Structure determination of zinc iodide complexes formed in aqueous solution |
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| Authors: | Hisanobu Wakita Georg Johansson Magnus Sandström Peter L Goggin Hitoshi Ohtaki |
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| Institution: | (1) Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, 814-01 Fukuoka, Japan;(2) Coordination Chemistry Laboratories, Institute for Molecular Science, 444 Myodaiji, Okazaki, Japan;(3) Present address: Department of Inorganic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden;(4) School of Chemistry, The University, BS8 1TS Bristol, U.K. |
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| Abstract: | Structures of the complexes formed in aqueous solutions between zinc(II) and iodide ions have been determined from large-angle X-ray scattering, Raman and far-IR measurements. The coordination in the hydrated Zn2+ hexaaqua ion and the first iodide complex, ZnI]+, is octahedral, but is changed into tetrahedral in the higher complexes, ZnI2(H2O)2], ZnI3(H2O)]– and ZnI4]2–. The Zn-I bond length is 2.635(4)Å in the ZnI4]2– ion and slightly shorter, 2.592(6)Å, in the two lower tetrahedral complexes. In the octahedral ZnI(H2O)5]+ complex the Zn-I bond length is 2.90(1)Å. The Zn-O bonding distances in the complexes are approximately the same as that in the hydrated Zn2+ ion, 2.10(1)Å. |
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| Keywords: | Large angle X-ray diffraction Raman spectra far-IR spectra structure of zinc(II) iodide complexes hydration of zinc(II) ions |
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