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Issue 18, 2019
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Laboratory EXAFS determined structure of the stable complexes in the ternary Ni(ii)–EDTA–CN system

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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.

Graphical abstract: Laboratory EXAFS determined structure of the stable complexes in the ternary Ni(ii)–EDTA–CN− system

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Article information


Submitted
18 Feb 2019
Accepted
08 Apr 2019
First published
11 Apr 2019

This article is Open Access

Phys. Chem. Chem. Phys., 2019,21, 9239-9245
Article type
Paper

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

Z. Németh, É. G. Bajnóczi, B. Csilla and G. Vankó, Phys. Chem. Chem. Phys., 2019, 21, 9239
DOI: 10.1039/C9CP00982E

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