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Halogen bonding and triiodide asymmetry in cocrystals of triphenylmethylphosphonium triiodide with organoiodines

Abstract

A family of cocrystals based on triphenylmethylphosphonium cations (PPh3Me+), triiodide anions (I3-), and organoiodine molecules tetraiodoethylene (TIE), 1,4-diiodotetrafluorobenzene (p-F4DIB), and 1,2-diiodotetrafluorobenzene (o-F4DIB) have been synthesized and structurally characterized. The triidodide anion has not been extensively studied previously for its halogen bonding tendencies, but it is intriguing for applications involving crystal engineering and structural design because of its inherent directionality. The present work begins to form a basis set of compounds to understand the role of halogen bonding with other intermolecular interactions, such as phenyl embraces, as complementary long-range interactions. In particular, these cocrystals feature type II I···I halogen bonding between the triiodide and organoiodine molecules, resulting in a variety of long range structural features including isolated halogen-bonded units, infinite chains, and three-dimensional frameworks. These networks are reinforced through edge→face and face···face phenyl embraces based on the packing of the cations. Asymmetry of the triiodide anions is observed, and is associated with the halogen bonding interactions that occur in the structures.

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Publication details

The article was received on 20 Mar 2018, accepted on 27 Apr 2018 and first published on 02 May 2018


Article type: Paper
DOI: 10.1039/C8NJ01373J
Citation: New J. Chem., 2018, Accepted Manuscript
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    Halogen bonding and triiodide asymmetry in cocrystals of triphenylmethylphosphonium triiodide with organoiodines

    K. Kobra, S. O'Donnell, A. Ferrari, C. McMillen and W. Pennington, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01373J

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