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

IUCrJ

Sinnwell, M.A.¹ 

[1] Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA

关键词: SOLID-STATE REACTIVITY;    HALOGEN BONDS;    PHOTODIMERIZATION;    SUPRAMOLECULAR CHEMISTRY;    SINGLE-CRYSTAL-TO-SINGLE-CRYSTAL REACTION;    CRYSTAL ENGINEERING;    CO-CRYSTALS;    ORGANIC SOLID-STATE REACTIONS;    FRAMEWORK-STRUCTURED SOLIDS AND AMORPHOUS MATERIALS;    MOLECULAR;   

DOI  :  10.1107/S2052252518007583

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

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.

【 授权许可】

CC BY