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Lookup NU author(s): Professor Andrew Benniston,
Emeritus Professor Anthony Harriman,
Dr Karen Rafferty
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A fluorescent sensor has been synthesized that comprises a pyrene moiety tethered to a [2,2′:6′,2″]-terpyridyl ligand via a diethynylated thiophene linker. This multicomponent supermolecule is highly emissive in solution but addition of Zn2+ cations results in a drastic decrease in the fluorescence yield. Complexation between Zn2+ cations and the vacant terpyridyl ligand has been confirmed by NMR spectroscopy and by electrospray mass spectrometry. The ES-MS results provide strong support for the formation of both 1:1 and 1:2 (metal:ligand) complexes in solution. Complexation is further evidenced by a pronounced shift in the absorption spectrum, by the appearance of a long-wavelength band in the fluorescence spectrum and by cyclic voltammetry. On the basis of UV-visible spectrophotometric titrations, overall binding constants of logβ1 ≈ 5.1 and logβ2 ≈ 9.9 were derived for the 1:1 and 1:2 complexes, respectively, in acetonitrile solution. The possible application of this system as a generic chemical sensor for cationic species is mentioned.
Author(s): Benniston AC, Harriman A, Lawrie DJ, Mayeux A, Rafferty K, Russell OD
Publication type: Article
Publication status: Published
Journal: Dalton Transactions
ISSN (print): 1477-9226
ISSN (electronic): 1477-9234
Publisher: Royal Society of Chemistry
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