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Application of deuteriated isotopomers in the analysis of 13C CP/MAS NMR spectra of some azo dyes

✍ Scribed by Jaroslav Straka; Bohdan Schneider; Antonín Lyčka; Josef Jirman

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
520 KB
Volume
29
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

^13^C CP/MAS NMR spectra (50.3 MHz) of 4‐[N,N‐bis(2‐hydroxyethyl)amino]azobenzene (1), (N,N‐dimethylamino)azobenzene (2), 4‐methoxyazobenzene (3), 2‐hydroxy‐5‐tert‐butylazobenzene (4) and 4‐hydroxyazobenzene (5) were recorded. The isotopomers of 1, 4 and 5 with pentadeuteriated unsubstituted aromatic rings were also studied. Dipolar dephased spectra of the deuteriated isotopomers were used for chemical shift interpretation in the solid state. The changes in cross‐polarization dynamics caused by deuteration were investigated for 1. The spectra of 1, 2, 3, and 5 were also measured at elevated temperature. It was found that in 1, 2 and 5, rotation of the aromatic rings is induced at elevated temperature.

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