Abstract
The structure of CH 3HgOH in an aqueous solution of pH = 9 was determined by an X-ray scattering technique at 25 °C. Linear methylmercury(II) hydroxide species is confirmed to predominate, and no polynuclear complexes are found. The 2.06(2) Å (HgO) and 2.04(3) Å (HgC) distances in the methylmercury(II) complex can not be significantly separated from each other. These bond distances are in good agreement with those found in the gaseous and solid phases in related compounds. Water is totally absent from the inner coordination sphere of mercury. The solvation occurs through hydrogen bondings to the hydroxide group and through van der Waals forces to the molecule. Distribution equilibria between air and water, Henry's law constants, for methylmercury(II) complexes are compared with the derived structural information on the solvated complexes. Raman spectroscopy has been used qualitatively to identify methylmercury(II) hydroxide in the experimental solution prior to the scattering study.
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