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Narrow-range optical pH sensors based on luminescent europium and terbium complexes immobilized in a sol gel glass

Blair, S.; Lowe, M.P.; Mathieu, C.E.; Parker, D.; Senanayake, P.K.; Kataky, R.

Authors

S. Blair

M.P. Lowe

C.E. Mathieu

P.K. Senanayake



Abstract

The metal-based emission of a series of luminescent europium and terbium complexes incorporating an aromatic chromophore is rendered pH-dependent either through perturbation of the aryl singlet or triplet energy or by modulating the degree of quenching of the lanthanide excited state. Systems exhibiting each of these pathways have been incorporated in thin-film sot gel matrixes and evaluated as pH sensors in static and flow analyses at constant ionic strength. pH-dependent intensity or ratiometric methods, for emission or excitation spectra, have been defined for lanthanide complexes incorporating substituted phenanthridine (pK(a)* from ca. 6.8 to 7.2) or 6- cyanophenanthridine-2-sulfonyl chromophores (pK(a) similar to 7.14 in human serum solution) (lambda (exc) 365 nm, phiH(2)O = 7.2%).

Citation

Blair, S., Lowe, M., Mathieu, C., Parker, D., Senanayake, P., & Kataky, R. (2001). Narrow-range optical pH sensors based on luminescent europium and terbium complexes immobilized in a sol gel glass. Inorganic Chemistry, 40(23), 5860-5867

Journal Article Type Article
Publication Date 2001-11
Journal Inorganic Chemistry
Print ISSN 0020-1669
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 40
Issue 23
Pages 5860-5867
Public URL https://durham-repository.worktribe.com/output/1556344
Publisher URL <Go to ISI>://000171932500020