직/편성물 염색

Investigations on decolorization products of azo dyes by sodium sulfite

  • 출판일1997.02
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 269
Decolorization of two azo dyes (C.I.Acid Orange 7 [1a] and C.I.Acid Orange 20 [2a] by sodium sulfite solution was pursued photometrically at 30℃. The initial decolorization products showing absorption maxima at 413nm for la and 374 nm for 2a were isolated as tetrabutylammonium ion-complexes soluble in organic solvents. The measurements of the ¹H-NMR and the two-dimensional COSY spectra revealed that the products were not hydrazobenzene derivatives which had been suggested so far, but Michael adducts of sodium sulfite to hydrazo-form of the dyes. The IR data also supported the structures.
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