Abstract
Pt(II) 5,10,15,20-tetra(4-methoxy-phenyl)-porphyrin (PtTMeOPP) was used in the construction of new ion-selective sensors. The potentiometric response characteristics (slope and selectivity) of iodide and bromide-selective electrodes based on (PtTMeOPP) metalloporphyrin in o-nitrophenyloctylether (NPOE), dioctylphtalate (DOP) and dioctylsebacate (DOS) plasticized poly(vinyl chloride) membranes are compared. The best results were obtained for the membranes plasticized with DOP and NPOE. The sensors have linear responses with near-Nernstian slopes toward bromide and iodide ions and good selectivity. The membrane plasticized with NPOE was electrochemically characterized using the EIS method to determine its water absorption and the diffusion coefficient into the membrane.
Highlights
IntroductionPorphyrins and their derivatives have versatile physicochemical properties and structural features affording functionalization that highly recommend them as sensitive compounds for sensors design [1]
Porphyrins and their derivatives have versatile physicochemical properties and structural features affording functionalization that highly recommend them as sensitive compounds for sensors design [1].Porphyrins can recognize both positive and negative ions and neutral molecules [2] being used for testing of biologically active substances, environmental pollutants, heavy metal ions [3] and explosives [4,5]
Free base porphyrins perform as neutral carriers when incorporated into polymeric membranes and can detect the metallic cations by generating sitting-a-top complexes [9]
Summary
Porphyrins and their derivatives have versatile physicochemical properties and structural features affording functionalization that highly recommend them as sensitive compounds for sensors design [1]. Porphyrins can recognize both positive and negative ions and neutral molecules [2] being used for testing of biologically active substances, environmental pollutants, heavy metal ions [3] and explosives [4,5]. Potentiometric ion selective membrane electrodes [7] based on porphyrins [8] offer many advantages amongst which are: good selectivity and sensitivity, user-friendliness, lack of toxicity. Metalloporphyrins act by selective axial coordination and can recognize and quantify several types of anions [10] and the anion selectivity can be enhanced by changing either the central metal ion or the peripheral substitution of the macrocycle [11]
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