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Triple-Decker Hexaazamacrocyclic Lanthanide(III) Complexes: Structure, Magnetic Properties, and Temperature-Dependent Luminescence.
Inorg Chem
August 2024
Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie, Wrocław 50-383, Poland.
The reaction of fluoride anions with mononuclear rare-earth(III) complexes of the hexaazamacrocycle derived from 2,6-diformylpyridine and ethylenediamine affords trinuclear coordination compounds . The X-ray crystal structures of these complexes show triplex cationic complexes where the three roughly parallel macrocyclic lanthanide(III) units are linked by bis-μ-F bridges. The detailed analysis of the photophysical properties of the and complexes reveals different temperature dependence of luminescence intensity and luminescence decay time of the Eu(III) and Tb(III) derivatives.
View Article and Find Full Text PDFHeterometallic lanthanide complexes with site-specific binding that enable simultaneous visible and NIR-emission.
Front Chem
July 2023
Department of Chemistry, Faculty of Science and Engineering, The University of Manchester, Manchester, United Kingdom.
Macrocyclic lanthanide complexes have become widely developed due to their distinctive luminescence characteristics and wide range of applications in biological imaging. However, systems with sufficient brightness and metal selectivity can be difficult to produce on a molecular scale. Presented herein is the stepwise introduction of differing lanthanide ions in a bis-DO3A/DTPA scaffold to afford three trinuclear bimetallic [LnLn'] lanthanide complexes with site-specific, controlled binding [(YbTb), (EuTb), (YbEu)].
View Article and Find Full Text PDFSelf-assembly and luminescence of trinuclear lanthanide based supramolecular circular helicates.
Chem Commun (Camb)
September 2021
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China.
A series of trinuclear lanthanide circular helicates [LnL]Cl have been synthesized supramolecular subcomponent self-assembly. Photophysical studies demonstrate that the unique helical bis-tetradentate 1,29-dialdehyde ligand L could serve as an effective sensitizer for Sm, Eu, Nd and Yb ions exhibiting efficient characteristic fluorescence emission because of the shell-type blocking of the ligand, which makes them the first circular helicates exhibiting near-infrared lanthanide fluorescence.
View Article and Find Full Text PDFA series of lanthanide(III) metal-organic frameworks derived from a pyridyl-dicarboxylate ligand: single-molecule magnet behaviour and luminescence properties.
Dalton Trans
October 2020
State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, National Demonstration Centre for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China. and State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210023, China.
The reactions of LnIII ions with a versatile pyridyl-decorated dicarboxylic acid ligand lead to the formation of a series of novel three-dimensional (3D) Ln-MOFs, [Ln3(pta)4(Hpta)(H2O)]·xH2O (Ln = Dy (1), Eu (2), Gd (3), Tb (4), H2pta = 2-(4-pyridyl)-terephthalic acid, x = 6 for 1, 2.5 for 2, 1.5 for 3 and 2 for 4).
View Article and Find Full Text PDFPhotodynamics and Luminescence of Mono- and Tri-Nuclear Lanthanide Complexes in the Gas Phase and in Solution.
Chemphyschem
November 2018
Department of Chemistry, Technische Universität Kaiserslautern, Erwin-Schrödinger Str. 52, D-, 67663, Kaiserslautern, Germany.
Lanthanide ions (Dy , Eu ) are stabilized by coordination with two Schiff base ligands in compounds [Dy{H L} ](NO )(EtOH)(H O) (1) and [Eu{H L} ](NO )(H O) (3) (H L, 2,2'-{[(2-aminoethyl)imino]bis[2,1-ethanediyl-nitriloethylidyne]}bis-2-hydroxy-benzoic acid). The latter is reported here for the first time. Both luminescence and ultrafast photodynamics after photoexcitation via a ligand absorption band (∼400 nm) have been studied.
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