Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

The stability constants for the ML⁺ complex species, where M⁺ is an alkali metal cation and L is dibenzo-18-crown-6, in nitrobenzene saturated with water were calculated by employing published equilibrium data. The stability is found to increase in the cation order Li⁺ < Cs⁺ < Rb⁺ < K⁺ < Na⁺. For the NaL⁺, KL⁺, RbL⁺, and CsL⁺ complex cations the individual extraction constants in the water-nitrobenzene system were determined; their values increase in the series Na⁺ < K⁺ < Rb⁺ < Cs⁺.