Generation of O- Radical Anions on MgO Surface: Long-Distance Charge Separation or Homolytic Dissociation of Chemisorbed Water? Full article
| Journal |
The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455 |
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| Output data | Year: 2009, Volume: 113, Number: 24, Pages: 10350-10353 Pages count : 4 DOI: 10.1021/jp9042123 | ||
| Tags | OXIDE CATALYSTS; CALCIUM OXIDES; NANOCRYSTALS; MAGNESIUM; MOLECULES; ZEOLITES; DEFECTS; CATIONS; SITES; IONS | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Foundation for Basic Research | 06-03-72551 |
Abstract:
O− radical anions were observed over a partially hydroxylated MgO surface after illumination by monochromatic light with λ = 280 and 303 nm. As all corner oxygen atoms are covered with adsorbed hydroxyl groups after activation at 450 °C, this process is initiated by selective excitation of 3-coordinated complexes [Mg2+−O2−]3C containing chemisorbed water. A new mechanism for generation of the O− radical anions is suggested. It is based on homolytic dissociation of chemisorbed water followed by migration of a hydrogen atom, probably, to a different nanoparticle rather than on long-distance separation of charges. The surface structure remaining after its detachment consists of an •OH radical stabilized near the corner oxygen atom. The imminent charge transfer generates a hole at the corner oxygen atom stabilized by a hydroxyl group [OH−···Mg2+−O−]3C. DFT simulation of this structure showed that it reproduces the main characteristics of the radical anions O−3C. The overall structure is electrically neutral. The charge of the hole is compensated by the nearby hydroxyl group. So, no long-distance charge separation is required.
Cite:
Malykhin S.E.
, Volodin A.M.
, Bedilo A.F.
, Zhidomirov G.M.
Generation of O- Radical Anions on MgO Surface: Long-Distance Charge Separation or Homolytic Dissociation of Chemisorbed Water?
The Journal of Physical Chemistry C. 2009. V.113. N24. P.10350-10353. DOI: 10.1021/jp9042123 WOS Scopus РИНЦ ANCAN OpenAlex
Generation of O- Radical Anions on MgO Surface: Long-Distance Charge Separation or Homolytic Dissociation of Chemisorbed Water?
The Journal of Physical Chemistry C. 2009. V.113. N24. P.10350-10353. DOI: 10.1021/jp9042123 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | May 6, 2009 |
| Published online: | May 21, 2009 |
| Published print: | Jun 18, 2009 |
Identifiers:
| Web of science: | WOS:000266930400010 |
| Scopus: | 2-s2.0-67650708375 |
| Elibrary: | 13616115 |
| Chemical Abstracts: | 2009:619937 |
| Chemical Abstracts (print): | 151:87333 |
| OpenAlex: | W1980260185 |