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The formation constants (Kf) for the 1 : 1 complexes of dibenzo-18-crown-6 (DBG) with alkali metal ions in DMSO (dimethyl sulfoxide), DMF (N,N-dimethyl formamide), and PC (propylene carbonate) have been determined conductometrically. The formation constant sequences of the alkali metal ions with DBG in DMSO, DMF, and PC are K+>Rb+>Cs+≅Na+>>Li+, K+>Rb+>Cs+>Na+>Li+, and K+>>Na+>Rb+>Cs+>Li+ respectively. The Kf value series about the same alkali metal ion among these nonaqueous solvents are given in the order of DMSO
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Matsuura et al. (1976) studied this question.
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