期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 19, 页码 3340-3344出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz501699h
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资金
- NSF-RUI [CHE-1012813]
- NSFMRI [DMR-0922588]
- Camille and Henry Dreyfus Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1012813] Funding Source: National Science Foundation
A detailed understanding of the mechanism of organic cocrystal formation remains elusive. Techniques that interrogate a reacting system in situ are preferred, though experimentally challenging. We report here the results of a solid-state in situ NMR study of the spontaneous formation of a cocrystal between a pharmaceutical mimic (caffeine) and a coformer (malonic acid). Using C-13 magic angle spinning NMR, we show that the formation of the cocrystal may be tracked in real time. We find no direct evidence for a short-lived, chemical shift-resolved amorphous solid intermediate. However, changes in the line width and line center of the malonic acid methylene resonance, in the course of the reaction, provide subtle clues to the mode of mass transfer that underlies cocrystal formation.
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