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Ion-selective langmuir blodgett films of a chromoionophore

Authors

  • Igor K. Lednev,

    1. Molecular Electronics Research Group, School of Engineering, University of Durham, Durham DH1 3LE, U.K.
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    • Department of Photochemistry, Institute of Chemical Physics, Russian Academy of Sciences, Chemogolovka, Moscow Region, 142432, Russia.

  • Michael C. Petty

    1. Molecular Electronics Research Group, School of Engineering, University of Durham, Durham DH1 3LE, U.K.
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Abstract

Langmuir–Blodgett films built up from an amphiphilic derivative of benzothiazolium styryl dye containing a 1,10-dithia-18-crown-6 ether group have been found to complex with ‘soft’ polarisable ions such as Ag+ and Hg2+ in water. The films exhibited high sensitivity (stability constant of complex formation K ≈ 105 M−1) and high selectivity (e.g. K(Ag+)/K(Pb2+)> 105) compared with aqueous solutions of similar ionophores. This was attributed to the predominant formation of complexes with ligand–cation stoichiometries of 2:1 in the films.

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