Fluorescent photoinduced electron transfer (PET) sensors for anions; from design to potential application

Gunnlaugsson, Thorfinnur, Ali, Haslin Dato Paduka, Glynn, Mark, Kruger, Paul, Hussey, Gillian, Pfeffer, Frederick, dos Santos, Cid´alia. and Tierney, Juliann 2005, Fluorescent photoinduced electron transfer (PET) sensors for anions; from design to potential application, Journal of fluorescence, vol. 15, no. 3, pp. 287-299.

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Title Fluorescent photoinduced electron transfer (PET) sensors for anions; from design to potential application
Author(s) Gunnlaugsson, Thorfinnur
Ali, Haslin Dato Paduka
Glynn, Mark
Kruger, Paul
Hussey, Gillian
Pfeffer, Frederick
dos Santos, Cid´alia.
Tierney, Juliann
Journal name Journal of fluorescence
Volume number 15
Issue number 3
Start page 287
End page 299
Publisher Springer
Place of publication Dordrecht, The Netherlands
Publication date 2005-05
ISSN 1053-0509
1573-4994
Keyword(s) anions
sensing
chemosensors
fluorescence
acetate
phosphate
halides
fluoride
PET
Summary This mini review highlights the synthesis and photophysical evaluation of anion sensors, for nonaqueous solutions, that have been developed in our laboratories over the last few years. We have focused our research mainly on developing fluorescent photoinduced electron transfer (PET) sensors based on the fluorophore-spacer-anion receptor principle using several anthracene (emitting in the blue) and 1,8-naphthalimide (emitting in the green) fluorophores, with the aim of targeting biologically and industrially relevant anions such as acetates, phosphate and amino acids, as well as halides such as fluoride. The receptors and the fluorophore are separated by a short methyl or ethyl spacer, where the charge neutral anion receptors are either aliphatic or aromatic urea (or thiourea) moieties. For these, the anion recognition is through hydrogen bonding, yielding anion:receptor complexes. Such bonding gives rise to enhanced reduction potential in the receptor moieties which causes enhancement in the rate of PET quenching of the fluorophore excited state from the anion:receptor moiety. This design can be further elaborated on by incorporating either two fluorophores, or urea/thiourea receptors into the sensor structures, using anthracene as a fluorophore. For the latter design, the sensors were designed to achieve sensing of bis-anions, such as di-carboxylates or pyrophosphate, where the anion bridged the anthracene moiety. In the case of the naphthalimide based mono-receptor based PET sensors, it was discovered that in DMSO the sensors were also susceptible to deprotonation by anions such as F− at high concentrations. This led to substantial changes in the absorption spectra of these sensors, where the solution changed colour from yellow/green to deep blue, which was clearly visible to the naked eye. Hence, some of the examples presented can act as dual fluorescent-colorimetric sensors for anions. Further investigations into this phenomenon led to the development of simple colorimetric sensors for fluorides, which upon exposure to air, were shown to fix carbon dioxide as bicarbonate.
Notes Online Wednesday, June 29, 2005
Language eng
Field of Research 030107 Sensor Technology (Chemical aspects)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2005, Springer Science+Business Media, Inc
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008872

Document type: Journal Article
Collection: School of Biological and Chemical Sciences
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