Functionalization of porous silicon with alkenes and alkynes via carbocation-mediated hydrosilylation

J. M. Schmeltzer, Lon A. Porter, Michael P. Stewart, Carmen M. López, Jillian M. Buriak

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Efforts to produce stable, derivatized porous silicon have yielded a number of chemical methods capable of functionalizing this interesting material with organic monolayers. Hydride-terminated porous silicon substrates react with alkenes and alkynes in the presence of dilute triphenylcarbenium salt solutions to respectively produce alkyl- and alkenyl-functionalized materials. Characterization by transmission FTIR and solid-state NMR suggests the formation of highly stable silicon-carbon bonds to yield covalently bound organic moieties. Porous silicon passivated in this fashion exhibits a greater resistance than that of the native material to chemical degradation, indicating that the organic functionalities may serve to sterically shield the nanocrystallites from nucleophiles. Hydrosilylation is proposed to proceed via hydride abstraction from the substrate followed by electrophilic attack by the subsequent species upon the alkene/alkyne, a mechanism previously hypothesized for the formation of stabilized β-silyl carbocations. The reaction is tolerant of a variety of substrate functional groups and native porous silicon surfaces but depends markedly upon the identity of the salt counteranion, among other solution parameters.

Original languageEnglish
Pages (from-to)561-566
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume737
Publication statusPublished - 2003
Externally publishedYes

Fingerprint

Hydrosilylation
Alkynes
Porous silicon
Alkenes
alkynes
porous silicon
alkenes
Olefins
Hydrides
hydrides
Substrates
Salts
salts
Nanocrystallites
Nucleophiles
nucleophiles
bedrock
Silicon
Functional groups
attack

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Functionalization of porous silicon with alkenes and alkynes via carbocation-mediated hydrosilylation. / Schmeltzer, J. M.; Porter, Lon A.; Stewart, Michael P.; López, Carmen M.; Buriak, Jillian M.

In: Materials Research Society Symposium - Proceedings, Vol. 737, 2003, p. 561-566.

Research output: Contribution to journalArticle

Schmeltzer, J. M. ; Porter, Lon A. ; Stewart, Michael P. ; López, Carmen M. ; Buriak, Jillian M. / Functionalization of porous silicon with alkenes and alkynes via carbocation-mediated hydrosilylation. In: Materials Research Society Symposium - Proceedings. 2003 ; Vol. 737. pp. 561-566.
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