Surface organometallic chemistry of main group elements: Selective synthesis of silica supported [Si-OB(C6F5)3] [HNEt2Ph]+

Nicolas Millot, Andrew Cox, Catherine C. Santini*, Yann Molard, Jean-Marie Maurice Basset

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

The reaction of the Lewis acid B(C6F5)3 with silanol groups of silica surfaces, dehydroxylated at different temperatures (300, 500, 700, and 800°C), has been investigated in presence of the Brønsted base NEt2Ph. The structure of the resulting modified silica supports [Si-OB(C6F5)3]- [HNEt2Ph]+ (1) has been carefully identified by IR and multinuclear solid-state NMR spectroscopies, isotopic 2H and 18O labeling, elemental analysis, molecular modeling, and comparison with synthesized molecular models. Highly dehydroxylated silica surfaces were required to transform selectively each silanol group into unique [Si-OB(C6F5)3]- [HNEt2Ph]+ fragments. For lower dehydroxylation temperatures, two sorts of surface sites were coexisting on silica: the free silanol groups [SiOH] and the ionic species 1.

Original languageEnglish (US)
Pages (from-to)1438-1442
Number of pages5
JournalChemistry - A European Journal
Volume8
Issue number6
DOIs
StatePublished - Mar 15 2002

Keywords

  • Ion pairs
  • Silica
  • Supported ammonium
  • Supported borate
  • Surface chemistry

ASJC Scopus subject areas

  • Chemistry(all)

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