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Issue 24, 2016
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Intramolecular sensitization of americium luminescence in solution: shining light on short-lived forbidden 5f transitions

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Abstract

The photophysical properties and solution thermodynamics of water soluble trivalent americium (AmIII) complexes formed with multidentate chromophore-bearing ligands, 3,4,3-LI(1,2-HOPO), Enterobactin, and 5-LIO(Me-3,2-HOPO), were investigated. The three chelators were shown to act as antenna chromophores for AmIII, generating sensitized luminescence emission from the metal upon complexation, with very short lifetimes ranging from 33 to 42 ns and low luminescence quantum yields (10−3 to 10−2%), characteristic of Near Infra-Red emitters in similar systems. The specific emission peak of AmIII assigned to the 5D17F1 f–f transition was exploited to characterize the high proton-independent stability of the complex formed with the most efficient sensitizer 3,4,3-LI(1,2-HOPO), with a log β110 = 20.4 ± 0.2 value. In addition, the optical and solution thermodynamic features of these AmIII complexes, combined with density functional theory calculations, were used to probe the influence of electronic structure on coordination properties across the f-element series and to gain insight into ligand field effects.

Graphical abstract: Intramolecular sensitization of americium luminescence in solution: shining light on short-lived forbidden 5f transitions

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Supplementary files

Article information


Submitted
22 Jan 2016
Accepted
25 Feb 2016
First published
10 Mar 2016

Dalton Trans., 2016,45, 9912-9919
Article type
Paper

Intramolecular sensitization of americium luminescence in solution: shining light on short-lived forbidden 5f transitions

M. Sturzbecher-Hoehne, P. Yang, A. D'Aléo and R. J. Abergel, Dalton Trans., 2016, 45, 9912
DOI: 10.1039/C6DT00328A

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