Application of deuteriated isotopomers in the analysis of13C CP/MAS NMR spectra of some azo dyes

Autor:	Jaroslav Straka, Josef Jirman, Antonín Lyčka, Bohdan Schneider
Rok vydání:	1991
Předmět:	Crystallography chemistry.chemical_compound Azobenzene Chemistry Stereochemistry Solid-state General Materials Science Aromaticity General Chemistry Nuclear magnetic resonance spectroscopy Spectral line Isotopomers
Zdroj:	Magnetic Resonance in Chemistry. 29:500-505
ISSN:	1097-458X 0749-1581
DOI:	10.1002/mrc.1260290515
Popis:	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.
Databáze:	OpenAIRE
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