3D ~15N-~13C-~13C Chemical Shift Correlation Spectroscopy in Rotating Solids

摘要

We describe 3D solid state MAS NMR experiments which separate chemical shifts in one ~15N and two ~13C dimensions. The polarization transfer from ~1H to ~15N, and subsequently to ~13C, is accomplished with recently developed techniques which overcome the shortcomings of constant amplitude Hartmann-Hahn cross polarization. Homonuclear (~13C-~13C) recoupling is performed with the MELODRAMA sequence.