ESR Study of Nanocrystalline Aerogel-Prepared Magnesium Oxide Full article
| Journal |
PCCP: Physical Chemistry Chemical Physics
ISSN: 1463-9076 , E-ISSN: 1463-9084 |
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| Output data | Year: 2003, Volume: 5, Number: 19, Pages: 4299-4305 Pages count : 7 DOI: 10.1039/b309059k | ||||
| Tags | anion; base; crystallin; Lewis acid; magnesium oxide; nitrobenzene; organic compound; oxygen; radical; tempone | ||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Russian Foundation for Basic Research | 03-03-33178 |
| 2 | Civilian Research and Development Foundation | RC1-2340-NO-02 |
Abstract:
Two signals have been observed in the ESR spectra of nanocrystalline MgO synthesized by an aerogel technique. These signals have been assigned to F+ centers in the nanocrystals and –O–˙CH2 radicals formed from residual methoxide groups present at the points of contact between the nanocrystals. The signal of F+ centers was found to be thermally stable up to 500 °C in oxidizing atmosphere. The second signal was somewhat less stable, and could be removed upon heating to 300 °C in the presence of oxygen. Similar organic radicals could be generated by UV irradiation of aerogel prepared (AP) samples, while their concentration appeared to follow the concentration of residual organics in the materials. Irradiation of the samples in the presence of oxygen resulted in the formation of 4-coordinated surface [O−˙O2] radical anions, while no signal typical for 3-coordinated radical anions was observed. Strong Lewis acid and basic sites on the surface of AP-MgO were characterized using the adsorption of 2,2,6,6-tetramethyl-4-oxo-1-oxyl-pyperidine (TEMPONE) and dinitrobenzene, respectively.
Cite:
Richards R.M.
, Volodin A.M.
, Bedilo A.F.
, Klabunde K.J.
ESR Study of Nanocrystalline Aerogel-Prepared Magnesium Oxide
PCCP: Physical Chemistry Chemical Physics. 2003. V.5. N19. P.4299-4305. DOI: 10.1039/b309059k WOS Scopus РИНЦ ANCAN OpenAlex
ESR Study of Nanocrystalline Aerogel-Prepared Magnesium Oxide
PCCP: Physical Chemistry Chemical Physics. 2003. V.5. N19. P.4299-4305. DOI: 10.1039/b309059k WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Jul 30, 2003 |
| Accepted: | Aug 8, 2003 |
| Published online: | Aug 26, 2003 |
Identifiers:
| Web of science: | WOS:000186173300035 |
| Scopus: | 2-s2.0-0142156523 |
| Elibrary: | 13438967 |
| Chemical Abstracts: | 2003:730398 |
| Chemical Abstracts (print): | 140:20177 |
| OpenAlex: | W2087289781 |