Abstract
Abstract13C 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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