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Laboratory EXAFS determined structure of the stable complexes in the ternary Ni(II)-EDTA-CN- system

Abstract

Aqueous solutions of the ternary system Ni(II)-EDTA-CN- are investigated with X-ray Absorption Spectroscopy (XAS) as a function of cyanide concentration with an enhanced laboratory von Hámos X-ray spectrometer. The near-edge structure of the spectra identifies unambiguously the formation of the pentacyanidonickel(II) complex at excess CN- concentrations. An analysis of the extended energy range of the XAS spectra reveals the molecular structure of the distinct molecular components present and provides a detailed description of the barely detectable mixed ligand [NiEDTA(CN)]3- complex. This thorough Extended X-ray Absorption Fine Structure (EXAFS) study demonstrates the potential of the emerging laboratory XAS spectrometers to become routine probes in various areas of chemistry, materials science, physics and related disciplines.

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Publication details

The article was received on 18 Feb 2019, accepted on 08 Apr 2019 and first published on 11 Apr 2019


Article type: Paper
DOI: 10.1039/C9CP00982E
Citation: Phys. Chem. Chem. Phys., 2019, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Laboratory EXAFS determined structure of the stable complexes in the ternary Ni(II)-EDTA-CN- system

    Z. Németh, É. Bajnóczi, B. Csilla and G. Vanko, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP00982E

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