title: Indirect covariance NMR spectroscopy of through-bond homo-nuclear correlations for quadrupolar nuclei in solids under high-resolution.
abstract: Indirect covariance NMR spectroscopy is demonstrated in solids, and we show that it can be used to obtain through-bond 2D homo-nuclear correlation spectra for quadrupolar nuclei under high-resolution. These spectra, generated with indirect covariance from a hetero-nuclear correlation spectrum, are equivalent to those recorded with the through-bond homo-nuclear hetero-nuclear single-quantum correlation (H-HSQC) method very recently proposed. However, the indirect covariance method can save a lot of experiment time, compared to the H-HSQC experiments, which allows introducing a high-resolution quadrupolar filter, thus providing a much better resolution, even on medium-field spectrometers. The covariance concept can be used to generate many different "indirectly-detected" high-resolution homo-nuclear correlation spectra with through-space or through-bond correlations for spin 1/2 or quadrupolar nuclei. We also propose a simple method that decreases the noise in all (direct or indirect) covariance methods.
authors.affiliation: UCCS, CNRS-8181, Lille University, FR-59652 Villeneuve d'Ascq, France.
authors.forename: Bingwen
authors.initials: B
authors.lastname: Hu
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Amoureux
authors.forename: Julien
authors.initials: J
authors.lastname: Trebosc
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D009686:Nuclear Physics