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Parker, David; Bruce, James I.; Blair, Stephanie and Lowe, Mark P.
(2001).
DOI: https://doi.org/10.1016/S0162-0134(01)00254-9
URL: http://www.sciencedirect.com/science?_ob=ArticleUR...
Abstract
Two series of lanthanide complexes have been prepared which exhibit a pronounced pH-dependence of either
luminescent emission t or of relaxivity. In a prototypical example of the luminescent europium series, the effect of
structural variation, especially axial donor exchange on the optical and NMR properties of the complex, has been
interpreted in terms of a simple ligand electrostatic perturbation model, in which the effect of the polarisability of the axial
donor predominates. Emissive Eu and Tb complexes have been incorporated into sol-gel matrices and examined in a flow
system: perturbation of the singlet or triplet excited state of the sensitising chromophore is revealed by changes in the
emission intensity ratio or in excitation spectra, pH dependent variation of the hydration state of the lanthanide ion may
also be controlled by structural perturbation of an intramolecular sulfonamide ligation process, allowing pH-dependent
relaxivity to be defined over the range 6 to 8, in human serum solution.
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