Add time:09/04/2019         Source:sciencedirect.com

The distributions of lithium cation, picrate anion and dibenzo-14-crown-4 (DB14C4) and its analogs between water and various solvents, as well as the formation of ion pairs of lithium picrate (cas 18390-55-1) and crown in these solvents, were studied spectrophotometrically at 24 ± 1 °C. The solvents used included benzene, chloroform, dichloromethane, 1,2-dichloroethane, nitromethane, and nitrobenzene. A 1:1 complex cation was formed between Li+ and crown among these solvents. Three different kinds of ion pairs of Li+-crown complex cation and picrate anion could be determined from a series of absorption maximum shifts. The effects of substituent groups on DB14C4 and solvents upon the extraction constant are presented. A plausible extraction mechanism is also suggested.

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