Table 2. Comparison of selected (X-ray and DFT) geometric data (Å, °) for (I).
| Bonds/angles | X-ray | B3LYP/6–311G(d,p) |
|---|---|---|
| Br1—C1 | 1.8954 (19) | 1.94573 |
| Br2—C24 | 1.953 (3) | 2.02642 |
| O1—N4 | 1.224 (2) | 1.28476 |
| O2—N4 | 1.233 (2) | 1.28545 |
| N1—C5 | 1.357 (2) | 1.36426 |
| N1—C4 | 1.361 (2) | 1.42977 |
| N1—C13 | 1.473 (3) | 1.47563 |
| N2—C5 | 1.336 (2) | 1.35689 |
| N2—C6 | 1.372 (3) | 1.40945 |
| N3—C6 | 1.346 (2) | 1.40939 |
| N3—C1 | 1.372 (2) | 1.38222 |
| N4—C10 | 1.465 (2) | 1.42118 |
| C5—N1—C4 | 118.57 (17) | 117.37 |
| C5—N1—C13 | 119.67 (16) | 119.58 |
| C4—N1—C13 | 121.75 (17) | 120.96 |
| C5—N2—C6 | 100.79 (16) | 101.37 |
| C6—N3—C1 | 102.17 (16) | 101.96 |
| O1—N4—O2 | 123.30 (19) | 122.47 |
| O1—N4—C10 | 118.48 (18) | 118.78 |
| O2—N4—C10 | 118.22 (18) | 118.74 |
| N3—C1—C2 | 132.04 (18) | 133.14 |
| N3—C1—C5 | 107.59 (16) | 105.38 |
| C2—C1—C5 | 120.37 (18) | 121.46 |