Abstract
AbstractProton affinity of various “crown” ethers is discussed. Equations are given for simultaneous calculation of the complexation and the dissociation constants from conductivity data. pKf in 1.2‐dichloroethane is 8.6 and 8.3, respectively, for the cis‐syn‐cis and the cis‐anti‐cis isomers of dicyclohexyl‐18‐CR‐6, the most basic among the investigated “crown” ethers. pKf = 8.2 for the mixture of these isomers in acetonitrile (AN). The effect of water on pKf of “crown” ethers in aprotic solvents is discussed. It is suggested that a monohydrate of the “oxonium‐crown” rather than a “hydronium‐crown” may be formed. The proton binding capacity of “crown” ethers may be applied for extraction of acids and in catalysis. Dicyclohexyl‐24‐CR‐8 has been found to be an equally effective extractant for HNO3 as the Dicyclohexyl‐18‐CR‐6.
Published Version
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