title: Investigation of ion transfer across the micro-water/nitrobenzene interface facilitated by a fullerene derivative.
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.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy Sciences.
authors.forename: Bin
authors.initials: B
authors.lastname: Su
authors.forename: Sheng
authors.initials: S
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Yuan
authors.forename: Jidong
authors.initials: J
authors.lastname: Guo
authors.forename: Liangbing
authors.initials: L
authors.lastname: Gan
authors.forename: Yuanhua
authors.initials: Y
authors.lastname: Shao