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Characterization of the unsymmetrical trimer of indole-5-carboxylic acid by proton NMR spectroscopy

✍ Scribed by J. G. Mackintosh; A. R. Mount; D. Reed

Publisher: John Wiley and Sons
Year: 1994
Tongue: English
Weight: 237 KB
Volume: 32
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260320914

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✦ Synopsis

Abstract

Indole‐5‐carboxylic acid trimer, a major product formed during the electro‐polymerization of indole‐5 carboxylic acid, was characterized by ^1^H NMR spectros‐copy, and a wide range of one‐ and two‐dimensional NMR techniques were employed to allow full analysis of the ^1^H spectrum. Homonuclear NOE experiments were carried out in different solvents and at different temperatures, owing to the unusual observation of negative enhancements in some experiments. This was shown to be due to the slow tumbling rate of the molecule.

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