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Using the Antenna Effect as a Spectroscopic Tool: Photophysics and Solution Thermodynamics of the Model Luminescent Hydroxypyridonate Complex [Eu^III(3,4,3-LI(1,2-HOPO))]⁻

Supporting Info

Rebecca J. Abergel†, Anthony D’Al

o†, Clara Ng Pak Leung†, David K. Shuh† and Kenneth N. Raymond*†‡

^† Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

^‡ Department of Chemistry, University of California, Berkeley, California 94720-1460

Inorg. Chem., 2009, 48 (23), pp 10868–10870

DOI: 10.1021/ic9013703

Publication Date (Web): November 10, 2009

*To whom correspondence should be addressed. E-mail: raymond@socrates.berkeley.edu. Fax: (510) 486 5283.

Abstract

Although widely used in bioassays, the spectrofluorimetric method described here uses the antenna effect as a tool to probe the thermodynamic parameters of ligands that sensitize lanthanide luminescence. The Eu³⁺ coordination chemistry, solution thermodynamic stability, and photophysical properties of the spermine-based hydroxypyridonate octadentate chelator 3,4,3-LI(1,2-HOPO) are reported. The complex [Eu^III(3,4,3-LI(1,2-HOPO))]⁻ luminesces with a long lifetime (805 μs) and a quantum yield of 7.0% in aqueous solution, at pH 7.4. These remarkable optical properties were exploited to determine the high (and proton-independent) stability of the complex (log β₁₁₀ = 20.2(2)) and to define the influence of the ligand scaffold on the stability and photophysical properties.

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History

Published In Issue December 07, 2009
Article ASAPNovember 10, 2009
Received: July 13, 2009

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Communication

Using the Antenna Effect as a Spectroscopic Tool: Photophysics and Solution Thermodynamics of the Model Luminescent Hydroxypyridonate Complex [Eu^III(3,4,3-LI(1,2-HOPO))]⁻