Investigation of ion transfer across the micro-water/nitrobenzene interface facilitated by a fullerene derivative

Bin Su; Sheng Zhang; Yi Yuan; Jidong Guo; Liangbing Gan; Yuanhua Shao

doi:10.1021/ac0155658

Investigation of ion transfer across the micro-water/nitrobenzene interface facilitated by a fullerene derivative

Anal Chem. 2002 Jan 15;74(2):373-8. doi: 10.1021/ac0155658.

Authors

Bin Su¹, Sheng Zhang, Yi Yuan, Jidong Guo, Liangbing Gan, Yuanhua Shao

Affiliation

¹ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy Sciences.

PMID: 11811411
DOI: 10.1021/ac0155658

Abstract

A functionalized fullerene derivative containing a monoaza-18-crown-6 moiety was investigated by facilitated ion (such as Li+, Na+, K+, NH4+, Mg2+, and Ca2+) transfer across the micro-water/nitrobenzene interface supported at the tip of a micropipet. The current responses were detected by cyclic voltammetry and Osteryoung square wave voltammetry, which demonstrated that the facilitated ion transfer does occur by an interfacial complexation-dissociation process. The diffusion coefficient of this compound in nitrobenzene was approximately (5.90 +/- 0.04) x 10(-7) cm2 s(-1), which is 1 order of magnitude less than other common ionophores due to the large size of the molecule. The selectivity of this molecule toward the metal ions followed the sequence Na+ > Li+ > K+ > NH4+ > Ca2+ approximately equals Mg2+. In addition, this compound was also easy to form film at the water/nitrobenzene interface to inhibit the simple ion transfer of tetramethylammonium ion. However, the adsorption of this ionophore has less influence on the facilitated metal ion transfer.