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IR spectral data of compounds 1–10.
| Compounds | Keto-enol (cm−1) | -CH=C- (cm−1) |
C-H Stretch (cm−1) |
C-H Bending (cm−1) |
Vibrations M-O (cm−1) |
|---|---|---|---|---|---|
| DAC | 1755 and 1795 | 966 | - | - | - |
| DACH4 | 1757 and 1797 | - | 2966–2841 | - | - |
| DiMeOC | 1620 and 1663 | 964 | - | - | - |
| DiBcOC | 1625 and 1730 | 970 | - | 849–694 | - |
| PhCurcu | 1619 and 1670 | 968 | - | - | - |
| DAC-Cu | - | - | - | - | 1514 and 484 |
| DACH4-Cu | - | - | - | - | 1508 and 467 |
| DiMeOC-Cu | - | - | - | - | 1506 and 463 |
| DiBcOC-Cu | - | - | - | - | 1501 and 465 |
| PhCurcu-Cu | - | - | - | - | 1511 and 420 |
