Toward a mechanistic understanding of exciton-mediated hydrosilylation on nanocrystalline silicon

Download
  1. Get@NRC: Toward a mechanistic understanding of exciton-mediated hydrosilylation on nanocrystalline silicon (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1021/ja208604r
AuthorSearch for: ; Search for:
TypeArticle
Journal titleJournal of the American Chemical Society
ISSN0002-7863
1520-5126
Volume134
Issue1
Pages489497; # of pages: 9
AbstractWhite-light initiated hydrosilylation of nanocrystalline porous silicon was found to be far more efficient (in terms of both kinetics and yield) in the presence of electron-accepting molecules with suitably high reduction potentials, particularly halocarbons. It is known that absorption of visible light by nanocrystalline silicon results in the formation of excitons (electron/hole pairs) and that this exciton can be harnessed to drive a hydrosilylation reaction with an alkene; the Si–C bond forms as a result of attack of the π-electrons of the alkene on the positively charged holes. In order to better understand the white-light initiated mechanism through which this reaction takes place, and to compare with UV-mediated photoemission on Si(111)–H, a series of electron acceptors were screened for their effect on surface alkene hydrosilylation. A very strong correlation between reduction potentials (Ered) of the oxidant and reaction efficiency was observed, with a minimum “turn-on” Ered required for an increase to take place. The oxidant appears to accept, or remove, the electron from the nanocrystallite-bound exciton, favoring attack by the alkene on the positively charged Si nanocrystallite, leading to Si–C bond formation. Radical reactions were discounted for a number of reasons, including lack of effect of radical traps, no apparent Si–Cl bond formation, lack of oxidation of the surfaces, and others. Unlike with other oxidants such as nitro-aromatics, halocarbons do not cause additional surface reactions and promote very clean, fast, and selective hydrosilylation chemistry.
Publication date
LanguageEnglish
AffiliationNational Institute for Nanotechnology; National Research Council Canada
Peer reviewedYes
NPARC number21269002
Export citationExport as RIS
Report a correctionReport a correction
Record identifier10aef643-307f-476b-956f-13c63db58aa0
Record created2013-11-29
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)