Simultaneous homonuclear and heteronuclear spin decoupling in magic-angle spinning solid-state NMR.

We show here an effective way of implementing simultaneously homonuclear and heteronuclear dipolar decoupling in magic-angle spinning (MAS) solid-state NMR. Whilst the homonuclear spin decoupling is applied on the 1 H channel, heteronuclear spin decoupling is applied on the 13 C channel. The 1 H spins are observed in a windowed fashion in this case. The resultant 1 H spectrum has higher resolution due to the attenuation of broadening arising from both homonuclear 1 H-1 H and heteronuclear 1 H-13 C interactions, with the latter normally leading to additional line broadening in 13 C labelled samples. The experiments are performed at MAS frequencies of ca. 60 kHz.