Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C9H9F2 | 0.95 | 2.47 | 2.882(4) | 106 |
| C13H13F3 | 0.95 | 2.45 | 2.865(3) | 107 |
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