Table 4. Selected bond lengths (Å) from the final structure of pair (4).
| Ni1—O1 | 2.1279 (9) | Ni1—N3 | 2.0595 (11) |
| Ni1—O4 | 2.0733 (8) | Ni1—O2 | 2.1150 (10) |
| Ni1—N1 | 2.0625 (12) | Ni1—O3 | 2.1760 (9) |
| Ni1—O1 | 2.1279 (9) | Ni1—N3 | 2.0595 (11) |
| Ni1—O4 | 2.0733 (8) | Ni1—O2 | 2.1150 (10) |
| Ni1—N1 | 2.0625 (12) | Ni1—O3 | 2.1760 (9) |