Halogen-bonded zigzag mol-ecular network based upon 1,2-di-iodo-perchloro-benzene and the photoproduct rctt -1,3-bis-(pyridin-4-yl)-2,4-di-phenyl-cyclo-butane.

The formation and crystal structure of a zigzag mol-ecular network held together by I⋯N halogen bonds is reported. In particular, the halogen-bond donor is 1,2-di-iodo-perchloro-benzene ( 1,2-C 6 I 2 Cl 4 ) while the acceptor is a head-to-tail photoproduct, namely rctt -1,3-bis-(pyridin-4-yl)-2,4-di-phenyl-cyclo-butane ( ht -PP ). In this co-crystal ( 1,2-C 6 I 2 Cl 4 )·( ht -PP ), the donor acts as a bent two-connected node while the acceptor behaves as a linear linker to form the extended solid. Neighbouring chains pack in a tongue-and-groove-like pattern that engage in various Cl⋯π inter-actions to both the phenyl and pyridyl rings resulting in a supra-molecular two-dimensional sheet.