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Synthesis, structural characterization, and crystal structure of bis(triphenylsulfonium)tetrachlorocuprate(II) Bennett, Grace Gaines, Kennedy Barry, Morgan Gillican, Mark Padgett, Clifford Lynch, Will Copper Synthesis Complex ion Crystal structure Triphenylsulfonium X-ray crystallography The synthesis and crystal structure of bis(triphenylsulfonium)tetrachlorocuprate(II) are reported. Single-crystal X-ray diffraction analysis revealed that the compound crystallizes in the monoclinic crystal system, space group Pn, with unit-cell parameters a = 10.4463(1) Å, b = 10.0143(1) Å, c = 16.0734(1) Å, β = 99.090(1)°, V = 1660.36(3) Å3, and Z = 2. The asymmetric unit consists of two crystallographically independent triphenylsulfonium cations and one tetrachlorocuprate(II) anion. Both sulfonium centers adopt distorted trigonal-pyramidal geometries, with S-C bond lengths ranging from 1.779(4) to 1.792(4) Å and C-S-C bond angles between 103.6(2) and 105.40(19)°. The [CuCl4]2- anion exhibits a significantly distorted tetrahedral geometry characterized by Cu-Cl bond lengths of 2.2364(13)-2.2723(11) Å, Cl-Cu-Cl bond angles of 96.15(5)-139.70(5)°, and a τ4 value of 0.59, indicative of a flattened tetrahedral (seesaw-like) coordination environment. The observed structural parameters are consistent with those reported for related triphenylsulfonium and tetrachlorocuprate(II) salts, confirming the characteristic distortion of the [CuCl4]2- unit in this class of compounds. Atlanta Publishing House LLC 2026-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf text/plain https://www.eurjchem.com/index.php/eurjchem/article/view/2760 10.5155/eurjchem.17.3.205-209.2760 European Journal of Chemistry; Vol. 17 No. 3 (2026): September 2026; 205-209 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/2760/3057 https://www.eurjchem.com/index.php/eurjchem/article/view/2760/3058 Copyright (c) 2026 Grace Bennett, Kennedy Gaines, Morgan Barry, Mark Gillican, Clifford Padgett, Will Lynch https://creativecommons.org/licenses/by-nc/4.0