Bis[(E)-1-methyl-4-styrylpyridinium] 4-bromobenzenesulfonate iodide

Abstract

In the title compound, 2C14H14N+·C6H4BrO3S−·I−, two crystallographically independent cations exist in an E configuration with respect to the C=C ethenyl bond. One cation is approximately planar, whereas the other is twisted slightly, the dihedral angles between the pyridinium and phenyl rings of each cation being 0.96 (15) and 7.05 (16)°. In the crystal structure, the cations are stacked in an anti­parallel manner along the a axis through weak C—H⋯π inter­actions and π–π inter­actions, with centroid–centroid distances of 3.5544 (19) and 3.699 (2) Å. The 4-bromobenzene­sulfonate anions and the cations are linked together by weak C—H⋯O inter­actions. A short Br⋯I contact [3.6373 (4) Å] and C—H⋯I interactions are also observed.

“Anti‐electrostatic” Halogen Bonding between Ions of Like Charge

“…[47] Similar to the other polyhalides, structural features of these associations are significantly affected by counterions, which are also critical for the stabilization of the I 4 2À dianion. [43] The analogous Br 4 2À also WUJGAM [13] 8 I I À 3.331 0.797 177.5 WUJGIU [13] 8 I Cl À 3.022 0.797 173.6 I Cl À 3.051 0.805 175.2 WUJGOA [13] 8 I I À 3.337 0.806 177.6 I I À 3.416 0.817 171.8 FUWFOV [15] 17 I I À 3.920 0.938 169.0 TUPKIZ [39] 18 Br I À 3.637 0.930 172.4 DISJOE [40] 19 Cl NO 3 À 3.137 0.959 145.9 ). [41] b) Self-assembled chains of bis (triethylhydroxyphosphonium) bis(triethylphosphine oxide) bis(m 2 -iodo)-tetraiodo-di-tellurium (Ref.…”