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Abstract
Solid-state carbon-13 NMR spectra have been measured for 2, 2'-bi-1H-imidazole to study with its proton exchange tautomerism in solid. The CP/MAS NMR spectra showed four peaks for the 4, 4', 5, and 5' carbons in the solid state in contrast to the single peak assigned to these carbons in solution. Therefore, the tautomerism was proved to be frozen in the solid state. A crystal field effect was considered to cause the extra splittings in these peaks.
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