Doublehyphen;quantum homonuclear rotary resonance: Efficient dipolar recovery in magichyphen;angle spinning nuclear magnetic resonance

摘要

We describe an efficient method for the recovery of homonuclear dipolendash;dipole interactions in magichyphen;angle spinning NMR. Doublehyphen;quantum homonuclear rotary resonance (2Qhyphen;HORROR) is established by fulfilling the condition ohgr;r=2ohgr;1, where ohgr;ris the sample rotation frequency and ohgr;1is the nutation frequency around an applied resonant radio frequency (rf) field. This resonance can be used for doublehyphen;quantum filtering and measurement of homonuclear dipolar interactions in the presence of magichyphen;angle spinning. The spin dynamics depend only weakly on crystallite orientation allowing good performance for powder samples. Chemical shift effects are suppressed to zeroth order. The method is demonstrated for singly and doubly13C labeledLhyphen;alanine.