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Abstract:
By introducing dipolar recoupling methods to high-resolution magic-angle spinning (HRMAS) NMR spectroscopy, a class of experiments has been delevoped that allows the measurement of residual dipole-dipole couplings of ~1 Hz in weakly immobilized molecules. Using homonuclear 1H-1H recoupling, distances of up to ~8 Å can be selectively determined, while heteronuclear 1H-13C recoupling provides access to dynamic order parameters of individual molecular segments on the order of ~10-3. The experiments are demonstrated on functionalized oligopeptides that are attached to polymer resins.
