Table 2. Selected geometric parameters (Å, °) for 2 .
| Ni1—N1 | 2.0435 (18) | Ni1—N31 | 2.1250 (17) |
| Ni1—N2 | 2.0526 (18) | Ni1—N41 | 2.1262 (17) |
| Ni1—N21 | 2.1157 (16) | Ni1—N11 | 2.1316 (17) |
| N1—Ni1—N2 | 178.69 (7) | N21—Ni1—N41 | 179.30 (7) |
| N1—Ni1—N21 | 90.21 (7) | N31—Ni1—N41 | 90.22 (7) |
| N2—Ni1—N21 | 90.67 (7) | N1—Ni1—N11 | 91.28 (7) |
| N1—Ni1—N31 | 89.06 (7) | N2—Ni1—N11 | 89.71 (7) |
| N2—Ni1—N31 | 89.98 (7) | N21—Ni1—N11 | 88.91 (6) |
| N21—Ni1—N31 | 89.16 (6) | N31—Ni1—N11 | 178.04 (6) |
| N1—Ni1—N41 | 89.46 (7) | N41—Ni1—N11 | 91.72 (7) |
| N2—Ni1—N41 | 89.65 (7) |