Applications of advanced solid-state NMR methods for probing intermolecular interactions, notably hydrogen bonding are presented: Homonuclear 1H-1H double-quantum (DQ) experiments reveal proximities (typically under 3.5 Angstroms) among pairs of hydrogen atoms, for example distinguishing between ribbon-like or quartet-like self assembly in guanosine supramolecular structures [1-2] or pushing the limit of detection for a minority solid-state form of a pharmaceutical molecule . 14N-1H spectra show one-bond NH connectivities or additionally longer-range NH proximities depending on the recoupling time employed: Applications to guanosine self assembly , a pharmaceutical  and to probe the stability of a fumarate salt  are shown.
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