title: Development of a fluorescent optode membrane for sodium ion based on the calix[4]arene and tetraphenylporphine.
abstract: A fluorescent optode membrane for sodium ion that works on the basis of a cation-exchange mechanism has been developed. The plasticized poly(vinyl chloride) (PVC) membrane incorporating sodium-selective ionophore (4-tert-butylcalix[4]arene tetraacetic acid tetraethyl ester), acidic fluorescent pH indicator (5,10,15,20-tetraphenylporphine, TPP) and a lipophilic anionic site (potassium tetrakis(4-chlorophenyl)borate) was used as the sensing device, which exhibits the theoretically expected fluorescent response to sodium ion. The selectivity, response time, reproducibility and lifetime of the optode membrane were discussed.
authors.affiliation: College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P.R. China.
authors.forename: X
authors.initials: X
authors.lastname: Yang
authors.forename: K
authors.initials: K
authors.lastname: Wang
authors.forename: D
authors.initials: D
authors.lastname: Xiao
authors.forename: C
authors.initials: C
authors.lastname: Guo
authors.forename: Y
authors.initials: Y
authors.lastname: Xu