ISSN:
1945-7111
Content:
The speciation of Cr, Zn and Sn in AlCl3/1-ethyl-3-methylimidazolium chloride containing CrCl2, ZnCl2 and SnCl2, respectively, has been studied by cyclic voltammetry (CV), Raman spectroscopy and density functional theory (DFT) calculations. Addition of the respective metal salt causes the current waves in the CV to decrease, indicating a reaction of the metal salts with Al2Cl7−. Compared to the neat electrolyte, the Raman peaks of Al2Cl7− decrease while the AlCl4− peak increases in intensity, broadens and shifts towards lower wavenumbers. Calculated wavenumbers of metal complexes [Me(AlCl4)3]− reflect these observations. DFT calculations of the Gibbs free energies of formation, solvation and reaction support the formation of the proposed complexes. The central ions are coordinated by three bidentate AlCl4− ligands that are arranged planar-trigonally. Due to the occupied Sn-5s orbital, repulsive forces cause a trigonal-pyramidal geometry in case of the Sn complex. Based on the similarities in the experimental observations and the orbital configuration of Zn2+ compared to Cr2+, the spontaneous formation of the species [Cr(AlCl4)3]− can be assumed.
In:
Electrochemical Society, Journal of the Electrochemical Society, Bristol : IOP Publishing, 1948, 170(2023), 7, Artikel-ID 072503, 1945-7111
In:
volume:170
In:
year:2023
In:
number:7
In:
elocationid:072503
Language:
English
DOI:
10.1149/1945-7111/ace383
URL:
Volltext
(lizenzpflichtig)
Author information:
Ispas, Adriana 1977-
Author information:
Endres, Frank 1966-
Author information:
Mai, Sebastian
Author information:
Borisenko, Natalia 1980-
Author information:
Bund, Andreas 1969-
Author information:
Böttcher, René
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