| | Dye number | 1H- (ppm, DMSO-d6) | FT-IR (cm−1, KBr) | MS (m/e) |
| | 3a | 2.30 (s, 3H, pyr CH3) | 3245 (N–H), 3070 (Ar C–H), | 393 [M]+ (%100) | | 7.35 (m, 2H, bth) | | | | 7.48 (m, 2H, bth) | | 7.59 (d, 1H, bth) | | 7.87 (t, 1H, bth) | 2915 (Al C–H), 1682 (C=O) | 258 (%33) | | 7.94 (d, 1H, bth) | 1595, 1523 (C=C, C=N) | | | 8.05 (t, 1H, bth) | | | 14.94 (b, NH) |
| | 3b | 2.30 (s, 3H, pyr CH3) | 3212 (N–H), 3062 (Ar C–H), | 427 [M]+ (%100) | | 7.33–8.14 (m, 7H, Ar CH) | 2994, 2978 (Al C–H) | | | 15.00 (b, NH) | 1684 (C=O), 1597, 1523 (C=C, C=N) | 258 (%31) |
| | 2.40 (s, 3H, pyr CH3) | 3453 (N–H), 3070 (Ar C–H), 2940 (Al C–H) | 423 [M]+ (%100) | | 3.90 (s, 3H, bth OCH3) | | | | 7.00–8.10 (m, 7H, Ar CH) | 1670 (C=O), 1606, 1529 (C=C, C=N) | 79 (%10) |
| | 3d | 2.31 (s, 6H, dimetbth 2xCH3) | 3420 (N–H), 3060 (Ar C–H), | 421 [M]+ (%100) | | 2.47 (s, 3H, pyr CH3) | 2968, 2919 (Al C–H), 1638 (C=O) | | | 7.42 (t, 1H, bth) | 1557, 1519 (C=C, C=N) | 258 (%16) | | 7.52 (s, 1H, dimetbth) | | | | 7.61 (s, 1H, dimetbth) | | 7.79 (d, 1H, bth) |
| | 3e | 2.41 (s, 3H, pyr CH3) | 3416 (N–H), 3194 (benzimidazole N–H), | 376 [M]+ (%100) | | 7.21–7.97 (m, 6H, Ar CH) | 3057 (Ar C–H), 2935 (Al C–H), | | | 13.30 (b, bimi NH) | 1658 (C=O), 1621, 1570 (C=C, C=N) | 258 (%43) |
| | 3f | 2.33 (s, 6H, dimetbimi-2xCH3) | 3390 (N–H), 3147 (benzimidazole N–H), | 404 [M]+ (%100) | | 2.42 (s, 3H, pyr CH3) | 3021 (Ar C–H) | | | 7.34–8.14 (m, 6H, Ar CH) | 2967 (Al C–H), 1669 (C=O), | 258 (%10) | | 13.23 (b, dimethylbenzimidazole NH) | 1616, 1529 (C=C, C=N) | |
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