Characterization of the structure and dynamics of an aqueous Hg solution by an ab initio molecular dynamics study |
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Authors: | Viwat VchirawongkwinChinapong Kritayakornupong Anan Tongraar |
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Institution: | a Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailandb Department of Chemistry, Faculty of Science, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailandc School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand |
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Abstract: | Quantum mechanical charge field (QMCF) MD simulation has been performed to investigate the structure and dynamics of Hg2+ hydrate. The first-shell hexacoordinated Hg(H2O)6]2+ complex with an average Hg2+-O distance of 2.40 Å is dominantly found, which corresponds to the neutron diffraction and extended X-ray absorption fine structure (EXAFS) experiments. Other species, in particular the 7-fold coordinated complexes, can be formed transiently, according to the water exchange processes with an associative interchange (Ia) mechanism. The second hydration shell exhibits a Hg2+-O distance of 4.6 Å with a coordination number of ~ 14. The mean residence times (MRTs) of first- and second-shell waters clearly indicate a strong “structure-forming” ability of Hg2+ in aqueous solution. |
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Keywords: | QMCF MD Dissociative interchange Structure-making |
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