Tetrathiafulvalene‐Based Podands for Pb2+ Recognition
The synthesis and design optimization of a series of new redox-reponsive ligands built around the tetrathiafulvalene electroactive core and incorporating two to four pendant polyether binding sites are described. A comparative study of the recognition properties of these podand-TTFs forlead(II) has been carried out by cyclic voltammetry. The design optimization produced a ligand (1c) that exhibits a remarkably high affinity for lead(II), as shown by electronic absorption spectroscopy, 1H NMR titration studies and cyclic voltammetry. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)