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Issue 3, 2013
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Lanthanide hexafluoroacetylacetonates vs. nitrates for the controlled loading of luminescent polynuclear single-stranded oligomers

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Abstract

This work demonstrates how minor structural and electronic changes between Ln(NO3)3 and Ln(hfac)3 lanthanide carriers (Ln = trivalent lanthanide, hfac = hexafluoroacetylacetonate) lead to opposite thermodynamic protocols for the metal loading of luminescent polynuclear single-stranded oligomers. Whereas metal clustering is relevant for Ln(hfac)3, the successive fixation of Ln(NO3)3 provides stable microspecies with an alternated occupancy of the binding sites. Partial anion dissociation and anion/ligand bi-exchange processes occur in polar aprotic solvents, which contribute to delay the unambiguous choice of a well-behaved neutral lanthanide carrier for the selective complexation of different trivalent lanthanides along a single ligand strand. Clues for further improvement along this stepwise strategy are discussed.

Graphical abstract: Lanthanide hexafluoroacetylacetonates vs. nitrates for the controlled loading of luminescent polynuclear single-stranded oligomers

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Article information


Submitted
14 Nov 2012
Accepted
10 Dec 2012
First published
07 Jan 2013

Chem. Sci., 2013,4, 1125-1136
Article type
Edge Article

Lanthanide hexafluoroacetylacetonates vs. nitrates for the controlled loading of luminescent polynuclear single-stranded oligomers

A. Zaïm, N. D. Favera, L. Guénée, H. Nozary, T. N. Y. Hoang, S. V. Eliseeva, S. Petoud and C. Piguet, Chem. Sci., 2013, 4, 1125
DOI: 10.1039/C2SC21982D

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