6533b82cfe1ef96bd128f4f0
RESEARCH PRODUCT
Sequestration of alkyltin(IV) cations by complexation with amino-polycarboxylic chelating agents
Alberto PettignanoConcetta De StefanoAntonio GianguzzaSalvatore CataldoSilvio Sammartanosubject
Aqueous solutionComplexation in aqueous solutionStereochemistryLigandEthylenediamineProtonationAlkyltin(IV) cations; Amino-polycarboxylic ligands; Complexation in aqueous solution; Sequestration ability of complexones;Condensed Matter PhysicsMedicinal chemistryAtomic and Molecular Physics and OpticsAlkyltin(IV) cationElectronic Optical and Magnetic MaterialsIonAmino-polycarboxylic ligandchemistry.chemical_compoundSequestration ability of complexoneschemistryDiethylenetriamineMaterials ChemistryChelationSettore CHIM/01 - Chimica AnaliticaPhysical and Theoretical ChemistrySimple correlationSpectroscopydescription
Abstract The binding capacity of four amino-polycarboxylic ligands (APCs) [nitrilotriacetate (NTA), ethylenediamine- N , N , N′ , N′ -tetraacetate (EDTA), (S,S)-ethylenediamine- N , N ′-disuccinic acid (S,S-EDDS) and diethylenetriamine- N , N , N′ , N″ , N″ -pentaacetate (DTPA)] towards mono-, di- and tri-alkyltin(IV) cations [(CH 3 )Sn 3 + , (CH 3 ) 2 Sn 2 + , (C 2 H 5 ) 2 Sn 2 + , (CH 3 ) 3 Sn + or (C 2 H 5 ) 3 Sn + ] was studied, in aqueous solutions, by ISE-H + potentiometry, at I = 0.1 mol L − 1 (NaCl) and at T = 298.15 K. In all the systems R x Sn (4 − x)+ − APC (R = CH 3 or C 2 H 5 ) a strong 1:1 species is formed together with protonated, hydroxo and dinuclear complexes. The values of log K are roughly linearly dependent on the charge of both the cation and the anion, and the very simple correlation log K = (1.50 ± 0.05) z anion · z cation can account for the stability of all the complexes, but hydroxo species, formed in the experimental conditions used in this investigation. The sequestering ability of APCs in each system was evaluated, at different pH values, by using the parameter pL 0.5 , i.e., the total ligand concentration necessary to bind 50% of alkyltin(IV) cation trace.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-11-01 |