Anion Selectivities of Dibutyltin Dihalides as Neutral Carriers for Ion-Selective Electrodes

Abstract

Various organotin compounds have been investigated as neutral carriers for anion selective electrodes 1-18 because they are attractive candidates for anion sensors with a selectivity sequence deviating from the one observed with classical anionexchanger membranes, [19][20][21][22] namely Hofmeister lyotropic anion selectivity sequence.

Perchlorate-selective polymeric membrane electrode based on bis(dibenzoylmethanato)cobalt(II) complex as a neutral carrier

“…In the case of organometallic compounds [46] and metalloporphyrin derivatives [31,35,43,44], the anion selectivity is mainly governed by a specific interaction between the central metals and the anions rather than the lipophilicity of the anions or a simple opposite charge interaction with anions [47]. The preferential response of the ionophore used towards ClO 4 − is believed to be associated with the coordination of perchlorate to the metal center in the complex bis(dibenzoylmethanato)cobalt(II), and it is the relative affinity of the ClO 4 − as a suitable ligand for Co(II) that dictates the observed selectivity pattern of the electrodes.…”

Perchlorate-selective polymeric membrane electrode based on a cobaloxime as a suitable carrier

“…These include the amount of ionophore, the nature of solvent mediator, the plasticizer/PVC ratio and, especially, the nature of additives used [32][33][34][35][36][37][38][39][40][41]. Thus, different aspects of membrane preparation based on the [Co(dmgH) 2 pph 3 Cl] for ClO 4 − ion were optimized and the results are summarized in Table 1.…”

Ion‐Selective Electrodes for Thiocyanate Based on the Dinuclear Zinc(II) Complex of a Bis‐N,O‐bidentate Schiff Base

“…Interestingly, the zinc(II) center provides for a somewhat unusual selectivity pattern as compared to ISEs based on other metalloorganic ionophores. For [36,37]) and a zinc(II) tetraphenylporphyrin (log K pot SCN;NO3 (SSM) À 2.4, as calculated from reported log K pot I;j [8]). Since the above selectivity data suggested the possibility of one thiocyanate interacting with both zinc(II) centers of the dinuclear ionophore complex, we were interested in seeing the selectivity of this electrode for organic cations with two distinct coordinating groups.…”