New Developments in Magic-Angle Spinning NMR Spectroscopy: Cylinders, Spheres, and Sapphires
To obtain high-resolution spectra of solids using nuclear magnetic resonance (NMR) spectroscopy, a technique known as magic-angle spinning (MAS) is used to average out anisotropic nuclear spin interactions. Typically, cylindrical sample rotors made from zirconia are spun rapidly using compressed gases about an axis inclined at the “magic angle,” or 54.7356º, with respect to the magnetic field. Recently, a new paradigm for MAS experiments has been developed: spherical rotors. Spherical rotors have a number of unique advantages over their cylindrical counterparts, such as stable rotation, improved sample access and exchange, and the ability to be spun using fully 3D-printed hardware. Additionally, by changing the rotor material from zirconia to single-crystal sapphire (a-Al2O3), the precise angle at which the rotor spins can easily be monitored in situ by 27Al NMR.
Hosted by Professor Richard Remsing