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Photophysical Investigation of near Infrared Emitting Lanthanoid Complexes Incorporating Tris(2-Naphthoyl)methane as a New Antenna Ligand

preprint
submitted on 21.01.2019 and posted on 22.01.2019 by Laura Abad Galán, Satoshi Wada, Lee Cameron, Alexandre N. Sobolev, Yasuchika Hasegawa, Eli Zysman-Colman, Mark Ogden, Massimiliano Massi
A conjugated β-triketone, tris(2-naphthoyl)methane (tnmH), has been synthesized and successfully utilized as an antenna moiety for sensitization of the trivalent lanthanoids Eu3+,Sm3+,Yb3+and Nd3+, in an isomorphous series of mononuclear complexes formulated as [Ln(tnm)3(DMSO)2] (Ln3+ = Nd3+, Sm3+, Eu3+, Gd3+and Yb3+). The photophysical properties of the materials were characterized as comprehensively as possible, with overall quantum yields, intrinsic quantum yields based on calculated radiative decays, and sensitization efficiencies reported. This investigation improves understanding of the sensitization processes occurring in the near-infrared (NIR) region systems in particular, where quantitative data is currently scarce. In fact, the [Yb(tnm)3(DMSO)2] and its deuterated analogue, [Yb(tnm)3(d6-DMSO)2], present high values of overall quantum yield of 4% and 6%, respectively, which makes them useful and readily accessible references for future investigation of NIR-emitting systems.

Funding

Illuminating hidden processes in emissive lanthanoid complexes

Australian Research Council

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History

Email Address of Submitting Author

M.Ogden@curtin.edu.au

Institution

Curtin University

Country

Australia

ORCID For Submitting Author

0000-0001-5317-1637

Declaration of Conflict of Interest

No conflict of interest

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