13C‐NMR. Studies on Ion‐Selective Liquid Membranes. A method for the 13C‐NMR. study of solvent polymeric membranes in equilibrium with aqueous salt solutions is described. Neutral ion carriers incorporated in these membranes maintain a high degree of rotational mobility. The complexation by group IA and IIA cations of macrotetrolide antibiotics as well as of carriers of the type 3,6‐dioxa‐octanedioic diamides in the membrane phase was followed by 13C‐NMR. chemical shift and spin‐lattice relaxation studies.
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Büchi et al. (1976) studied this question.
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