|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ПсковГУ |
||
Generation of O - radical anions on MgO surface: Long-distance charge separation or homolytic dissociation of chemisorbed water?статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Malykhin S.E., Volodin A.M., Bedilo A.F., Zhidomirov G.M.
- Журнал: Journal of Physical Chemistry C
- Том: 113
- Номер: 24
- Год издания: 2009
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 10350
- Последняя страница: 10353
- DOI: 10.1021/jp9042123
- Аннотация: 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 0C, this process is initiated by selective excitation of 3-coordinated complexes [Mg 2+-O 2-] 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 - • •....Mg 2+-O -] 3c. DFT simulation of this structure showed that it reproduces the main characteristics of the radical anions 0 - 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. © 2009 American Chemical Society.
- Добавил в систему: Жидомиров Георгий Михайлович