Structural flexibility of halogen bonds showed in a single-crystal-to-single-crystal [2+2] photodimerization

IUCrJ
Michael A SinnwellLeonard R MacGillivray

Abstract

Halogen bonds have emerged as noncovalent forces that govern the assembly of molecules in organic solids with a degree of reliability akin to hydrogen bonds. Although the structure-directing roles of halogen bonds are often compared to hydrogen bonds, general knowledge concerning the fundamental structural behavior of halogen bonds has had limited opportunity to develop. Following an investigation of solid-state reactions involving organic syntheses and the development of photoresponsive materials, this work demonstrates the ability of the components of intermolecular N⋯I halogen bonding - a 'workhorse' interaction for the crystal engineer - to support a single-crystal-to-single-crystal [2+2] photodimerization. A comparison is provided of the geometric changes experienced by the halogen-bonded components in the single-crystal reaction to the current crystal landscape of N⋯I halogen bonds, as derived from the Cambridge Structural Database. Specifically, a linear-to-bent type of deformation of the halogen-bonded components was observed, which is expected to support the development of functional halogen-bonded materials containing molecules that can undergo movements in close-packed crystal environments.

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Citations

Oct 11, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Jay Quentin, Leonard R MacGillivray
Oct 23, 2019·Chemistry : a European Journal·David BulfieldStefan Matthias Huber
Jun 6, 2020·Acta Crystallographica. Section C, Structural Chemistry·Eric BoschRyan H Groeneman
Nov 18, 2018·IUCrJ·Gautam R Desiraju
Jun 13, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ian B HutchisonIain D H Oswald
Jan 17, 2020·Chemistry : a European Journal·Thanh Binh NguyenPascal Retailleau

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