Abstract
Solid-state NMR of rare nuclei such as carbon-13 has developed through the widespread use of cross polarization (CP) and magic angle spinning (MAS), as well as through the introduction of homo- or heteronuclear multidimensional correlation techniques based on the dominant through-space dipolar interactions. Indirect scalar couplings, although of smaller magnitude, are valuable probes of direct proximities, and their use has recently developed as an essential component in the assignment and characterization process of powdered solids. Homonuclear correlation experiments in which coherence transfers are exclusively mediated by the JCC couplings are reviewed. Their applicability on both crystalline and disordered materials is discussed, along with the possibility of measuring homonuclear scalar couplings in solids. Correlation experiments involving protons provide additional useful sources of information. Through-bond correlation techniques based on the JCH couplings and implemented for rigid solid compounds are presented and discussed in terms of sensitivity and selectivity. Keywords: scalar couplings; INADEQUATE; INEPT; proton decoupling; through-bond connectivities; linewidths in solids; indirect coupling; J coupling; heteronuclear coupling; homonuclear coupling; connectivities
Published Version
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