Characteristics of Lariat Crown Ether‐Copper (II) Ion‐Selective Electrodes

Abstract

An ion‐selective electrode using ionophore 2′‐picolyl sym‐dibenzo‐16‐crown‐5 ether as membrane carrier, sodium tetraphenylborate (NaTPB) as an anion excluder, and 2‐nitrophenyl‐octyl ether (NOPE) as the plasticing solvent mediator has been successfully developed. This electrode exhibits al in ear response with a slope of 42 mV/decade in concentration ranging from 10−5 molL−1 to 10−1 molL−1, slightly larger than the 30 mV expected from the one‐to‐one complex. The reason for the super‐Nernstain slope is the partial dimmer formation in side the membrane of the electrode, because this dimmer [Cu(C25H27NO6)2(H2O)2] 2ClO4, has been isolated and confirmed by single crystal X‐ray crystallography. The detection limit for the cop per (II) ion was estimated to be 1 × 10−6 molL−1. Electrades composed of other plasticing solvent mediators such as tris(2‐ethylhexyl) phosphate (TOP), bis (2‐ethylhexyl) sebacate (DOS) and dibutyl phthalate (DBP) were also investigated. Stability constants (logKs) of the two to one and the one to one 2‐picolylsym‐dibenzo‐16‐crown‐5 ether‐Cu (II) complexes have been determined by potentiometric titration in methanol.

Poly(vinyl) chloride membrane copper-selective electrode based on 1-phenyl-2-(2-hydroxyphenylhydrazo)butane-1,3-dione

“…Various analytical techniques have been proposed for determination of copper including spectrophotometric methods [8][9][10][11][12][13][14], atomic absorption spectrometry (AAS) [15,16], cold vapour AAS or flame AAS with electrothermal atomization [17,18], inductively coupled plasma emission spectrometry [19,20], gravimetry [21,22], chromatography [23,24], and anodic stripping voltam- 3.1 × 10 −6 5 × 10 −6 to 5 × 10 −2 5 29.8 Na + , Ni 2+ , Hg 2+ [33] 3,4,10,11-Tetraphenyl-1,2,5,8,9,12,13-octaaza-cyclotetra-deca-7,14-dithizone-2,4,9,11-tetraene 1.6 × 10 −6 1 × 10 −5 to 1 × 10 −2 2 2 7 N a + , K + , Mg 2+ , Ca 2+ , Ba 2+ , Zn 2+ , Cd 2+ , Hg 2+ , Pb 2+ , Fe 3+ , Al 3+ [34] 1,15-Diaza-3,4;12,13-dibenzo-5,8,11,18,21-pentaoxacyclotrieicosane-2,14-dione 1.2 × 10 −5 1 × 10 −5 to 1 × 10 −1 20 30.0 Na + , K + , Cs + , Sr 2+ [35] Aza-thioether crown containing a 1,10-phenanthroline 8.0 × 10 −6 1 × 10 −5 to 1 × 10 −1 15 29.4 Ag + , La 3+ [36] 2 -Picolyl sym-dibenzo-16-crown-5 ether 1.0 × 10 −6 1 × 10 −5 to 1 cost of the carrier synthesis [35,37,45,61]. In fact, the described sensors, although being prepared independently, have rather similar parameters (e.g.…”

Supramolecular Based Membrane Sensors

“…The detection limit for the copper(II) ion was estimated to be 1 × 10 -6 M. Electrodes composed of other plasticising solvent mediators such as tris(2-ethylhexyl) phosphate (TOP), his (2-ethylhexyl) sebacate (DOS) and dibutyl phthalate (DBP) were also investigated. Stability constants (log K s ) of the two to one and the one to one 2-picolyl sym-dibenzo-16-crown-5 ether-Cu (II) complexes were determined by potentiometric titration in methanol [175]. Kuckling D, Pareek P, had a paper on the synthesis of a functionalized cyclam by the attachment of a polymerizable acryloyl group to one of the four nitrogens on the cyclam molecule.…”