Liquid–liquid distribution of ion associates of hexabromotellurate (IV) with quaternary ammonium counter ions

Add time:08/06/2019    Source:sciencedirect.com

The distribution behavior of ion associates (Q+)2. TeBr62− of TeBr62− with quaternary ammonium cations (Q+) between aqueous phase and two organic phases (1,2-dichloroethane (DCE) and chloroform (CF)) was examined, and the extraction constants (log Kex) were determined. The extractability with long-chain alkyltrimethylammonium cations (group I) is greater than that with symmetrical tetraalkylammonium cations (group II) in the 1,2-dichloroethane extraction system and the difference in log Kex for two cations (one of each type) with the same number of carbon atoms was about 3 on the average. The contributions of a methylene group in the cations of groups I and II to log Kex were found to be 0.43∼1.10 and about 0.74 on the average. Among the ion associates examined, the extractability of the extracting solvent was in the DCE>CF; the difference in log Kex was about 5 on the average.

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