MULTIPLE-QUANTUM FILTERING AND SPIN-EXCHANGE IN SOLID-STATE NUCLEAR-MAGNETIC-RESONANCE

Multiple quantum NMR of coupled spin-1/2 nuclei in a solid has been ex ploited as a filter to separate different magnetization components in a spatially heterogeneous system. After filtering, the spins labeled a ccording to coherence orders were used to follow the track of spin exc hange between different domains. In order to avoid time-consuming two- dimensional experiments, this exchange was detected in a one-dimension al experiment via selective detection of multiple quantum coherences. The technique was demonstrated for samples of solid adamantane in cont act with its saturated solution in benzene-d(6) and for a high-density polyoxymethylene. (C) 1998 American Institute of Physics. [S0021-9606 (98)01019-8].