¹⁰⁹Ag NMR chemical shift as a descriptor for Bronsted acidity from molecules to materials.

ABSTRACT: Molecular-level understanding of the acid/base properties of heterogeneous catalysts requires the development of selective spectroscopic probes to establish structure-activity relationships. In this work we show that substituting the surface protons in oxide supports by isolobal N-heterocyclic carbene (NHC) Ag cations and measuring their ¹⁰⁹Ag nuclear magnetic resonance (NMR) signatures enables to probe the speciation and to evaluate the corresponding Brønsted acidity of the substituted OH surface sites. Specifically, a series of silver N-heterocyclic carbene (NHC) Ag(i) complexes of general formula [(NHC)AgX] are synthesized and characterized, showing that the ¹⁰⁹Ag NMR chemical shift of the series correlates with the Brønsted acidity of the conjugate acid of X^-

SUBMITTER: Hansen C 

PROVIDER: S-EPMC10882518 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature