Halogen Bonding Between Anions: Association of Anion Radicals of Tetraiodo‐ p ‐benzoquinone with Iodide Anions

Autor:	Tristan Maxson, Almaz S. Jalilov, Matthias Zeller, Sergiy V. Rosokha
Rok vydání:	2020
Předmět:	chemistry.chemical_classification Halogen bond 010405 organic chemistry Chemistry Iodide Halide chemistry.chemical_element General Chemistry General Medicine 010402 general chemistry Iodine Photochemistry 01 natural sciences Benzoquinone Catalysis 0104 chemical sciences law.invention Solvent law Halogen Electron paramagnetic resonance
Zdroj:	Angewandte Chemie. 132:17350-17354
ISSN:	1521-3757 0044-8249
Popis:	Halogen bonding between two negatively charged species, tetraiodo-p-benzoquinone anion radicals (I4 Q-. ) and iodide anions, was observed and characterized for the first time. X-ray structural and EPR/UV-Vis spectral studies revealed that the anion-anion bonding led to the formation of crystals comprising 2D layers of I4 Q-. anion radicals linked by iodides and separated by Et4 N+ counter-ions. Computational analysis suggested that the seemingly antielectrostatic halogen bonds in these systems were formed via a combination of several factors. First, an attenuation of the interionic repulsion by the solvent facilitated close approach of the anions leading to their mutual polarization. This resulted in the appearance of positively charged areas (σ-holes) on the surface of the iodine substituents in I4 Q-. responsible for the attractive interaction. Finally, the solid-state associations were also stabilized by multicenter (4:4) halogen bonding between I4 Q-. and iodide.
Databáze:	OpenAIRE
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