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Carbon‐13 and nitrogen‐15 solution‐ and solid‐state NMR of some sulphonated azobenzene dyestuffs
Author(s) -
Chippendale A. Margaret,
McGeorge Gary,
Harris Robin K.,
Brennan Colin M.
Publication year - 1999
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199903)37:3<232::aid-mrc441>3.0.co;2-#
Subject(s) - chemistry , azobenzene , nitrogen , carbon fibers , solid state , carbon 13 nmr , polymer chemistry , photochemistry , organic chemistry , computational chemistry , molecule , materials science , composite number , composite material
The free acids and sodium salts of a series of sulphonatedazobenzene dyestuffs were examined in the solid and solution statesby 13 C and 15 N NMR spectroscopy. In solutionthe spectra of both the free acids and salts are characteristic of trans ‐azobenzene structures, as are the spectra of thesolid samples of the salts. However, the spectra obtained from solidsamples of the free acids are very different and are interpreted interms of resonance structures of the azonium tautomers. Copyright© 1999 John Wiley & Sons, Ltd.