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Keywords:

  • Phosphinines;
  • Titania;
  • Silica;
  • Immobilisation;
  • NMR spectroscopy;
  • Gold

Abstract

Phosphinines with pendant phenol or catechol functionalities and their gold(I) complexes were synthesised and characterised by spectroscopic data and in one case by a single-crystal X-ray diffraction study. Reactions of ligands or complexes with TiO2 or chloropropyl modified hexagonal mesoporous silica were then studied with the aim to immobilise ligands or complexes on the carrier by covalent tethering. 31P MAS NMR studies revealed that immobilisation on TiO2 was accompanied by complete degradation of the phosphinine moiety. Base induced coupling with chloropropyl modified silica produced a material that contained a mixture of several surface-bound phosphorus compounds. 31P MAS NMR studies revealed that approx. 40 % of the ligand had retained its integrity whereas the remaining fraction had been converted into further, not unambiguously identified structures.