The previously unresolved 3J(CC) coupling between the imidazole C-2 and the C-β carbons of histidine has been observed in [90%-13C-2]histidine as a function of pH; comparison of the results with theoretical finite perturbation theory INDO calculations indicates significant hydrogen bonding from the amino to imidazole units at neutral pH.
R. E. London, J. Chem. Soc., Chem. Commun., 1978, 1070 DOI: 10.1039/C39780001070
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