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

Title: Intramolecular binding site competition as a means of tuning the response of a colourimetric anion sensor
Creator: Dickson, Sara Jane; Wallace, Emma V. B.; Swinburne, Adam N.; Paterson, Martin J.; Lloyd, Gareth O.; Beeby, Andrew; Belcher, Warwick J.; Steed, Jonathan W.
Relation: New Journal of Chemistry Vol. 32, Issue 5, p. 786-789
Publisher Link: http://dx.doi.org/10.1039/b800094h
Publisher: Royal Society of Chemistry
Resource Type: journal article
Date: 2008
Description: 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.
Subject: charge-transfer; solid-state; receptors; viologens
Identifier: http://hdl.handle.net/1959.13/41395
Identifier: uon:4763
Identifier: ISSN:1144-0546
Language: eng
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