Journal
INORGANIC CHEMISTRY
Volume 49, Issue 21, Pages 9928-9939Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic101133w
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Funding
- NM [HL69832]
- Office of Science, Office of Basic Energy Sciences
- Division of Chemical Sciences, Geosciences, and Biosciences of the U.S. Department of Energy at LBNL [DE-ACO2-05CH11231]
- German Research Foundation (DFG)
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The synthesis, stability, and photophysical properties of several Eu(III) complexes featuring the 1-hydroxypyridin-2-one (1,2-HOPO) chelate group in tetradentate and octadentate ligands are reported. These complexes pair highly efficient emission with exceptional stabilities (pEu similar to 20.7-21.8) in aqueous solution at pH 7.4. Further analysis of their solution behavior has shown the observed luminescence intensity is significantly diminished below about pH similar to 6 because of an apparent quenching mechanism involving protonation of the amine backbones. Nonetheless, under biologically relevant conditions, these complexes are promising candidates for applications in Homogeneous Time-Resolved Fluorescence (HTRF) assays and synthetic methodology to prepare derivatives with either a terminal amine or a carboxylate group suitable for bioconjugation has been developed. Lastly, we have demonstrated the use of these compounds as the energy donor in a Luminescence Resonance Energy Transfer (LRET) biological assay format.
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