2023-06-132023-06-132023Bosch, E., Unruh, D.K., Santana, C.L., & Groeneman, R.H.. 2023. Halogen-bonded co-crystal containing 1,3-diiodo-perchlorobenzene and the photoproduct rtct-tetrakis(pyridin-4-yl)cyclobutane resulting in a zigzag topology. Acta Crystallographica Section E: Crystallographic Communications, 79(Pt 3). https://doi.org/10.1107/S2056989023001408https://doi.org/10.1107/S2056989023001408https://hdl.handle.net/2346/94074© 2023 International Union of Crystallography. All rights reserved. cc-byThe formation and crystal structure of a zigzag network held together by I• • •N halogen bonds is reported. In particular, the halogen-bond donor is 1,3-diiodoperchlorobenzene (C6I2Cl4) while the acceptor is the photoproduct rtct-tetrakis(pyridin-4-yl)cyclobutane (TPCB). Curiously, within the resulting co-crystal (C6I2Cl4)•(TPCB), the photoproduct accepts only two halogen bonds between neighbouring 4-pyridyl rings and as a result behaves as a bent two-connected node rather than the expected four-connected centre. In addition, the photoproduct, TPCB, is also found to engage in C—H• • •N hydrogen bonds, forming an extended zigzag chain.engco-crystalcyclobutanehalogen bondingorganic solid statephotoproductzigzag network[2 + 2] cycloaddition reactionArticle