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Title:Structure and population of complex ionic species in FeCl[sub]2 aqueous solution by X-ray absorption spectroscopy
Authors:ID Luin, Uroš (Author)
ID Arčon, Iztok (Author)
ID Valant, Matjaž (Author)
Files:URL https://www.mdpi.com/1420-3049/27/3/642
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Technologies for mass production require cheap and abundant materials such as ferrous chloride (FeCl2). The literature survey shows the lack of experimental studies to validate theoretical conclusions related to the population of ionic Fe-species in the aqueous FeCl2 solution. Here, we present an in situ X-ray absorption study of the structure of the ionic species in the FeCl2 aqueous solution at different concentrations (1–4 molL−1) and temperatures (25–80 ◦C). We found that at low temperature and low FeCl2 concentration, the octahedral first coordination sphere around Fe is occupied by one Cl ion at a distance of 2.33 (±0.02) Å and five water molecules at a distance of 2.095 (±0.005) Å. The structure of the ionic complex gradually changes with an increase in temperature and/or concentration. The apical water molecule is substituted by a chlorine ion to yield a neutral Fe[Cl2(H2O)4]0. The observed substitutional mechanism is facilitated by the presence of the intramolecular hydrogen bonds as well as entropic reasons. The transition from the single charged Fe[Cl(H2O)5]+ to the neutral Fe[Cl2(H2O)4]0 causes a significant drop in the solution conductivity, which well correlates with the existing conductivity models.
Keywords:structure, population, ionic species, aqueous ferrous chloride, in situ X-ray absorption spectroscopy
Year of publishing:2022
Number of pages:str. 1-13
Numbering:Vol. 27, iss. 3
PID:20.500.12556/RUNG-7149 New window
COBISS.SI-ID:94739203 New window
UDC:53
ISSN on article:1420-3049
DOI:10.3390/molecules27030642 New window
NUK URN:URN:SI:UNG:REP:SGGYJCGL
Publication date in RUNG:24.01.2022
Views:1667
Downloads:42
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Record is a part of a journal

Title:Molecules
Shortened title:Molecules
Publisher:MDPI
ISSN:1420-3049
COBISS.SI-ID:18462981 New window

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