A functional model for lanthanide doped silicate materials: synthesis of an apically substituted samarium silsesquioxane complex

P L Arnold, A J Blake, S N Hall, B D Ward, C Wilson, Polly Arnold

Research output: Contribution to journalArticlepeer-review

Abstract

Steric protection of a trisilanol silsesquioxane (also referred to as a silasesquioxane) by one TBDMS group (SiMe2But) generated a new siloxanolate ligand, (c-C5H9)(7)Si7O9(OH)(2)(OTBDMS) 1, that allows only restricted access to a co-ordinated metal. Lithiation afforded the stable complex (c-C5H9)(7)Si7O9(OLi)(2)(OTBDMS), which has allowed the generation of a samarium adduct [Sm(OC6H3Bu2t-2,6){(c-C5H9)(7)Si7O9(O)(OLi)(OTBDMS)}(2)]. A structural study of this samarium adduct revealed two unusual features: an absence of stabilising M-O interactions with the siloxane core, and retention of one apical aryloxide group at the trivalent metal, through which the chemistry of a silica-functionalised Ln(3+) ion might be modelled. X-Ray crystallography also revealed the dimeric hydrogen bonded structure of the disilanol ligands. The disilanol ligand 1 may also readily be converted into a dithallium salt, providing a potential precursor for further f-element derivatives of this disilanolate moiety.

Original languageEnglish
Pages (from-to)488-491
Number of pages4
JournalJournal of the chemical society-Dalton transactions
Issue number4
DOIs
Publication statusPublished - 2001

Keywords

  • STRUCTURAL CHARACTERIZATION
  • CHEMISTRY
  • CATALYSTS
  • SURFACES
  • OLIGOSILSESQUIOXANE
  • REACTIVITY
  • PRECURSORS
  • LIGANDS
  • METAL

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