Table 2. π–π stacking interactions (Å, °).
| Cgi | Cgj | Centroid distance | Interplanar spacing i | αii | γiii |
|---|---|---|---|---|---|
| Cg1 | Cg2iv | 3.487 (2) | 3.322 | 2.68 | 15.42 |
| Cg2 | Cg1iv | 3.487 (2) | 3.361 | 2.68 | 17.68 |
| Cg3 | Cg3iv | 3.710 (2) | 3.382 | 0.00 | 24.27 |
| Cg1 | Cg4v | 3.689 (2) | 3.336 | 5.01 | 25.28 |
| Cg4 | Cg1v | 3.689 (2) | 3.397 | 5.01 | 22.98 |
Notes: (i) perpendicular distance between the centroid of the first ring and the plane of the second ring; (ii) dihedral angle between the plane of the first ring and the plane of the second ring; (iii) angle between the centroid of the first ring and the normal to the plane of the second ring; (iv) symmetry code: 
; (v) symmetry code: 
. Cg1 is the centroid of atoms N1/C1/N2/C13/C14, Cg2 is the centroid of atoms N3/C12/C4–C6/C11, Cg3 is the centroid of atoms N2/C1–C4/C12 and Cg4 is the centroid of atoms C6–C11.