Hydration, acidity and metal complexing of polysulfide species: a first principles molecular dynamics study

Xiandong Liu*, Michiel Sprik, Jun Cheng

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We report a first principles molecular dynamics study on hydration and acidity of polysulfide species. Hydration structures of (poly)sulfides species are pictured by analyzing the trajectories. With the vertical energy gap technique, our calculations reproduce the acidity constants of H2S and predict chain length independent acidity for polysulfanes: pKa(1)s are about 7.0 and pKa(2)s are around 9.0. This indicates H2Sn, HSn and S-n(2) can all be dominant under common pH. Furthermore, our simulations show that stable Au+-HSn complexes can form in solutions, which implies that polysulfides can perform as metal complexing agents in hydrothermal processes. (C) 2013 Elsevier B. V. All rights reserved.

Original languageEnglish
Pages (from-to)9-14
Number of pages6
JournalChemical Physics Letters
Volume563
Early online date4 Feb 2013
DOIs
Publication statusPublished - 20 Mar 2013

Keywords

  • 2nd dissociation-constant
  • aqueous-solutions
  • sulfide solutions
  • hydrogen-sulfide
  • geologic role
  • PK(A) values
  • density
  • sulfur
  • surface
  • fluids

Cite this