| Popis: |
Porphyrins and related compounds (metalloporphyrins, phthalocyanines, etc.), owing to their unique complexing properties, are used ever more frequently as membrane-active components in membranes of ion-selective electrodes. The work examines electrochemical properties of membranes containing tetraphenylporphyrins (TPP) of metals of group IIIB of the periodic table (Al, Ga, In, Tl) and solvents-plasticizers of various nature, specifically, esters of phthalic, adipic, and sebacic acids and orthonitrophenyloctyl ether. The nature of the central atom of the metal determines the character of dependence of E on pH of solutions under study; it also defines the decrease in the slope of the SCN– function occurring in the series AlTPP → TlTPP and the change in the function sign for membranes containing TlTPP. For all the membranes, the selectivity sequences are determined by the method of individual solutions. The variation in Ksel in the series Al → Tl conforms to the other derived characteristics. |
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