Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C8H8Cl1i | 0.93 | 2.79 | 3.472(7) | 132 |
| C6H6Cl1ii | 0.93 | 2.83 | 3.673(7) | 151 |
| C3H3Br1iii | 0.93 | 3.13 | 3.797(8) | 131 |
| C4H4Cl1iv | 0.93 | 2.94 | 3.529(7) | 122 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
; (iv) 
.
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