Table 2. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C12H12F3ii | 0.93 | 2.60 | 3.444(7) | 151 |
| C18H18F4iii | 0.93 | 2.50 | 3.082(7) | 121 |
Symmetry codes: (ii) 
; (iii) 
.
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