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Cooperative anion binding and electrochemical sensing by modular podands

2002; National Academy of Sciences; Volume: 99; Issue: 8 Linguagem: Inglês

10.1073/pnas.082633299

1091-6490

L.O. Abouderbala, Warwick J. Belcher, Martyn G. Boutelle, Peter J. Cragg, Jonathan W. Steed, David R. Turner, Karl J. Wallace,

Conducting polymers and applications

A series of podands based on two or three hydrogen bonding “arms” situated in mutually ortho , meta , or para relationships about an aryl core have been prepared, and their affinities for simple inorganic anions were measured. Of the two-arm hosts the meta compound and to a lesser extent the ortho host exhibit a cooperative anion binding effect. The two arms function essentially independently in the para derivative. The mutually meta three-arm host shows dramatically enhanced cooperative binding. Conformational changes within the meta two-arm host result in significantly enhanced electrochemical anion sensing compared with the more conformationally rigid three-arm host.