Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
N1H1ACl4i	0.86	2.64	3.400(4)	148
N1H1BCl3ii	0.86	2.47	3.317(3)	169
N2HN2Cl4i	0.86	2.42	3.238(3)	160
N3HN3Cl1iii	0.86	2.42	3.251(3)	164
N4H4ACl1iii	0.86	2.77	3.519(4)	147
N4H4BCl2iv	0.86	2.80	3.541(4)	145

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) .