Table 1. Selected bond lengths (Å).
| Cu2—O1 | 1.939 (3) |
| Cu2—O3 | 1.947 (2) |
| Cu2—N2 | 1.957 (3) |
| Cu2—N1 | 1.989 (3) |
| O1—Tb1 | 2.352 (2) |
| O2—Tb1 | 2.506 (3) |
| O3—Tb1 | 2.344 (3) |
| O4—Tb1 | 2.492 (2) |
| O5—Tb1 | 2.470 (3) |
| O7—Tb1 | 2.501 (3) |
| O8—Tb1 | 2.455 (3) |
| O10—Tb1 | 2.494 (3) |
| O11—Tb1 | 2.491 (3) |
| O13—Tb1 | 2.564 (3) |