13C CP/MAS NMR
Aromatic azo derivatives
Analytical Chemistry and Spectroscopy
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
13C 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.
Type of Medium: