Peloquin AJ, Kobra K, Li Y, McMillen CD, Pennington WT. Halogen Bonding of Organoiodines and Triiodide Anions in (NMe
3 Ph)
+ Salts.
Chempluschem 2021;
86:612-621. [PMID:
33830671 DOI:
10.1002/cplu.202100096]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/26/2021] [Indexed: 11/08/2022]
Abstract
To study the role of the triiodide (I3 )- anion in establishing various halogen bonding patterns, the trimethylphenylammonium iodide (NMe3 PhI) salt was reacted with diiodine (I2 ) in the presence of a series of organoiodines, tetraiodoethylene (TIE), 1,2-diiodo-3,4,5,6-tetrafluorobenzene (o-F4 DIB), 1,4-diiodo-2,3,5,6-tetrafluorobenzene (p-F4 DIB), and 1,3,5-trifluoro-2,4,6-triiodobenzene (1,3,5-F3 I3 B) to form cocrystals of the organoiodines with the trimethylphenylammonium triiodide (NMe3 PhI3 ) salt. Single-crystal X-ray crystallography revealed the (I3 )- anion served as a halogen bond acceptor for the organoiodine donors, forming a variety of 1-D, 2-D, and 3-D packing arrangements through I⋅⋅⋅I halogen bonding. Significant asymmetry was observed within the (I3 )- anion. The melting points of the cocrystalline materials, as determined by simultaneous DSC/TGA, ranged from 43 °C to 119 °C and showed a strong dependence on the identity of the organoiodine incorporated into the crystal lattice.
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