Dye No. | Yield (%) | Melt pt. (˚C) | UV-visible Spectroscopy | Selected frequency | |
λmax(nm) | ε × 104 (mol−1・cm−1) | ||||
1 | 60.7 | 138 | 500 | 4.9729 | OH 3747, 3245: -C-H 3090, 2972, 2853: -N=N- 1550, 1587: -COOH 1792, 1665: -N=O 1550 |
2 | 77.9 | 170 - 172 | 420 | 3.9418 | OH 3744: -C-H 3087, 2969, 2853 -N=N- 1442: -N=O 1559. |
3 | 40.9 | 152 | 505 | 5.4242 | OH 3739, 3235: -C-H 2969, 2854: -N=N- 1552, 1587: -N=O 1552: -SO3H 1101, 1142. |
4 | 88.5 | 129 - 131 | 425 | 4.5970 | OH 3188: -C-H 3078, 2968: -N=N- 1589: -N=O 1514: -NO2 1332. |
5 | 85.1 | 152 - 153 | 440 | 4.4910 | OH 3745, 3244: -C-H 3090, 2972: -N=N- 1551, 1589: -N=O 1551: -SO3H 1139, 1231. |
6 | 83.0 | 117 - 119 | 415 | 4.1549 | OH 3616, 3367: -C-H 3068: -N=O 1458, 1509: -OCH3 2840, 2941. |
7 | 59.0 | 147 - 149 | 510 | 5.1206 | OH 3724, 3244: -C-H 3090, 2972: -N=N- 1553, 1587: -N=O 1434: -SO3H 1142, 1232. |
8 | 85.0 | 146 - 148 | 560 | 2.8139 | OH 3204: -C-H 3083: -N=O 1436, 1561 |