mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-194Research ArticleСтатьиElectron-acceptor Centers of Alkali Metal Modified Alumina Studied by the Anthraquinone as a Probe MoleculeBurovaM. V.

Moscow

mvburova@mail.ruFionovA. V.

Moscow

BonoraM.

Linköping University, S-581 83, Linköping

LundA.

Linköping University, S-581 83, Linköping

LuninV. V.

Moscow

Chemical Department, Moscow State UniversityRussian FederationDepartment of Physics and Measurement Technology IFMSweden200720012024911317Copyright © Burova M.V., Fionov A.V., Bonora M., Lund A., Lunin V.V., 20242024Burova M.V., Fionov A.V., Bonora M., Lund A., Lunin V.V.Burova M.V., Fionov A.V., Bonora M., Lund A., Lunin V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/194

Anthraquinone paramagnetic complexes have been used to study electron-acceptor centers on the surface of alumina modified with alkali metal ions (Li+, Na+, K+). Complexes have been characterized by CW EPR, ENDOR and pulse EPR (HYSCORE) techniques. It has been shown that alkali metal ions decreased the strength of electron-acceptor centers due to the inductive effect. As a result the concentration of anthraquinone complex with two Lewis acid sites (LAS) decreased, but the concentration of complex with one LAS increased with the increasing of alkali metal content. At large alkali metal concentration other kinds of anthraquinone paramagnetic complexes are formed, that are anthrasemiquinone weakly bound with LAS as well as anthrasemiquinone ion pair with alkali metal cation (lithium).

EPRENDORHYSCOREelectron-acceptor centersparamagnetic complexes of anthraquinonealuminaaluminatesThis work was supported by the Federal Agency on the Science and Innovations (State Contract 02.451.11.7012 of August 29, 2005), the Concil on Grants of the President Of the Russian Federation (Program of State Support for Leading Scientific Schools of the Russian Federation, Grant RI-112/001/056) and the Russian Foundation for Basic Research (Project No. 06-03-32830a).ReferencesHandbook of Heterogeneous Catalysis, edited by Ertl G., Knözinger H., Weitkamp J. (Catalytic Processes, WILEY-VCH, 1997), Vol. 4, p. 1559..Handbook of Heterogeneous Catalysis, edited by Ertl G., Knözinger H., Weitkamp J. (Catalytic Processes, WILEY-VCH, 1997), Vol. 4, p. 1559..Moreau S., Gervais M., Douy A. Solid State Ionics 101/103, 625 (1997).Moreau S., Gervais M., Douy A. Solid State Ionics 101/103, 625 (1997).Lunina E.V., Zacharova M.N., Markaryan G.L., Fionov A.V. Coll. Surf. A 115, 195 (1996).Lunina E.V., Zacharova M.N., Markaryan G.L., Fionov A.V. Coll. Surf. A 115, 195 (1996).Fionov A.V. Surf. Sci. 507-510, 74 (2002).Fionov A.V. Surf. Sci. 507-510, 74 (2002).Samoilova R.I., Dikanov S.A., Fionov A.V. et al. J. of Phys. Chem. 100, 44, 17621 (1996).Samoilova R.I., Dikanov S.A., Fionov A.V. et al. J. of Phys. Chem. 100, 44, 17621 (1996).Pushkar Y.N., Parenago O.O., Fionov A.V., Lunina E.V. Coll. Surf. A 158, 179 (1999).Pushkar Y.N., Parenago O.O., Fionov A.V., Lunina E.V. Coll. Surf. A 158, 179 (1999).Fionov A.V., Burova M.V., Tveritinova E.A., Krylova I.V. Rus. Chem. Bul., Int. Edit. 55, 4, 639 (2006).Fionov A.V., Burova M.V., Tveritinova E.A., Krylova I.V. Rus. Chem. Bul., Int. Edit. 55, 4, 639 (2006).

The authors declare that there are no conflicts of interest present.