Synthesis, spectrophotometry, and X-ray diffraction studies of a new salt: p-xylylenebis(tetrahydrothiophenium) bis(triiodide)

Organoiodine complexes: Structural and functional variety

“…106 Despite a wealth of data on the compositions and structures of polyhalides of organic cations 107-109 and molecular iodine complexes, 8 their crystallographic examination remains very intensive. For instance, the crystal and molecular structures of N cetylpyridinium interhalides, 54 N propylisoquinolinium diiodine bro mide, 85 N methyl(ethyl)quinolinium triiodides, 37,54 N,N diethylbenzimidazolium triiodide, 110 3 carboxy propyl(triphenyl)phosphonium diiodine bromide, 103 tetra phenylphosphonium diiodine bromide, 90 and p xylylene bis(tetrahydrothiophenium) triiodide 91 have been deter mined in recent years. It follows from the data presented above that the mo lecular formula, size, shape, and stability of the polyiodine halide ion and the way of its coordination by an outer sphere organic cation depend on the nature and symme try of the cationic environment, the ability of a solvating solvent to form complexes with iodine, and the conditions of the synthesis.…”