Table 1. Selected geometric parameters (Å, °).
| Ni1—O4 | 2.0172 (16) | Ni1—O5 | 2.114 (2) |
| Ni1—O6 | 2.0622 (18) | Ni1—N1 | 2.145 (2) |
| Ni1—N2 | 2.069 (2) | O4—C4 | 1.263 (3) |
| Ni1—O7 | 2.0768 (17) | O1—C1 | 1.250 (3) |
| O4—Ni1—N2 | 165.11 (9) | O4—Ni1—N1 | 108.35 (8) |
| O6—Ni1—O7 | 174.18 (7) | N2—Ni1—N1 | 85.82 (9) |
| O6—Ni1—O5 | 95.59 (8) | O5—Ni1—N1 | 162.10 (8) |
| Ni1—O4—C4—O3 | 29.5 (4) | Ni1—N1—C10—C9 | 36.8 (3) |
| Ni1—O4—C4—C3 | −147.4 (2) | Ni1—O7—C12—C11 | 56.1 (2) |