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Rajh T, Masson E, Latt KZ, Smith A, Brugh AM, Dandu N, Trainer D, Curtiss LA, Ngo AT, Hla SW. Light- and Chemical-Doping-Induced Magnetic Behavior of Eu Molecular Systems. Inorg Chem 2023; 62:12721-12729. [PMID: 37506323 DOI: 10.1021/acs.inorgchem.3c01154] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
Variable temperature electron paramagnetic resonance (VT-EPR) was used to investigate the role of the environment and oxidation states of several coordinated Eu compounds. We find that while Eu(III) chelating complexes are diamagnetic, simple chemical reduction results in the formation of paramagnetic species. In agreement with the distorted D3h symmetry of Eu molecular complexes investigated in this study, the EPR spectrum of reduced complexes showed axially symmetric signals (g⊥ = 2.001 and g∥ = 1.994) that were successfully simulated with two Eu isotopes with nuclear spin 5/2 (151Eu and 153Eu with 48% and 52% natural abundance, respectively) and nuclear g-factors 151Eu/153Eu = 2.27. Illumination of water-soluble complex Eu(dipic)3 at 4 K led to the ligand-to-metal charge transfer (LMCT) that resulted in the formation of Eu(II) in a rhombic environment (gx = 2.006, gy = 1.995, gz = 1.988). The existence of LMCT affects the luminescence of Eu(dipic)3, and pre-reduction of the complex to Eu(II)(dipic)3 reversibly reduces red luminescence with the appearance of a weak CT blue luminescence. Furthermore, encapsulation of a large portion of the dipic ligand with Cucurbit[7]uril, a pumpkin-shaped macrocycle, inhibited ligand-to-metal charge transfer, preventing the formation of Eu(II) upon illumination.
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Affiliation(s)
- Tijana Rajh
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, Illinois 60540, United States
- School of Molecular Sciences, Arizona State University, 551 E University Dr, Tempe, Arizona 85281, United States
| | - Eric Masson
- Department of Chemistry, Ohio University, Athens, Ohio 45701, United States
| | - Kyaw Zin Latt
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, Illinois 60540, United States
| | - Ashton Smith
- Department of Chemistry, Ohio University, Athens, Ohio 45701, United States
| | - Alexander M Brugh
- School of Molecular Sciences, Arizona State University, 551 E University Dr, Tempe, Arizona 85281, United States
| | - Naveen Dandu
- Department of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60608, United States
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Daniel Trainer
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, Illinois 60540, United States
| | - Larry A Curtiss
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Anh T Ngo
- Department of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60608, United States
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Saw-Wai Hla
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, Illinois 60540, United States
- Nanoscale & Quantum Phenomena Institute, and Department of Physics & Astronomy, Ohio University, Athens, Ohio 45701, United States
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Abstract
Many applications of lanthanides exploit their electron spin relaxation properties. Double electron-electron measurements of distances are possible because of the relatively long relaxation times of Gd3+. Relaxation enhancement measurements of distance are possible because of the much shorter relaxation times of other lanthanides. Magnetic resonance imaging contrast agents use the long relaxation time of the S-state Gd3+ ion, and NMR shift reagents use the fast relaxation of selected other lanthanides. Other than Gd3+ and the isoelectronic Eu2+ ion, spin relaxation of the lanthanides is so fast that their EPR spectra can be observed only in the liquid helium temperature range. In this chapter the EPR properties of each of the lanthanides is briefly summarized, with an emphasis on electron spin relaxation.
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Affiliation(s)
- Joseph E McPeak
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO, United States
| | - Sandra S Eaton
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO, United States
| | - Gareth R Eaton
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO, United States.
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Migliorati V, Filipponi A, Sessa F, Lapi A, Serva A, D'Angelo P. Solvation structure of lanthanide(iii) bistriflimide salts in acetonitrile solution: a molecular dynamics simulation and EXAFS investigation. Phys Chem Chem Phys 2019; 21:13058-13069. [DOI: 10.1039/c9cp01417a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Lanthanide3+ ions in acetonitrile solutions of bistriflimide salts form 10-fold coordination complexes composed of both solvent molecules and counterions
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Affiliation(s)
| | - Adriano Filipponi
- Dipartimento di Scienze Fisiche e Chimiche
- Università degli Studi dell’Aquila, Via Vetoio
- 67100 L’Aquila
- Italy
| | - Francesco Sessa
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | - Andrea Lapi
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
- Istituto CNR di Metodologie Chimiche-IMC
| | - Alessandra Serva
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | - Paola D'Angelo
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
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Ribbeck T, Zottnick SH, Kerpen C, Landmann J, Ignat’ev NV, Müller-Buschbaum K, Finze M. Anhydrous, Homoleptic Lanthanide Frameworks with the Pentafluoroethyltricyanoborate Anion. Inorg Chem 2017; 56:2278-2286. [DOI: 10.1021/acs.inorgchem.6b02984] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Tatjana Ribbeck
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Sven H. Zottnick
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Christoph Kerpen
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Johannes Landmann
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | | | - Klaus Müller-Buschbaum
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Maik Finze
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institut für nachhaltige Chemie & Katalyse mit Bor (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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Bodizs G, Helm L. Solvent Exchange and Electron-Spin Relaxation on Homoleptic Acetonitrile Complexes of Trivalent Lanthanides. Inorg Chem 2015; 54:1974-82. [DOI: 10.1021/ic5028493] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gabriella Bodizs
- Institut des sciences et ingénierie chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Lothar Helm
- Institut des sciences et ingénierie chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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