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The formation of a pair of extended networks sustained by halogen bonds based upon two regioisomers of a photoproduct, namely rctt -1,3-bis(4-pyridyl)-2,4-bis(phenyl)cyclobutane ( ht -PP) and rctt -1,2-bis(4-pyridyl)-3,4-bis(phenyl)cyclobutane ( hh -PP), that have varied topology is reported. These networks are held together via I⋯N halogen bonds between the photoproduct and the halogen-bond donor 1,4-diiodoperchlorobenzene (C 6 I 2 Cl 4 ). The observed topology in each solid is controlled by the regiochemical position of the halogen-bond accepting 4-pyridyl group. This paper demonstrates the ability to vary the topology of molecular networks by altering the position of the halogen bond acceptor within the cyclobutane-based node.

Controlling Topology within Halogen-Bonded Networks by Varying the Regiochemistry of the Cyclobutane-Based Nodes