Investigation on dissociation equilibrium of pyridone azo dyes by ^15N NMR and ir spectroscopy

Chin. J. Org. Chem. ›› 1993, Vol. 13 ›› Issue (3): 255-259. Previous Articles Next Articles

Original Articles

吡啶酮系偶氮染料解离平衡的^15NNMR和IR波谱

彭勤纪;刘辉;李慕洁;王璧人

大连理工大学化工学院

发布日期:1993-06-25

Investigation on dissociation equilibrium of pyridone azo dyes by ^15N NMR and ir spectroscopy

PENG QINJI;LIU HUI;LI MUJIE;WANG BIREN

Published:1993-06-25

Abstract

The chem. shifts of b-nitrogen atom in 15N-NMR spectra of four 15N-enriched pyridone azo dyes were reported and the correlation between the chem. shifts of 15N atom and the pH values was studied. When the solution changed from acidic to basic, the chem. shifts of b-15N atom shifted from 366-380 ppm to ~500 ppm, corresponding to an equilibrium shift from hydrazone form to azo anion structure of the dyes. The relative content of hydrazone structure was calculated based on the chem. shifts at different pH values. The acid-base dissociation equilibrium of these compounds was confirmed by IR spectra. The two carbonyl absorptions of the compounds in solid state under acid or neutral conditions changed to one carbonyl band under basic condition. The absorption bands of other functional groups showed corresponding change with the shift of equilibrium

Key words: CHEMICAL SHIFT, GLAND, AZO DYES, C13 NMR SPECTROMETRY, PYRIDINONE P, BENZENE AZO COMPOUNDS, INFRARED SPECTROPHOTOMETRY

CLC Number:

TQ61

Cite this article

PENG QINJI;LIU HUI;LI MUJIE;WANG BIREN. Investigation on dissociation equilibrium of pyridone azo dyes by ^15N NMR and ir spectroscopy[J]. Chin. J. Org. Chem., 1993, 13(3): 255-259.

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吡啶酮系偶氮染料解离平衡的^15NNMR和IR波谱

Investigation on dissociation equilibrium of pyridone azo dyes by ^15N NMR and ir spectroscopy

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