Issue 5, 2008

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

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

Supplementary files

Article information

Article type
Letter
Submitted
07 Jan 2008
Accepted
23 Jan 2008
First published
01 Feb 2008

New J. Chem., 2008,32, 786-789

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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