Exploiting the Joint Action of Chemical Shielding and Heteronuclear Dipolar Interactions To Probe the Geometries of Strongly Hydrogen‐Bonded Silanols

Abstract

Magic probes: The geometry of strongly hydrogen bonded silanols in octosilicate can be probed by exploiting the 1H NMR distance correlations together with the joint effects of 29Si chemical shielding and dipolar 1H–29Si interactions. Dipolar‐modulated, slow magic‐angle spinning 29Si NMR spectra allow the determination of Si⋅⋅⋅H distances, the magnitude of the 29Si chemical‐shielding tensor, and its orientation in the molecular frame.