metal-oxygen (MO) bond distance in the first hydration sphere 1.966: second sphere MO distance 4.08 Å
||Lindqvist-Reis P, Muñoz-Páez A, Díaz-Moreno S, Pattanaik S, Persson I, Sandström M. 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. Inorg Chem. 1998 Dec 28 37(26):6675-6683 abstractPubMed ID11670798
||Abstract: "The structure of the hydrated gallium(III), indium(III), and chromium(III) ions has been determined in aqueous perchlorate and nitrate solutions by means of the large-angle X-ray scattering (LAXS) and extended X-ray absorption fine structure (EXAFS) techniques."
||Abstract: "The metal-oxygen bond distance in the first hydration sphere of the gallium(III), indium(III), and chromium(III) ions was determined by LAXS and EXAFS methods to be 1.959(6), 2.131(7), and 1.966(8) Å. The LAXS data gave mean second sphere M.O distances of 4.05(1), 4.13(1), and 4.08(2) Å for the gallium(III), indium(III), and chromium(III) ions, respectively."