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Research article - Peer-reviewed, 2019

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

Nemeth, Zoltan; Bajnoczi, Eva G.; Csilla, Bogdan; Vanko, Gyorgy


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 Ha ' mos 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.

Published in

Physical Chemistry Chemical Physics
2019, Volume: 21, number: 18, pages: 9239-9245

    UKÄ Subject classification

    Atom and Molecular Physics and Optics

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