Lanthanide(III) coordination compounds have been recognized as promising probes and materials in a variety of practical applications from materials science to biology due to their ability to exhibit sharp characteristic transitions throughout visible and near-infrared (NIR) ranges. A major synthetic challenge to design highly luminescent Ln(III)-based compounds is to find a combination of a protective structure minimizing nonradiative deactivations and a universal chromophore with large absorbances able to efficiently sensitize the whole series of Ln(III) ions. Two series of heterometallic metallacrowns LnGa4, LnIII[12-MCGaIIIN(shi)-4](benzoate)4(pyr+), and Ln2Ga8, LnIII2[12-MCGaIIIN(shi)-4]2(isopthalate)4(NH4+)2, are reported herein. The organic scaffold built from salicylhydroxamic acid ligands, is able to efficiently sensitize characteristic sharp transitions of visible- and NIR-emitting Ln(III) ions, , Nd3+, Sm3+, Eu3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+, and Yb3+. A detailed analysis of the photophysical properties have been performed and revealed that YbGa4 exhibits the highest reported quantum yield in the solid state among complexes formed from the ligands containing C-H bonds. In addition, Tb2Ga8 has been used for imaging of HeLa cells opening the way for further biological imaging applications. Acknowledgement: The research leading to these results have received funding from the European Community's Seventh Framework Programme (IRSES Metallacrown - FP7/2007-2013) under grant agreement 611488. This work was also supported in part by the National Science Foundation under grant CHE-1361779, La Ligue contre le Cancer and La Region Centre. S.P. acknowledges support from Institut National de la Sante et de la Recherche Medicale (INSERM). The work in France was carried out in the frame of COST actions (TD1004 and CM1006).

Visible and near-infrared luminescence of heterometallic metallacrowns incorporating Ga(III) and Ln(III) ions

251st National Meeting (2016)

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