Probing intermolecular interactions in a DIETHYLCARBAMAZINE CITRATE (cas 1642-54-2) salt by fast MAS 1H solid-state NMR spectroscopy and GIPAW calculations
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Add time:08/06/2019 Source:sciencedirect.com
Fast magic-angle spinning (MAS) NMR is used to probe intermolecular interactions in a diethylcarbamazine salt, that is widely used as a treatment against adult worms of Wuchereria bancrofti which cause a common disease in tropical countries named filariasis. Specifically, a dihydrogen citrate salt that has improved thermal stability and solubility as compared to the free form is studied. One-dimensional 1H, 13C and 15N and two-dimensional 1H–13C and 14N–1H heteronuclear correlation NMR experiments under moderate and fast MAS together with GIPAW (CASTEP) calculations enable the assignment of the 1H, 13C and 14N/15N resonances. A two-dimensional 1H–1H double-quantum (DQ) –single-quantum (SQ) MAS spectrum recorded with BaBa recoupling at 60 kHz MAS identifies specific proton-proton proximities associated with citrate-citrate and citrate-diethylcarbamazine intermolecular interactions.
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