside the channels and of the near-surface electrical potential. © 2013 Elsevier Inc. All rights reserved.

Author keywords:

EPR spectroscopy; Fast (slow) radical motion; Ordered mesoporous materials; pH-sensitive nitroxide radicals

Index keywords:

Electrical potential; EPR spectroscopy; Fast (slow) radical motion; Mesoporous molecular sieves; Nitroxide radicals; Ordered mesoporous; Ordered mesoporous materials; Rotational correlation time; Acid

DOI:

10.1016/j.micromeso.2013.05.01

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880517059&doi=10.1016%2fj.micromeso.2013.05.019&partnerID=40&md5=084cb153904b46f9d30619eda0708a71

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880517059&doi=10.1016%2fj.micromeso.2013.05.019&partnerID=40&md5=084cb153904b46f9d30619eda0708a71
Affiliations	Institute of Chemical Engineering, Ural Federal University, Mira St., 19, 620002 Yekaterinburg, Russian Federation; Department of Inorganic and General Chemistry, Ural State Forest Engineering University, Siberian Highway, 37, 620100 Yekaterinburg, Russian Federation; Erlangen Catalysis Resource Center (ECRC), Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany; Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, Akad. Lavrent'ev Av. 9, 630090 Novosibirsk, Russian Federation
Author Keywords	EPR spectroscopy; Fast (slow) radical motion; Ordered mesoporous materials; pH-sensitive nitroxide radicals
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Correspondence Address	Kovaleva, E.G.; Institute of Chemical Engineering, Ural Federal University, Mira St., 19, 620002 Yekaterinburg, Russian Federation; email: gek1969@bk.ru
CODEN	MIMMF
Language of Original Document	English
Abbreviated Source Title	Microporous Mesoporous Mater.
Source	Scopus