The molecular structure of aqueous Hg(II)-EDTA As determined by x-ray absorption spectroscopy

Sara A. Thomas, Jean François Gaillard*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The widespread presence and persistence of ethylenediaminetetraacetic acid (EDTA) in aquatic environments can lead to the formation of metal-EDTA complexes that influence metal bioavailability and mobility. Recently, the Hg(II)-EDTA complex was observed to slightly promote the biouptake of Hg(II) to the bacterium Escherichia coli and to undergo a relatively quick ligand exchange reaction with thiols at the bacterial cell membrane. The reactivity of a metal complex depends on its molecular structure; however, the molecular structure of aqueous Hg(II)-EDTA has yet to be reported. Here, we use X-ray absorption spectroscopy to determine the molecular structure of aqueous Hg(II)-EDTA. Our results suggest that aqueous Hg(II)-EDTA displays distorted octahedral geometry with one water molecule in the coordination sphere.

Original languageEnglish (US)
Pages (from-to)2878-2884
Number of pages7
JournalJournal of Physical Chemistry A
Volume119
Issue number12
DOIs
StatePublished - Mar 26 2015

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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