Table 3: Chemical shifts δ (ppm) relative to DMSO.
| Compound | δO−H | δN−H | δHa | δHb | δHc | δHd | δHe | δHf |
| L | 12.96 | 10.44 | 6.44 | 6.26 | 7.66 | 7.39 | 7.39 | 7.66 |
| 6.29 | 6.28 | 7.64 | 7.38 | 7.38 | 7.64 | |||
| Mo(CO)4L | — | 10.62 | 6.27 | 6.31 | 7.36 | 7.39 | 7.39 | 7.36 |
| 6.42 | 6.46 | 7.63 | 7.66 | 7.66 | 7.63 | |||
| W(CO)4L | — | 10.61 | 6.24 | 6.28 | 7.56 | 7.59 | 7.59 | 7.56 |
| 6.64 | 6.68 | 7.65 | 7.68 | 7.68 | 7.65 | |||