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AssigneeCeskoslovenska akademie ved
InventorsJaroslav Petranek, Olen Ryba, Miloslav Semler, Miroslav Panoch
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Polymeric membrane selective to calcium (II) ions. The invention relates to a polymeric membrane selective to calcium (II) ions, formed by a solid film of plastic material, advantageously of poly(vinyl chloride), which contains an active neutral carrier in a plasticizer of the used plastic material. The active carrier is a complex of macrocyclic polyetherdiamides of the general formula ##STR1## where R.sub.1, R.sub.2, R.sub.3, R.sub.4 are H or alkyl containing 1 to 4 carbon atoms, advantageously methyl, R.sub.5 and R.sub.6 mean alkyl or arylalkyl with 6 to 10 carbon atoms, advantageously benzyl, with the calcium (II) ions and a lipophilic organic anion, advantageously with tetraphenylborate or tetra(p-chlorophenyl)borate anion.
A membrane selective to calcium (II) ions, formed by a solid film of plastic material which contains an active neutral carrier in a plasticizer for the plastic material, wherein the active carrier is a ternary complex of (a) a macrocyclic polyetherdiamide of the general formula ##STR3## where R.sub.1, R.sub.2, R.sub.3, R.sub.4 are H or alkyl containing 1 to 4 carbon atoms, R.sub.5 and R.sub.6 are alkyl or arylalkyl with 6 to 10 carbon atoms with (b) the calcium (II) ion and (c) a lipophilic organic anion, while the general formula of the ternary complex is
Dependencies are inferred from the claim text.