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The solvation of the mercury(II) ion—a 199Hg NMR study

✍ Scribed by Mikhail Maliarik; Ingmar Persson

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
166 KB
Volume
43
Category
Article
ISSN
0749-1581

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✦ Synopsis

The solvation of the mercury(II) ion in solvents with different solvation properties, water, dimethylsulfoxide, N,N-dimethylthioformamide, and liquid ammonia, has been studied by means of 199 Hg NMR. The 199 Hg chemical shift shows a pronounced dependence on the coordination number of the mercury(II) ion in the solvates resulting in a difference of over 1200 ppm between basically tetrahedral and octahedral complexes. The chemical shifts can furthermore be associated with electron-pair donor properties of the solvents. The spin-lattice relaxation times of the 199 Hg nucleus in the solvates have been measured at different applied magnetic fields, concentrations, temperatures, and isotope substitutions. Possible mechanisms for the 199 Hg relaxation were proposed and the chemical shielding anisotropy in the solvates has been estimated. The 199 Hg relaxation rates and the anisotropy are correlated with the structure of the solvate complexes in solution obtained from recent LAXS and EXAFS studies.

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