ArticleChemistry (Weinheim an der Bergstrasse, Germany)2026
Conversion Between 2- and 3-Dimensional Halogen-Bonded Networks Formed From a Single N-Oxide/Iodoalkyne Building Block.
Article in Chemistry (Weinheim an der Bergstrasse, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Despite their promise as porous supramolecular materials, permanently porous halogen-bonded frameworks have not been realized, and progress in the field is limited by a lack of understanding of what happens when these materials are activated via solvent exchange or under vacuum. In the current work, a single building block bearing complementary iodoalkyne halogen bond donors and pyridine-N-oxide acceptors is described. Crystallization is solvent dependent, with initial experiments giving networks containing unwanted hydrogen bonding interactions between components. Subsequent optimization of conditions enabled the generation of a 3D network assembled by only halogen bonds. Upon solvent exchange, the 3D network undergoes an unprecedented single-crystal transformation to a new 2D phase. Synchrotron far-infrared spectroscopy was employed to identify diagnostic signals for the phase transition. These results add to our understanding of the dynamic nature of halogen-bonded network materials.
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