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International Journal of Interdisciplinary Research

Table 4 1 H-NMR chemical shift (ppm) of the purified Blue pigment

From: Extraction of Indigo dye from Couroupita guianensisand its application on cotton fabric

Peak no. Position of1H Chemical shift (ppm) Comment
1 H-1 4.054 Aromatic C-NH
2 H-5 8.486 1-benzene C-H
3 H-6 7.025 1-benzene C-H
4 H-7 7.458 1-benzene C-H
5 H-7′ 7.458 1-benzene C-H
6 H-6′ 7.025 1-benzene C-H
7 H-5′ 8.473 1-benzene C-H
8 H-1′ 4.054 Aromatic C-NH