Abstract
NH modes are examined for porphins and simpler compounds. The NH frequency is found to vary smoothly in the sequence pyrrole to phihalocyanin, which cannot be explained in terms of an intramolecular hydrogen bond. The effects are ascribed to conjugation and formation of a macro ring.
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Gurinovich, I.F. Intramolecular hydrogen bonds in compounds of porphin type. J Appl Spectrosc 6, 435–437 (1967). https://doi.org/10.1007/BF00707521
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DOI: https://doi.org/10.1007/BF00707521