AlCl3-Alkali Chlorides

The melts obtained are frequently light-brown, although the voltammetric background currents are still quite low. The solvent reacts vigorously 

The deposition potentials of metals in the AlClg-NaCl-KCl (66-20-14 mole %) and in NaAlC have been studied by using cur- 

and other ions at a dropping mercury electrode in the AlClg-NaCl-KCl eutectic (60-26-14 mole %). Only a single reduction step was observed for both Co and Ni +. These results indicate that the Co( II) and Ni( II) species are not formed in this melt. Fremont et al. report half-wave potentials for the reduction of several metal ions. According to these workers the reduction of Ag+, Cu+, Pb +, and Sn + is reversible the reduction of Co +, Fe +, and Ni + is irreversible. 

Zn + in molten AlCla-LiCl-KCl (59.2-21.1-19.7 mole %). The processes were found to be reversible and the plots of E versus log[(/ — /)//] were straight lines with slopes corresponding to = 2. The diffusion currents for the reduction of Cd + and Zn + were found to be proportional to their concentrations. Francini et employed linear sweep voltammetry to 

On the other hand, Munday and Corbett carried out emf measurements (on the cell Ag Ag+ in NaAlCl41 glass in 

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The electronic spectra of Nbv and Tav chlorides and some reduced forms have been defined in alkali chloride and oxychloride melts.425 Nbv was detected as [NbCl6]- in the basic ionic liquid medium AlCl3-[emim]Cl (emim= l-ethyl-3-methylimidazolium).426 The addition of oxide produced [NbOCls]2-. The nature of Tav in NaCl—A1C13 melts at 175 °C was studied by potentiometry and spectrophotometry.427 For 1.1 < pCl <4.5 and 0 < [Tav] < 0.3 M, the results were consistent with the following equilibrium [TaCl6] TaCls + Cl-. Reduction led to TaIV... 

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