Table 2. π–π-stacking interaction parameters (Å, °).
| Ring 1 | Ring No. | Ring 2 | Ring No. | Angle | Centroid–centroid distance | Shift distance between ring centroids |
|---|---|---|---|---|---|---|
| C1–C6 | 1 | C1–C6(−x + 1, −y, −z + 2) | 1 | 0.000 | 3.874 | 1.459 |
| C13–C18 | 3 | N1/C1/C6–C9(−x + 1, −y + 1, −z + 1) | 2 | 4.772 | 3.711 | 1.480 |
| N2/C18/C10–C13(−x, −y + 1, −z + 1) | 4 | 0.590 | 3.665 | 1.602 | ||
| N1/C1/C6–C9 | 2 | N2/C18/C10–C13(−x + 1, −y + 1, −z + 1) | 4 | 5.301 | 3.564 | 1.139 |
| C13–C18(−x + 1, −y + 1, −z + 1) | 3 | 4.772 | 3.711 | 1.283 | ||
| N2/C18/C10–C13 | 4 | N2/C18/C10–C13(−x, −y + 1, −z + 1) | 4 | 0.000 | 3.652 | 1.555 |
| C13–C18(−x, −y + 1, −z + 1) | 3 | 0.590 | 3.665 | 1.579 | ||
| N1/C1/C6–C9(−x + 1, −y + 1, −z + 1) | 2 | 5.301 | 3.564 | 1.068 |