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Measured 13C tensor principal and isotropic shift values for the COOH groups in the polymorphs of palmitic acid evaluated here.
| Phase | δ11 (ppm) | δ22 (ppm) | δ33 (ppm) | δiso. (ppm) |
|---|---|---|---|---|
| A2 | 256.1 | 177.8 | 106.3 | 180.71 |
| As | — | — | — | 180.18 |
| — | — | — | 180.58a | |
| — | — | — | 180.85 | |
| — | — | — | 181.27 | |
| — | — | — | 181.44 | |
| Bm | 257.9 | 174.5 | 109.3 | 180.56 |
| C | 233.5 | 203.3 | 109.1 | 181.98 |
| Em | 251.9 | 176.6 | 113.7 | 180.73 |
This resonance represents approximately 27% of a form matching the isotropic shift of Bm.
