Abstract
Two-dimensional heteronuclear correlation spectroscopy is applied to coupled carbon and nitrogen nuclei in single crystals of amino acids and peptides. High resolution is available because the spectra have the carbon chemical shift along one frequency axis and the nitrogen chemical shift (and the second-order quadrupole shift in the case of 14N) along the second frequency axis. These two-dimensional spectra enable direct measurements of resonance frequencies and dipole-dipole couplings that are useful in providing information about the structure, dynamics, and spectral characteristics of molecules.
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