Table 2. Selected geometric parameters (Å, °) for form II .
| Co1—N1 | 1.9521 (13) | Co1—N11 | 2.0057 (12) | 
| Co1—N2 | 1.9535 (14) | Co1—N21 | 2.0013 (12) | 
| N1—Co1—N2 | 117.81 (6) | N2—Co1—N21 | 106.71 (5) | 
| N1—Co1—N11 | 105.83 (5) | N21—Co1—N11 | 112.36 (5) | 
| N1—Co1—N21 | 105.41 (5) | C1—N1—Co1 | 168.56 (12) | 
| N2—Co1—N11 | 108.82 (5) | C2—N2—Co1 | 175.34 (13) |