Toggle Main Menu Toggle Search

Open Access padlockePrints

A general purpose reporter for cations: Absorption, fluorescence and electrochemical sensing of zinc(II)

Lookup NU author(s): Professor Andrew Benniston, Emeritus Professor Anthony Harriman, Donald Lawrie, Annabelle Mayeux, Dr Karen Rafferty


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


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.

Publication metadata

Author(s): Benniston AC, Harriman A, Lawrie DJ, Mayeux A, Rafferty K, Russell OD

Publication type: Article

Publication status: Published

Journal: Dalton Transactions

Year: 2003

Issue: 24

Pages: 4762-4769

ISSN (print): 1477-9226

ISSN (electronic): 1477-9234

Publisher: Royal Society of Chemistry


DOI: 10.1039/b313413j


Altmetrics provided by Altmetric