Highly selective optical-sensing membranes, containing calix[4]arene chromoionophores, for Pb2+ ions

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Veen van der, Niels J. and Rozniecka, Ewa and Woldering, Leon A. and Chudy, Michael and Huskens, Jurriaan and Veggel van, Frank C.J.M. and Reinhoudt, David N. (2001) Highly selective optical-sensing membranes, containing calix[4]arene chromoionophores, for Pb2+ ions. Chemistry: a European Journal, 7 (22). pp. 4878-4886. ISSN 0947-6539

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Abstract:Plasticized poly(vinyl chloride) (PVC) optode membranes containing novel calix[4]arene chromoionophores 1 or 2 and one equivalent of a lipophilic anion respond to Pb2+ ions with high selectivity over alkali, alkaline-earth, and other heavy metal ions. This selectivity stems from the combination of ligand specificity and a unique ion exchange scheme that employs both monovalent metal ions and protons as the exchanged ions. Complexation of Pb2+ ions inside the membrane is accompanied by deprotonation of the chromoionophores, which causes a bathochromic shift of the absorption maximum h-max. The response to Pb2+ ions is modulated by pH and alkali metal ions in a fashion that is consistent with the proposed ion-exchange mechanism. Of all of the other metal ions tested, only Cs+ and Ag+ produce a color change. However, these monovalent metal ions cause hypsochromic shifts of h-max instead of the bathochromic shift caused by Pb2+, because the chromoionophores remain protonated upon complexation.
Item Type:Article
Copyright:© 2001 Wiley InterScience
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/36760
Official URL:http://dx.doi.org/10.1002/1521-3765(20011119)7:22<4878::AID-CHEM4878>3.0.CO;2-8
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