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Issue 10, 2013
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Ln2M complexes (M = Ru, Re) derived from a bismacrocyclic ligand containing a 4,4′-dimethyl-2,2′-bipyridyl bridging unit

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Abstract

Homodinuclear lanthanide complexes derived from a ligand featuring two DO3A chelating sites linked by a 4,4′-dimethyl-2,2′-bipyridyl spacer were prepared and characterized. The bipyridyl coordination site of 1 was used to introduce Ru(Bpy)2 and Re(CO)3Cl moieties, leading to the formation of heterometallic d–f2 complexes with general formulae [Ln2·1·Ru(Bpy)2]2+ (Ln = Nd, Eu, Tb, Yb and Lu) and [Ln2·1·Re(CO)3Cl] (Ln = Nd, Yb and Lu). The luminescence properties of the complexes were investigated by means of absorption spectroscopy and steady-state and time-resolved luminescence spectroscopy covering the visible and NIR regions. Both Ru and Re chromophores were shown to act as efficient sensitizers of the NIR emission of Yb and Nd in aqueous solutions. We also consider the unsaturated coordination spheres of the Ln cations in the Ln2·1 complexes, which form ternary complexes with bidentate anions without showing particular synergistic effects for polyanionic species.

Graphical abstract: Ln2M complexes (M = Ru, Re) derived from a bismacrocyclic ligand containing a 4,4′-dimethyl-2,2′-bipyridyl bridging unit

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Publication details

The article was received on 06 Nov 2012, accepted on 07 Dec 2012 and first published on 07 Dec 2012


Article type: Paper
DOI: 10.1039/C2DT32660D
Citation: Dalton Trans., 2013,42, 3667-3681
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    Ln2M complexes (M = Ru, Re) derived from a bismacrocyclic ligand containing a 4,4′-dimethyl-2,2′-bipyridyl bridging unit

    L. J. Charbonnière, S. Faulkner, C. Platas-Iglesias, M. Regueiro-Figueroa, A. Nonat, T. Rodríguez-Blas, A. de Blas, W. S. Perry and M. Tropiano, Dalton Trans., 2013, 42, 3667
    DOI: 10.1039/C2DT32660D

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