- 作者: Characteristics of Lariat Crown Ether-Copper(II) Ion-Selective Electrodes
- 中文摘要:
Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan 116, R.O.C.
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 a linear 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 inside 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 copper(II) ion was estimated to be 1 ’ 10-6 molL-1. Electrodes 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-picolyl sym-dibenzo-16-crown-5 ether-Cu (II) complexes have been determined by potentiometric titration in methanol. - 英文摘要: --
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