Abstract
The structures of 1,3 bis‐(allyl)cytosinium bromide (1), 7,9 bis‐(allyl)adeninium bromide hydrate (2) and 3‐(butenyl)adeninium bromide (3) have been determined. 1 is dimeric via N―H…Br hydrogen bonds, which further associate into ribbons via weaker C―H…Br interactions. 2 is also dimeric, now from N―H…N hydrogen bonds, which build up further through a complex array of hydrogen bonds involving both the anion and water of crystallization (O―H…N, O―H…Br, C―H…Br). 3 does not dimerise but forms polymeric sheets via a series of N―H…N, C―H…N and C―H…Br hydrogen bonds.
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