Premium
Phosphate‐Binding Characteristics and Selectivity Studies of Bifunctional Organotin Carriers
Author(s) -
Tsagkatakis Ioannis,
Chaniotakis Nikolas,
Altmann Reiner,
Jurkschat Klaus,
Willem Rudolph,
Martins José C.,
Qin Yu,
Bakker Eric
Publication year - 2001
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/1522-2675(20010711)84:7<1952::aid-hlca1952>3.0.co;2-x
Subject(s) - chemistry , bifunctional , potentiometric titration , perchlorate , selectivity , membrane , phosphate , titration , inorganic chemistry , ion , organic chemistry , catalysis , biochemistry
The selective recognition of the orthophosphate anion by a series of bifunctional Lewis acidic organotin compounds is investigated. The binding affinity of these carriers to anions, as measured by NMR titrations in CH 2 Cl 2 obeyed the potentiometric selectivity order phosphate > sulfate > perchlorate, and provided the corresponding complex‐formation constants. More accurate calculations of these values were obtained by the segmented‐sandwich‐membrane method performed directly inside the liquid polymeric membrane. These carriers were also studied potentiometrically in polymeric liquid membranes. The results indicate that (PhBr 2 Sn) 2 CH 2 is 2 to 5 orders of magnitude more selective towards phosphate over other oxoanions. These results set the ground for the development of a new series of highly selective anions carriers with a wide range of possible applications.