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A [Cyclentetrakis(methylene)]tetrakis[2-hydroxybenzamide] Ligand That Complexes and Sensitizes Lanthanide(III) Ions by Anthony D'Aléo; Jide Xu; King Do; Gilles Muller; Kenneth N. Raymond is a Chemistry article available to read on EtoBox.

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## Abstract The synthesis of the cyclen derivative H~4~**L**^**1**^⋅2 HBr containing four 2‐hydroxybenzamide groups is described. The spectroscopic properties of the Ln^III^ conplexes of **L**^**1**^ (Ln=Gd, Tb, Yb, and Eu) reveal changes of the UV/VIS‐absorption, circular‐dichroism‐absorption, luminescence, and circularly polarized luminescence spectra. It is shown that at least two metal‐complex species are present in solution, whose relative amounts are pH dependent. At pH>8.0, an intense long‐lived emission is observed (for [Tb**L**^**1**^] and [Yb**L**^**1**^]), while at pH<8.0, a weaker, shorter‐lived species predominates. Unconventional Ln^III^ emitters (Pr, Nd, Sm, Dy, and Tm) were sensitized in basic solution, both in the VIS and in the near‐IR, to measure the emission of these ions.

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Author

Anthony D'Aléo; Jide Xu; King Do; Gilles Muller; Kenneth N. Raymond

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley-Blackwell; Wiley (ISSN 0018-019X)

Published

2009

Language

EN

Field

Chemistry (Physical Sciences)