Summary
The d electron configuration for a complex of a d6 metal ion with weak and strong field ligands are shown below at the left. Note that the complex with the strong field ligand is diamagnetic.
| eg |   |
| t2g |  |
| weak field ligand high spin d6 complex such as CoF63– | |
| eg | |
| t2g | |
| strong field ligand low spin d6complex such as Co(CN)63– | |
As shown below the electron configuration for d8 complexes doesn't depend on the field strength of the ligand. Similarly d9 doesn't depend on ligand field strength.
| eg | |
| t2g | |
| weak field ligand | |
| eg | |
| t2g | |
| strong field ligand | |