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Carbon-13 and nitrogen-15 solution- and solid-state NMR of some sulphonated azobenzene dyestuffs

✍ Scribed by A. Margaret Chippendale; Gary McGeorge; Robin K. Harris; Colin M. Brennan

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 141 KB
Volume: 37
Category: Article
ISSN: 0749-1581
DOI: 10.1002/(sici)1097-458x(199903)37:3<232::aid-mrc441>3.0.co;2-#

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✦ Synopsis

The free acids and sodium salts of a series of sulphonated azobenzene dyestu †s were examined in the solid and solution states by 13C and 15N NMR spectroscopy. In solution the spectra of both the free acids and salts are characteristic of trans-azobenzene structures, as are the spectra of the solid samples of the salts. However, the spectra obtained from solid samples of the free acids are very di †erent and are interpreted in terms of resonance structures of the azonium tautomers.

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