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Formation of Strong Boron Lewis Acid Sites on Silica.
Samudrala, Kavyasripriya K; Akram, Manjur O; Dutton, Jason L; Martin, Caleb D; Conley, Matthew P.
Afiliación
  • Samudrala KK; Department of Chemistry, University of California, Riverside, California 92521, United States.
  • Akram MO; Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States.
  • Dutton JL; Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia.
  • Martin CD; Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States.
  • Conley MP; Department of Chemistry, University of California, Riverside, California 92521, United States.
Inorg Chem ; 63(11): 4939-4946, 2024 Mar 18.
Article en En | MEDLINE | ID: mdl-38451151
ABSTRACT
Bis(1-methyl-ortho-carboranyl)borane (HBMeoCb2) is a very strong Lewis acid that reacts with the isolated silanols present on silica partially dehydroxylated at 700 °C (SiO2-700) to form the well-defined Lewis site MeoCb2B(OSi≡) (1) and H2. 11B{1H} magic-angle spinning (MAS) nuclear magnetic resonance (NMR) data of 1 are consistent with that of a three-coordinate boron site. Contacting 1 with O═PEt3 (triethylphosphine oxide TEPO) and measuring 31P{1H} MAS NMR spectra show that 1 preserves the strong Lewis acidity of HBMeoCb2. Hydride ion affinity and fluoride ion affinity calculations using small molecules analogs of 1 also support the strong Lewis acidity of the boron sites in this material. Reactions of 1 with Cp2Hf(13CH3)2 show that the Lewis sites are capable of abstracting methide groups from Hf to form [Cp2Hf-13CH3][H313C-B(MeoCb2)OSi≡], but with a low overall efficiency.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Inorg Chem Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Inorg Chem Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos