Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C2H2Cl1i | 0.93 | 2.90 | 3.756(6) | 154 |
| C3H3O2ii | 0.93 | 2.65 | 3.517(7) | 156 |
| C6H6O2iii | 0.98 | 2.59 | 3.548(8) | 165 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
.
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