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| Assignments | Cetirizine | CTZAN | CTMAN |
|---|---|---|---|
| v (O–H) | 3432 for O–H in carboxylic group | 3445 in the layer; H2O | 3442 |
| v (CH2) | 2984–2949 | 2958–2817 | 2958–2819 |
| v (COOH) | 1740 | - | - |
| v (ϕ. Para- subst.) | 1601 | 1601 | 1589 |
| v (ϕ. mono- subst.) | 1496, 1077 and 758 | 1487 | 1488 |
| v (C–Cl) | 1457 | 1452 | 1453 |
| v (C–O) in carboxylic group | 1435, 1383, 1356 and 1319 | - | - |
| 2 adj. ϕ | 846 and 809 | 853 and 805 | 853 and 805 |
| v (CH mono- subst.) | 758 | 758 | 758 |
| M-O | - | 428 | 446 |
| vas (COO−) | - | 1601 | 1589 |
| vs (COO−) | - | 1408 | 1408 |
