Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 40, Pages 10091-10098Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201802010
Keywords
energy transfer; lanthanides; luminescence; photochemistry; proton transfer
Categories
Funding
- NSFC [21771197, 21720102007]
- STP Project of Guangzhou [201504010031]
- NSF of Guangdong Province [S2013030013474]
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Two series of isostructural lanthanide coordination complexes, namely, LIFM-42(Ln) (Ln=Eu, Tb, Gd, in which LIFM stands for the Lehn Institute of Functional Materials) and LIFM-43(Ln) (Ln=Er, Yb), were synthesized through the self-assembly of an excited-state intramolecular proton transfer (ESIPT) ligand, 5-[2-(5-fluoro-2-hydroxyphenyl)-4,5-bis(4-fluorophenyl)-1H-imidazol-1-yl]isophthalic acid (H(2)hpi2cf), with different lanthanide ions. In the coordination structures linked by the ligands and oxo-bridged Ln(2)(III) clusters (for LIFM-42(Ln) series) or isolated Ln(III) ions (for LIFM-43(Ln) series), the ESIPT ligand can serve as both the host and antenna for protecting and sensitizing the photoluminescence (PL) of Ln(III) ions. Meanwhile, the -OHN active sites on the ligands are vacant, which provides availability to systematically explore the PL behavior of Ln complexes with ESIPT interference. Based on the accepting levels of different lanthanide ions, energy transfer can occur from the T-1(K*) or T-1(E*) (K*=excited keto form, E*=excited enol form) excited states of the ligand. Furthermore, the sensitized lanthanide luminescence in both visible and near-infrared regions, as well as the remaining K* emission of the ligand, can be modulated by the ESIPT responsiveness to different solvents, anions, and temperature.
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