title: Immobilization of ionophore and surface characterization studies of the titanium(III) ion in a PVC-membrane sensor.
abstract: Novel ionophores comprising various hydroxide and amine structures were immobilized onto poly(vinyl chloride) (PVC) matrices, and these were examined to determine Ti(III) selectivity. To predict the selectivity of Ti(III), a PVC membrane was used to investigate the binding of Ti(III) to c-methylcalix[4]resorcinarene (CMCR). The study showed that the chelating ligand, CMCR, was coordinated selectively to Ti(III) at eight coordination sites involving the oxygen atoms at the interface of the membrane/solution. The membrane was prepared, based on CMCR as an ionophore, sodium tetrakis(4-fluorophenyl) borate (NaTFPB) as a lipophilic ionic additive, and dioctylphthalate (DOP) as a plasticizer. The immobilization of the ionophore and surface characterization studies revealed that the performance of CMCR-immobilized PVC was equivalent to that of mobile ionophores in supported liquid membranes (SLMs). The strengths of the ion-ionophore (CMCR-Ti(OH)(OH(2))(5) (2+)) interactions and the role of ionophores on membranes were studied via UV-Vis, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and and X-ray diffraction (XRD).
authors.affiliation: School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia. chem_rezayi@yahoo.com
authors.forename: Majid
authors.initials: M
authors.lastname: Rezayi
authors.forename: Lee Yook
authors.initials: LY
authors.lastname: Heng
authors.forename: Anuar
authors.initials: A
authors.lastname: Kassim
authors.forename: Saeid
authors.initials: S
authors.lastname: Ahmadzadeh
authors.forename: Yadollah
authors.initials: Y
authors.lastname: Abdollahi
authors.forename: Hossein
authors.initials: H
authors.lastname: Jahangirian