Table 8. Selected π–π contacts (Å, °) for compounds (2b), (3b) (molecule 1), (4a) and (4d).
Cg1, Cg2 and Cg3(Cg7) are the centroids of the pyrone, of the chromone phenyl and of the carboxamide phenyl rings, respectively. * indicates contacts in which the planes involved are inclined to each other, the perpendicular distance between the planes is an average value and the angle between the planes is given in place of a slippage. Only interplanar interactions with Cg⋯Cg distances less than or equal to 4.0 Å or with angles between the planes of less than 10° are included.
| Compound | contacts | distance | perp. distance | Slippage* |
|---|---|---|---|---|
| (2b) | Cg1⋯Cg1iii | 3.859 (3) | 3.4223* | 4.0 (13)* |
| Cg1⋯Cg2iv | 3.564 (3) | 3.3951* | 3.86 (13)* | |
| Cg2⋯Cg2iv | 3.674 (3) | 3.4035* | 4.0 (13)* | |
| Cg3⋯Cg3i | 3.649 (3) | 3.3049 (11) | 1.546 | |
| (3b) | Cg1⋯Cg3v | 3.6621 (17) | 3.4150* | 2.91 (13) |
| Cg2⋯Cg3vi | 3.6851 (18) | 3.3587* | 2.47 (14)* | |
| Cg2⋯Cg3v | 3.7278 (17) | 3.4360* | 2.47 (14)* | |
| (4a) | Cg2⋯Cg3ii | 3.780 (3) | 3.383* | 1.90 (6)* |
| (4d) | Cg1⋯Cg1vii | 3.4831 (7) | 3.3257 (4) | 1.035 |
| Cg1⋯Cg2Vii | 3.6037 (7) | 3.3137* | 2.46 (5)* | |
| (4e) | Cg1⋯Cg3vi | 3.669 (2) | 3.3741* | 3.50 (17)* |
| Cg1⋯Cg7v | 3.768 (2) | 3.3792* | 3.09 (17)* |
Symmetry codes: (i) 1 − x, 1 − y, 1 − z; (ii) 
− x, −
+ y, − z; (iii) x, − y, − + z; (iv) x, − y, + z; (v) 1 − x, 1 − y, −z; (vi) 1 − x, −y, −z; (vii) 1 − x, −y, 1 − z.