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Issue 5, 2008
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Intramolecular binding site competition as a means of tuning the response of a colourimetric anion sensor

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Abstract

Two new viologen-based anion hosts, 2 and 3, are reported, incorporating two tripodal binding domains. Binding of carboxylate anions, particularly acetate, malonate and succinate by pyridinium derivative 2 results in an intense purple colouration. DFT calculations on representative system 2·malonate reveal that this absorption arises from charge-transfer from the anion to the bipyridinium unit. Anion binding by 3 does not initially result in a colour change because anions are bound at the periphery of the receptor; however, addition of more that two equivalents of acetate or more than one equivalent of dicarboxylate turn the colourimetric response on.

Graphical abstract: Intramolecular binding site competition as a means of tuning the response of a colourimetric anion sensor

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Publication details

The article was received on 07 Jan 2008, accepted on 23 Jan 2008 and first published on 01 Feb 2008


Article type: Letter
DOI: 10.1039/B800094H
Citation: New J. Chem., 2008,32, 786-789
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    Intramolecular binding site competition as a means of tuning the response of a colourimetric anion sensor

    S. J. Dickson, E. V. B. Wallace, A. N. Swinburne, M. J. Paterson, G. O. Lloyd, A. Beeby, W. J. Belcher and J. W. Steed, New J. Chem., 2008, 32, 786
    DOI: 10.1039/B800094H

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