| [NR]2− | [NPR3]− | |
| Fe⋯Fe | 2.61-2.69 Å < | 2.73-2.81 Å |
| N⋯N | 2.89-2.94 Å < | 3.04-3.07 Å |
| Fe-N-Fe | 83.4-84.9° ≈ | 83.1-85.4° |
| Fe4 | 2.09-2.29 Å3 < | 2.39-2.61 Å3 |
| N4 | 2.83-3.01 Å3 < | 3.29-3.40 Å3 |
| Fe4N4 | 6.93-7.49 Å3 < | 8.06-8.45 Å3 |
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