Table 2. Hydrogen-bond geometry (, ) for (2) .

DHA	DH	HA	D A	DHA
C4H4AN20i	0.93	2.66	3.540(7)	159
C7H7CBr1	0.96	3.06	3.500(8)	110
C8H8AO3ii	0.97	2.30	3.219(9)	157
N10H10N20	0.90	2.54	3.427(6)	169
N10H10O1	0.90	1.98	2.857(7)	166
N10H10O2	0.90	2.43	3.181(8)	142
C14H14ABr1iii	0.93	2.88	3.687(6)	146
C16H16AO1iv	0.96	2.65	3.511(10)	150
C17H17AO3ii	0.96	2.55	3.485(10)	164
C17H17CBr1	0.96	2.98	3.459(8)	112
C18H18AO2	0.97	2.52	3.358(9)	144
C18H18BO1iv	0.97	2.65	3.468(8)	142
C19H19BO3iv	0.97	2.47	3.099(9)	122

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