Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C4H4AN1i | 0.95 | 2.47 | 3.376(3) | 159 |
| C12H12AN2i | 0.95 | 2.60 | 3.449(2) | 150 |
| C20H20AN3i | 0.95 | 2.54 | 3.490(3) | 178 |
Symmetry code: (i) 
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