Laboratory EXAFS determined structure of the stable complexes in the ternary Ni(ii)–EDTA–CN− system
Literature Information
Zoltán Németh, Éva G. Bajnóczi, Bogdán Csilla, György Vankó
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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