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• W4386467045 endingPage "8049" @default.
• W4386467045 startingPage "8032" @default.
• W4386467045 abstract "Understanding the nature of the interaction between mercury(II) ions, Hg2+, and water molecules is crucial to describe the stability and chemical behavior of structures formed during solvation, as well as the conditions that favor the Hg2+ coordination or inducing water hydrolysis. In our study, we explored exhaustively the potential energy surface of Hg2+ with up to six water molecules. We analyzed electronic and Gibbs free energies, binding, and nuclear magnetic resonance parameters. We used the zeroth-order regular approximation Hamiltonian, including scalar and spin–orbit relativistic corrections for free energy calculations and geometry optimizations to explore the interplay between electron correlation and relativistic effects. We analyzed intermolecular interactions with energy decomposition analysis, quantum theory of atoms in molecules, and natural bond orbital. Additionally, we used the four-component Dirac Hamiltonian to compute solvent effect on the magnetic shielding and J-coupling constants. Our results revealed that the water hydrolysis by Hg2+ requires a minimum of three water molecules. We found that the interaction between Hg2+ and water molecules is an orbital interaction due to relativistic effects and the most stable structures are opened-shape clusters, reducing the number of oxygen–mercury contacts and maximizing the formation of hydrogen bonds among water molecules. In these types of clusters, Hg2+ promotes the water hydrolysis over coordination with oxygen atoms. However, when we considered the change associated with the transfer of a cluster from the ideal gas to a solvated system, our solvation free energy analysis revealed that closed-shape clusters are more favorable, maximizing the number of oxygen–mercury contacts and reducing the formation of hydrogen bonds among water molecules. This finding suggests that, under room conditions, the coordination of Hg2+ is more favorable than hydrolysis. Our results have significant implications for understanding Hg2+ behavior in water, helping to develop targeted strategies for mercury remediation and management, and contributing to advancements in the broader field of environmental chemistry." @default.
• W4386467045 created "2023-09-07" @default.
• W4386467045 creator A5006403757 @default.
• W4386467045 creator A5011449413 @default.
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• W4386467045 creator A5032788720 @default.
• W4386467045 creator A5057179267 @default.
• W4386467045 creator A5085703622 @default.
• W4386467045 date "2023-09-06" @default.
• W4386467045 modified "2023-10-16" @default.
• W4386467045 title "Coordination of Mercury(II) in Water Promoted over Hydrolysis in Solvated Clusters [Hg(H₂O)_1–6]_(aq)²⁺: Insights from Relativistic Effects and Free Energy Analysis" @default.
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