title: Double-armed crown ethers: synergic pi-coordination effect on potentiometric sensing for Ag(I).
abstract: Three diaza-18-crown-6 derivatives having methyl (L1), methoxy (L2) and phenyl (L3) end-groups in para-substituted phenolic side-arms have been investigated as potentiometric sensing materials for silver(I)-selective poly(vinyl chloride) membrane electrodes. The aim of the present work is to establish whether a combination of macrocyclic coordination to Ag+ ion and Ag-pi interaction might produce synergic effect in Ag+ ion sensing. The electrode based on the aromatic end-groups, L3 was found to give remarkably better electrochemical performance than their aliphatic counterparts (L1 and L2). The sensing ability for Ag+ ion with the proposed electrode was enhanced noticeably due to the pi-coordination of Ag+ ion, which was elucidated by NMR. The present findings may serve as an alternative approach for designing advanced sensing materials.
authors.affiliation: Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Chinju, S. Korea.
authors.forename: Bohyun
authors.initials: B
authors.lastname: Choi
authors.forename: Il
authors.initials: I
authors.lastname: Yoon
authors.forename: Jeong
authors.initials: J
authors.lastname: Kim
authors.forename: Jineun
authors.initials: J
authors.lastname: Kim
authors.forename: Shim Sung
authors.initials: SS
authors.lastname: Lee
authors.forename: Jae Sang
authors.initials: JS
authors.lastname: Kim