Residual Dipolar Couplings by Off-Magic-Angle Spinning in Solid-State Nuclear Magnetic Resonance Spectroscopy

A solid-state NMR analogue of the solution-state residual dipolar coupling effect is demonstrated. A small misset of the spinning axis by less than 0.5° changes the modulation frequency of spin−echoes, allowing the estimation of internuclear dipole−dipole couplings and hence internuclear distances.