The Structure of the Hydrated Gallium(III), Indium(III), and Chromium(III) Ions in Aqueous Solution. A Large Angle X-ray Scattering and EXAFS Study.

摘要: The structure of the hydrated gallium(III), indium(III), and chromium(III) ions has been determined in aqueous perchlorate nitrate solutions by means large-angle X-ray scattering (LAXS) extended absorption fine (EXAFS) techniques. EXAFS studies have performed over a wide concentration range, 0.005-1.0 mol.dm(-)(3) (2.6 for chromium(III)), while LAXS are restricted to concentrated solutions, ca. 1.5 mol.dm(-)(3). All three metal were found coordinate six water molecules, each which hydrogen bonded two molecules second hydration sphere. metal-oxygen bond distance first sphere was methods be 1.959(6), 2.131(7), 1.966(8) A. data gave mean M.O distances 4.05(1), 4.13(1), 4.08(2) A ions, respectively. ion 4.5(7) with O.O 3.05(2) Cl.O 3.68(3) Analyses Ga, In, Cr K-edge showed no influence on shell M-O change or anion. minor contribution from is obscured multiple within tightly shell. alum salts CsM(SO(4))(2).12H(2)O, M = Ga length hexahydrated gallium(III) indium(III) 1.957(2) 2.122(2) A,