Chemical bonds and functional groups | Absorption peaks (cm−1) |
---|---|
Rosiglitazone | |
 C=O bonds in thiolactone and lactam | 1738.37, 1694.06 |
 Aromatic oxide | 1246.73 |
 =C–H bonds in benzene and pyridine ring | 812.24, 763.19 |
 N–H bond | 3416.43 |
Metformin | |
 C=NH bond | 1622.80 |
 N–H bond | 3392.57 |
 N–H bending vibration | 1583.69, 1568.35 |
 Dimethyl anti-symmetric vibration | 1487.91, 1475.28 |
 Dimethyl symmetric vibration | 1448.73, 1418.94 |
 NH2 bond | 3294.66 |
The mixture of rosiglitazone and metformin | |
 N–H bond | 3372.64 |
 NH2 bond | 3182.02 |
C=O bonds in thiolactone and lactam | 1748.05, 1705.50 |
 Aromatic oxide | 1253.85 |
 =C–H bonds in benzene and pyridine ring | 823.37, 721.51 |
 C=NH bond | 1623.37 |
Rosiglitazone metformin adduct | |
 C=O bonds in thiolactone and lactam | 1676.56, 1643.85 |
 C=NH bond | 1600.40 |
 NH2 bond | 3185.41 |
 N–H bond | 3386.60 |
 N–H bending vibration | 1572.51, 1557.97 |
 Aromatic oxide | 1243.95 |
 =C–H bonds in benzene and pyridine ring | 824.15, 774.06 |