Zur Anionenselektivität von Distannylderivaten in Membranen

Abstract

A series of distannyl derivatives (2,2-bis(trimethylstannyl)-1,3-dithiane, 2,2-bis(tributylstannyl)-l,3-dithiane, hexamethyldistannane, hexabutyldistannane, hexaphenyldistannane, bis(triphenylstannyl)sulfide, o-bis(trime-thylstanny1)benzene) has been studied in view of their applicability as anion-selective ionophores in solvent polymeric membranes. None of these compounds induces significant changes in the anion-selectivity pattern as compared with the membranes containing no organotin compound. Representatives with tributylstdnnyl groups, however, undergo chemical reactions leading to highly active anion ionophores of the type Bu,SnX, several of which (e.g. Bu,SnCI and Bu,SnOH) may be present in equilibrium in the membrane phase depending on the measuring conditions.

Anion Selectivities of Triorganyltin Acetates and Halides in Solvent Polymeric Membranes

“…-Certain organotin compounds induce anion selectivity in membranes [l-61 and act as electrically neutral carriers for anions [4] [6] (see also [7]). They are attractive candidates for anion sensors with a selectivity sequence deviating from the one observed with classical anion-exchanger membranes [5] [6] (Hofmeister lyotropic anion selectivity sequence: …”

Anion Selectivity of Tetravalent Tin Compounds in Membranes Studied by 119Sn‐, 13C‐ and 1H‐NMR

“…The two modes of action correspond to electrically charged and electrically neutral carrier mechanisms, respectively [4] [6] [S] [9]. All these trialkyltin compounds, when studied in membranes, induce a selectivity sequence deviating from that observed with classical anion-exchanger membranes [5] [I 11). This behavior supports the assumption of a selective interaction of anions with the trialkyltin compounds in the membrane phase and is, therefore, consistent with a neutralcarrier anion-transport mechanism [4].…”

Ruthenium(III) Schiff's Base Complex as Novel Chloride Selective Membrane Sensor

“…Recently, electrodes using plasticized poly(vinyl chloride) (PVC) membranes doped with organometallic species and metal-ligand and complexes, including organotin species [1], organomercury [2], derivatives of vitamin B 12 [3], Mn(IV) [4], Co(III) [5], Sn(IV) [6] and Mo(V) [7] porphyrin complexes, Co(II) phthalocyanine derivatives [8] and Schiff , s base complexes [9,10] have demonstrated potentiometric anion-selectivity sequences which are remarkably different from the Hofmetster pattern. These deviations are caused by the direct interaction between the central metal of the membrane, active components and analyte anion and steric effect associated with the structure of the ligand.…”