Table 1. Selected bond lengths (Å).
| Ni1—N5 | 2.100 (4) | Ni2—N4 | 2.079 (4) |
| Ni1—N2 | 2.070 (4) | Ni3—C11 | 1.874 (6) |
| Ni1—N1 | 2.082 (4) | Ni3—C12 | 1.857 (6) |
| Ni2—N3 | 2.069 (4) | Ni4—C13 | 1.866 (6) |
| Ni2—N7 | 2.095 (4) | Ni4—C14 | 1.863 (6) |
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