Photophysical investigation of near infrared emitting lanthanoid complexes incorporating tris(2-naphthoyl)methane as a new antenna ligand
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A conjugated β-triketone, tris(2-naphthoyl)methane ( tnm H), 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.
Abad Galán , L , Wada , S , Cameron , L , Sobolev , A , Hasegawa , Y , Zysman-Colman , E , Ogden , M & Massi , M 2019 , ' Photophysical investigation of near infrared emitting lanthanoid complexes incorporating tris(2-naphthoyl)methane as a new antenna ligand ' , Dalton Transactions , vol. 48 , no. 11 , pp. 3768-3776 . https://doi.org/10.1039/C8DT04749A
Copyright © 2019 The Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1039/C8DT04749A
DescriptionThis research was partially supportedby the Australian Research Council's Discovery Projects funding scheme (project DP17010189), and a Royal Society International Exchanges Grant. EZ-C thanks EPSRC (EP/M02105X/1) for support. L.A.G thanks Curtin University for the postgraduate scholarship.
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