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Detailed Spectrophotometric Study of Copper(I1) Halides in Anhydrous Methanol

Abstract : A spectrophotometric study of the copper(I1) chlorides and the copper(I1) bromides in anhydrous methanol was carried out at 25 "C and at constant ionic strength (1 mo1.L-I). A matrix rank treatment of the experimental data followed by the testing of different theoretical models confirmed the presence of four mononuclear complexes for both systems, viz. C u X ' , CuX2, CuX3-, and CuXz-. Overall stability constants calculated for the chlorocuprates are PI = 2.8 X lo2, b2 = 1.6 X IO4, 8, = 2.3 X los, and P4 = 4.5 X lo5 and for the bromocuprates are PI = 5.2 X lo', P2 = 3.9 X IO5, P3 = 2.0 X lo6, and b4 = 2.1 X lo6. Individual electronic spectra of all species in methanol are reported for the first time. In this solvent the tetracoordinated chloro complex exhibits a calculated absorption maximum in the near-IR region consistent with a square-planar structure, in contrast to the structure in the solid state, while for the tetrabromocuprate the structure of a flattened tetrahedron is confirmed.
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https://hal.univ-angers.fr/hal-03165326
Contributeur : Mustayeen Khan <>
Soumis le : vendredi 12 mars 2021 - 13:15:45
Dernière modification le : jeudi 18 mars 2021 - 03:23:45
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M Khan, J Meullemeestre, M Schwing, F Vierling. Detailed Spectrophotometric Study of Copper(I1) Halides in Anhydrous Methanol. Inorganic Chemistry, American Chemical Society, 1989, 28, pp.3306-3309. ⟨10.1021/ic00316a011⟩. ⟨hal-03165326⟩

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