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|Title:||On trialkyl sulfonium salts of triiodomercury(II) and structure of the trimethyl salt|
|Keywords:||Triiodomercuric ion;Mercury;Trimethyl sulfonium salt;Crystal structure;Tricoordination;Supramolecular interactions|
|Abstract:||The salt, [Me3S][HgI3], is a text book example of the relatively rare phenomenon of tricoordination among transition metal complexes of simple ligands. It was structurally characterized decades after P C Rây’s formulation of the [R3S] [HgI3] family of salts in 1930. We now report its structure at low temperature (150 K). The [Me3S]+ and [HgI3]- ions are respectively pyramidal and trigonal planar. The span of the three Hg-I distances and the three I-Hg-I angles are 2.69-2.74 Å and 110-125o respectively. The Hg atom is 0.12 Å displaced from the plane of the iodine atoms. Weak supramolecular Hg---I interactions among adjacent molecules are present in the lattice and these influence the trend of bond lengths and angles in the [HgI3]- ion. The S-C distances and C-S-C angles in the cation span the ranges 1.75-1.81 Å and 100-103o respectively.|
|Appears in Collections:||IJC-A Vol.52A(10) [October 2013]|
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