Ultra-high-resolution multiple-pulse 1H NMR of organic conductors

Abstract

it is shown that the use of multiple-pulse decoupling and magic-angle spinning can give extremely highly resolved ¹H NMR spectra of some organic conductors. Although the scaled linewidths approach 2.5 ppm, the dispersion of the resonances, due to large Knight shifts, is an order of magnitude larger than the usual 'H chemical-shift dispersion. This point is illustrated with spectra from two TCNQ salts in which up to eight chemically equivalent ¹H's, distinguished only by the amount of resident spin density on the bound carbon, are resolved.