Summary The dioxa-dithioamide 3 behaves as a highly selective ionophore for Cd2+ in solvent polymeric membranes. It induces cation-permselectivity in these membranes with a transference number of 1 for Cd (NO,),-and of 2 for CdCl+ olutions. In the presence of a proton carrier, 3 may be used to selectively pump Cd2+ through membranes by coupling with a pH gradient.
![2-[2-(2-chloro-2-oxoethoxy)ethoxy]acetyl chloride Structure](https://image.chemsrc.com/caspic/374/31255-09-1.png)