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| Assignment | Possible conditions | GBP absorption cm−1 | BBP absorption cm−1 | Reference |
|---|---|---|---|---|
| OH stretch | Inter- or intra-molecular H bonds | 3280 | 3232 | 48 |
| CH stretch | Saturated CH | 2934 | 2938 | 48 |
| COO− ion | Chelate structure with metal ions | 17, 27 and 48–50 | ||
| Asymmetric | 1570 | 1593 | ||
| Symmetric | 1379 | 1398 | ||
| C O stretch | ||||
| CO stretch | Any organics | 1046 | 1071 | 17 and 48 |
