2787-93-1Relevant academic research and scientific papers
RECYCLING OF ORGANOTIN COMPOUNDS
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, (2013/12/03)
A method for the synthesis of a first organic molecule, said method comprising the steps of: a) Reacting a first reactant with an organotin reactant having at least one optionally substituted organic group having from 5 to 20 carbon atoms selected from alkyl, alkenyl, alkynyl, alkoxyalkyl, alkoxy, alkylthioalkyl, carboxylates and alkylaminoalkyl groups, thereby forming a mixture of a product and a tin-containing by-product, and b) Removing most of the tin-containing by-product from said mixture in such a way as to provide a purified product comprising less than 1000 ppm of remaining tin-containing by- product, wherein said step of removing most of said tin-containing by-product is either an extraction between a first liquid and a second liquid, said second liquid being more polar than said first liquid and at least partly immiscible therewith or is a reversed phase chromatography.
Anion Selectivity of Tetravalent Tin Compounds in Membranes Studied by 119Sn-, 13C- and 1H-NMR
Pham, Hung-Viet,Pretsch, Ernoe,Fluri, Karl,Bezegh, Andras,Simon, Wilhelm
, p. 1894 - 1904 (2007/10/02)
The fundamental molecular aspects of trialkyltin compounds of the type R3SnY have been investigated in view of their applicability as ion-selective components in solvent polymeric membranes.The interaction between these compounds and anions has been studied using 119Sn- and 13C-NMR.Neutral tetracoordinated trialkyltin compounds form a negatively charged pentacoordinated complex upon interaction with CI-ions in homogeneous organic phases as well as in membranes in contact with aqueous solutions.Although in a homogeneous phase, the electronegative substituent Y determines the complex-formation constant, it has no influence on the potentiometric anion selectivity in liquid membranes containing trialkyltin carriers R3SnY with different Y.The observed selectivity pattern is not given by the magnitude of the stability constants in a homogeneous phase but is dictated by the prevailing association-dissociation process leading to tetracoordinated compounds which change in constitution due to varying sample composition.The results obtained from equilibrium studies of tetravalent monotin compounds with anions in both homogeneous phase and in two-phase systems confirm the earlier hypothesis that trialkyltin compounds incorporated in solvent polymeric membranes act as electrically neutral carriers for anions.
