1
|
Tacconi L, Leiszner SS, Briganti M, Cucinotta G, Otero E, Mannini M, Perfetti M. Temperature Induced Reversible Switching of the Magnetic Anisotropy in a Neodymium Complex Adsorbed on Graphite. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2401627. [PMID: 38773906 DOI: 10.1002/smll.202401627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/22/2024] [Indexed: 05/24/2024]
Abstract
Controlling the magnetic anisotropy of molecular layers assembled on a surface is one of the challenges that needs to be addressed to create the next-generation spintronic devices. Recently, metal complexes that show a reversible solid-state switch of their magnetic anisotropy in response to physical stimuli, such as temperature and magnetic field, have been discovered. The complex Nd(trensal) (H3trensal = 2,2',2''-tris(salicylideneimino)triethylamine) is predicted to exhibit such property. An ultra-thin film of Nd(trensal) is deposited on highly ordered pyrolytic graphite as a proof-of-concept system to show that this property can be retained at the nanoscale on a layered material. By combining single crystal magnetometric measurements and synchrotron X-ray-based absorption techniques, supported by multiplet ligand field simulations based on the trigonal crystal field surrounding the lanthanide centre, it is demonstrated that changing the temperature reverses the magnetic anisotropy of an ordered film of Nd(trensal), thus opening significant perspectives for the realization of a novel family of temperature-controlled molecular spintronic devices.
Collapse
Affiliation(s)
- Leonardo Tacconi
- Department of Chemistry "U. Schiff", Università degli Studi di Firenze & INSTM RU of Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
| | - Sofie S Leiszner
- Department of Chemistry, Aarhus University, Langelandsgade 140, Aarhus C, 8000, Denmark
| | - Matteo Briganti
- Department of Chemistry "U. Schiff", Università degli Studi di Firenze & INSTM RU of Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
| | - Giuseppe Cucinotta
- Department of Chemistry "U. Schiff", Università degli Studi di Firenze & INSTM RU of Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
| | - Edwige Otero
- Synchrotron, SOLEIL, L'Orme des Merisiers, Saint-Aubin, 91190, France
| | - Matteo Mannini
- Department of Chemistry "U. Schiff", Università degli Studi di Firenze & INSTM RU of Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
| | - Mauro Perfetti
- Department of Chemistry "U. Schiff", Università degli Studi di Firenze & INSTM RU of Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
| |
Collapse
|
2
|
Manvell AS, Pfleger R, Bonde NA, Briganti M, Mattei CA, Nannestad TB, Weihe H, Powell AK, Ollivier J, Bendix J, Perfetti M. LnDOTA puppeteering: removing the water molecule and imposing tetragonal symmetry. Chem Sci 2023; 15:113-123. [PMID: 38131074 PMCID: PMC10732010 DOI: 10.1039/d3sc03928e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Accepted: 10/25/2023] [Indexed: 12/23/2023] Open
Abstract
Complexes of lanthanide(iii) ions (Ln) with tetraazacyclododecane-N,N',N'',N'''-tetraacetate (DOTA) are a benchmark in the field of magnetism due to their well-investigated and sometimes surprising features. Ab initio calculations suggest that the ninth ligand, an axial water molecule, is key in defining the magnetic properties because it breaks the potential C4 symmetry of the resulting complexes. In this paper, we experimentally isolate the role of the water molecule by excluding it from the metal coordination sphere without altering the chemical structure of the ligand. Our complexes are therefore designed to be geometrically tetragonal and strict crystallographic symmetry is achieved by exploiting a combination of solution ionic strength and solid state packing effects. A thorough multitechnique approach has been used to unravel the electronic structure and magnetic anisotropy of the complexes. Moreover, the geometry enhancement allows us to predict, using only one angle obtained from the crystal structure, the ground state composition of all the studied derivatives (Ln = Tb to Yb). Therefore, these systems also provide an excellent platform to test the validity and limitations of the ab initio methods. Our combined experimental and theoretical investigation proves that the water molecule is indeed key in defining the magnetic anisotropy and the slow relaxation of these complexes.
Collapse
Affiliation(s)
- Anna Schannong Manvell
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
| | - Rouven Pfleger
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology Engesserstrasse 15 76131 Karlsruhe Germany
| | - Niels Andreas Bonde
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
- Institut Laue-Langevin 71 avenue des Martyrs, CS 20156 38042 Grenoble Cedex 9 France
| | - Matteo Briganti
- Department of Chemistry U. Schiff Via della Lastruccia 3 50019 Sesto Fiorentino Italy
| | - Carlo Andrea Mattei
- Department of Chemistry U. Schiff Via della Lastruccia 3 50019 Sesto Fiorentino Italy
| | - Theis Brock Nannestad
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
| | - Høgni Weihe
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
| | - Annie K Powell
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology Engesserstrasse 15 76131 Karlsruhe Germany
| | - Jacques Ollivier
- Institut Laue-Langevin 71 avenue des Martyrs, CS 20156 38042 Grenoble Cedex 9 France
| | - Jesper Bendix
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
| | - Mauro Perfetti
- Department of Chemistry U. Schiff Via della Lastruccia 3 50019 Sesto Fiorentino Italy
| |
Collapse
|
3
|
Approaching the uniaxiality of magnetic anisotropy in single-molecule magnets. Sci China Chem 2023. [DOI: 10.1007/s11426-022-1423-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
|
4
|
Connolly BJP, Lian JYJ, Bernhardt PV, Riley MJ. Ab Initio Investigation of the Na 3[Ln(ODA) 3]·2NaClO 4·6H 2O (Ln = Ce-Yb; ODA = Oxydiacetate) Series. Inorg Chem 2023; 62:1328-1340. [PMID: 36651855 DOI: 10.1021/acs.inorgchem.2c01764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In this work, the Na3[Ln(ODA)3]·2NaClO4·6H2O (Ln = Ce-Yb; ODA = oxydiacetate) series was analyzed with the ab initio ligand field theory (AILFT) module of the ORCA computational suite. The results were discussed within the framework of the angular overlap model (AOM) and compared to literature data. We find that the structural changes observed across the series exemplifies the effects of the lanthanide contraction also manifesting in the value of the AOM parameters. It is also shown that the complete active space self-consistent field (CASSCF) methodology is sufficient to describe the ligand field interactions in mononuclear lanthanide complexes, and the effects of dynamic correlation, through n-electron valence state perturbation theory (NEVPT2), are discussed. The calculated ligand field parameters of the present work are compared to the experimentally derived values from the literature.
Collapse
Affiliation(s)
- Blake J P Connolly
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD4072, Australia
| | - James Y J Lian
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD4072, Australia
| | - Paul V Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD4072, Australia
| | - Mark J Riley
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD4072, Australia
| |
Collapse
|
5
|
Ungur L, Szabo B, ALOthman ZA, Al-Kahtani AAS, Chibotaru LF. Mechanisms of Luminescence in Lanthanide Complexes: A Crucial Role of Metal-Ligand Covalency. Inorg Chem 2022; 61:5972-5976. [PMID: 35420038 DOI: 10.1021/acs.inorgchem.2c00071] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A current understanding of the luminescence of lanthanide complexes is based on the phenomenological Judd-Ofelt (JO) theory. However, the mechanisms of electric-dipole transitions lying at its basis were never subjected to a rigorous analysis. Here, we investigate the contributions to the electric-dipole transitions in the Er3+ 4S3/2 → 4I15/2 band of an erbium trensal complex using state-of-the-art ab initio calculations. We find that the conventional JO mechanism based on the electrostatic crystal field yields only a quarter of the integral intensity of this band. Accordingly, three quarters of it is contributed by covalent binding of erbium and ligand orbitals via three major mechanisms, the 4f ligand and ligand-ligand electric-dipole transitions and covalent enhancement of the hybridization of 4f and even empty orbitals of erbium. We expect that these findings will inspire the design of efficient rare-earth luminescent materials.
Collapse
Affiliation(s)
- Liviu Ungur
- Department of Chemistry, National University of Singapore, Block S8, Level 3, 3 Science Drive 3, Singapore 117543, Singapore
| | - Bernat Szabo
- Theory of Nanomaterials Group, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven B-3001, Belgium
| | - Zeid A ALOthman
- Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Abdullah A S Al-Kahtani
- Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Liviu F Chibotaru
- Theory of Nanomaterials Group, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven B-3001, Belgium.,Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| |
Collapse
|
6
|
Kofod N, Nawrocki P, Sørensen TJ. Arel: Investigating [Eu(H 2O) 9] 3+ Photophysics and Creating a Method to Bypass Luminescence Quantum Yield Determinations. J Phys Chem Lett 2022; 13:3096-3104. [PMID: 35357175 DOI: 10.1021/acs.jpclett.2c00418] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Lanthanide luminescence has been treated separate from molecular photophysics, although the underlying phenomena are the same. As the optical transitions observed in the trivalent lanthanide ions are forbidden, they do belong to the group that molecular photophysics has yet to conquer, yet the experimental descriptors remain valid. Herein, the luminescence quantum yields (ϕlum), luminescence lifetimes (τobs), oscillator strengths (f), and the rates of nonradiative (knr) and radiative (kr ≡ A) deactivation of [Eu(H2O)9]3+ were determined. Further, it was shown that instead of a full photophysical characterization, it is possible to relate changes in transition probabilities to the relative parameter Arel, which does not require reference data. While Arel does not afford comparisons between experiments, it resolves emission intensity changes due to emitter properties from intensity changes due to environmental effects and differences in the number of photons absorbed. When working with fluorescence this may seem trivial; when working with lanthanide luminescence it is not.
Collapse
Affiliation(s)
- Nicolaj Kofod
- Department of Chemistry & Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark
| | - Patrick Nawrocki
- Department of Chemistry & Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark
| | - Thomas Just Sørensen
- Department of Chemistry & Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark
| |
Collapse
|
7
|
Kragskow JGC, Marbey J, Buch CD, Nehrkorn J, Ozerov M, Piligkos S, Hill S, Chilton NF. Analysis of vibronic coupling in a 4f molecular magnet with FIRMS. Nat Commun 2022; 13:825. [PMID: 35149674 PMCID: PMC8837795 DOI: 10.1038/s41467-022-28352-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 01/19/2022] [Indexed: 11/09/2022] Open
Abstract
Vibronic coupling, the interaction between molecular vibrations and electronic states, is a fundamental effect that profoundly affects chemical processes. In the case of molecular magnetic materials, vibronic, or spin-phonon, coupling leads to magnetic relaxation, which equates to loss of magnetic memory and loss of phase coherence in molecular magnets and qubits, respectively. The study of vibronic coupling is challenging, and most experimental evidence is indirect. Here we employ far-infrared magnetospectroscopy to directly probe vibronic transitions in [Yb(trensal)] (where H3trensal = 2,2,2-tris(salicylideneimino)trimethylamine). We find intense signals near electronic states, which we show arise due to an "envelope effect" in the vibronic coupling Hamiltonian, which we calculate fully ab initio to simulate the spectra. We subsequently show that vibronic coupling is strongest for vibrational modes that simultaneously distort the first coordination sphere and break the C3 symmetry of the molecule. With this knowledge, vibrational modes could be identified and engineered to shift their energy towards or away from particular electronic states to alter their impact. Hence, these findings provide new insights towards developing general guidelines for the control of vibronic coupling in molecules.
Collapse
Affiliation(s)
- Jon G C Kragskow
- Department of Chemistry, School of Natural Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Jonathan Marbey
- National High Magnetic Field Laboratory, Tallahassee, FL, 32310, USA.,Department of Physics, Florida State University, Tallahassee, FL, 32306, USA
| | - Christian D Buch
- Department of Chemistry, University of Copenhagen, DK-2100, Copenhagen, Denmark
| | - Joscha Nehrkorn
- National High Magnetic Field Laboratory, Tallahassee, FL, 32310, USA
| | - Mykhaylo Ozerov
- National High Magnetic Field Laboratory, Tallahassee, FL, 32310, USA
| | - Stergios Piligkos
- Department of Chemistry, University of Copenhagen, DK-2100, Copenhagen, Denmark.
| | - Stephen Hill
- National High Magnetic Field Laboratory, Tallahassee, FL, 32310, USA. .,Department of Physics, Florida State University, Tallahassee, FL, 32306, USA.
| | - Nicholas F Chilton
- Department of Chemistry, School of Natural Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| |
Collapse
|
8
|
Salehzadeh S, Golbedaghi R, Rakhtshah J, Adams H. A new series of manganese(II) complexes of three fully condensed Schiff base ligands derived from some symmetrical and asymmetrical tripodal tetraamines and 2-pyridinecarboxyaldehyde. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
9
|
Kofod N, Nawrocki P, Platas-Iglesias C, Sørensen TJ. Electronic Structure of Ytterbium(III) Solvates-a Combined Spectroscopic and Theoretical Study. Inorg Chem 2021; 60:7453-7464. [PMID: 33949865 DOI: 10.1021/acs.inorgchem.1c00743] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The wide range of optical and magnetic properties of lanthanide(III) ions is associated with their intricate electronic structures which, in contrast to lighter elements, is characterized by strong relativistic effects and spin-orbit coupling. Nevertheless, computational methods are now capable of describing the ladder of electronic energy levels of the simpler trivalent lanthanide ions, as well as the lowest energy term of most of the series. The electronic energy levels result from electron configurations that are first split by spin-orbit coupling into groups of energy levels denoted by the corresponding Russell-Saunders terms. Each of these groups are then split by the ligand field into the actual electronic energy levels known as microstates or sometimes mJ levels. The ligand-field splitting directly informs on the coordination geometry and is a valuable tool for determining the structure and thus correlating the structure and properties of metal complexes in solution. The issue with lanthanide complexes is that the determination of complex structures from ligand-field splitting remains a very challenging task. In this paper, the optical spectra-absorption, luminescence excitation, and luminescence emission-of ytterbium(III) solvates were recorded in water, methanol, dimethyl sulfoxide (DMSO), and N,N-dimethylformamide (DMF). The electronic energy levels, that is, the microstates, were resolved experimentally. Subsequently, density functional theory calculations were used to model the structures of the solvates, and ab initio relativistic complete active space self-consistent field calculations (CASSCF) were employed to obtain the microstates of the possible structures of each solvate. By comparing the experimental and theoretical data, it was possible to determine both the coordination number and solution structure of each solvate. In water, methanol, and N,N-dimethylformamide, the solvates were found to be eight-coordinated and have a square antiprismatic coordination geometry. In DMSO, the speciation was found to be more complicated. The robust methodology developed for comparing experimental spectra and computational results allows the solution structures of homoleptic lanthanide complexes to be determined.
Collapse
Affiliation(s)
- Nicolaj Kofod
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark
| | - Patrick Nawrocki
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas and Departamento de Química, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Thomas Just Sørensen
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark
| |
Collapse
|
10
|
Buch CD, Hansen SH, Mitcov D, Tram CM, Nichol GS, Brechin EK, Piligkos S. Design of pure heterodinuclear lanthanoid cryptate complexes. Chem Sci 2021; 12:6983-6991. [PMID: 34123326 PMCID: PMC8153240 DOI: 10.1039/d1sc00987g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 04/14/2021] [Indexed: 01/01/2023] Open
Abstract
Heterolanthanide complexes are difficult to synthesize owing to the similar chemistry of the lanthanide ions. Consequently, very few purely heterolanthanide complexes have been synthesized. This is despite the fact that such complexes hold interesting optical and magnetic properties. To fine-tune these properties, it is important that one can choose complexes with any given combination of lanthanides. Herein we report a synthetic procedure which yields pure heterodinuclear lanthanide cryptates LnLn*LX3 (X = NO3 - or OTf-) based on the cryptand H3L = N[(CH2)2N[double bond, length as m-dash]CH-R-CH[double bond, length as m-dash]N-(CH2)2]3N (R = m-C6H2OH-2-Me-5). In the synthesis the choice of counter ion and solvent proves crucial in controlling the Ln-Ln* composition. Choosing the optimal solvent and counter ion afford pure heterodinuclear complexes with any given combination of Gd(iii)-Lu(iii) including Y(iii). To demonstrate the versatility of the synthesis all dinuclear combinations of Y(iii), Gd(iii), Yb(iii) and Lu(iii) were synthesized resulting in 10 novel complexes of the form LnLn*L(OTf)3 with LnLn* = YbGd 1, YbY 2, YbLu 3, YbYb 4, LuGd 5, LuY 6, LuLu 7, YGd 8, YY 9 and GdGd 10. Through the use of 1H, 13C NMR and mass spectrometry the heterodinuclear nature of YbGd, YbY, YbLu, LuGd, LuY and YGd was confirmed. Crystal structures of LnLn*L(NO3)3 reveal short Ln-Ln distances of ∼3.5 Å. Using SQUID magnetometry the exchange coupling between the lanthanide ions was found to be anti-ferromagnetic for GdGd and YbYb while ferromagnetic for YbGd.
Collapse
Affiliation(s)
- Christian D Buch
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
| | - Steen H Hansen
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
| | - Dmitri Mitcov
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
| | - Camilla M Tram
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
| | - Gary S Nichol
- EaStCHEM School of Chemistry, University of Edinburgh Edinburgh UK
| | - Euan K Brechin
- EaStCHEM School of Chemistry, University of Edinburgh Edinburgh UK
| | - Stergios Piligkos
- Department of Chemistry, University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Denmark
| |
Collapse
|
11
|
Parmar VS, Mills DP, Winpenny REP. Mononuclear Dysprosium Alkoxide and Aryloxide Single-Molecule Magnets. Chemistry 2021; 27:7625-7645. [PMID: 33555090 PMCID: PMC8252031 DOI: 10.1002/chem.202100085] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Indexed: 12/17/2022]
Abstract
Recent studies have shown that mononuclear lanthanide (Ln) complexes can be high‐performing single‐molecule magnets (SMMs). Recently, there has been an influx of mononuclear Ln alkoxide and aryloxide SMMs, which have provided the necessary geometrical control to improve SMM properties and to allow the intricate relaxation dynamics of Ln SMMs to be studied in detail. Here non‐aqueous Ln alkoxide and aryloxide chemistry applied to the synthesis of low‐coordinate mononuclear Ln SMMs are reviewed. The focus is on mononuclear DyIII alkoxide and aryloxide SMMs with coordination numbers up to eight, covering synthesis, solid‐state structures and magnetic attributes. Brief overviews are also provided of mononuclear TbIII, HoIII, ErIII and YbIII alkoxide and aryloxide SMMs.
Collapse
Affiliation(s)
- Vijay S Parmar
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - David P Mills
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Richard E P Winpenny
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| |
Collapse
|
12
|
Buch CD, Hansen SH, Tram CM, Mitcov D, Piligkos S. Functionalized Trigonal Lanthanide Complexes: A New Family of 4f Single-Ion Magnets. Inorg Chem 2020; 59:16328-16340. [PMID: 33124425 DOI: 10.1021/acs.inorgchem.0c02121] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the synthesis, characterization, and magnetic properties of eight neutral functionalized trigonal lanthanide coordination complexes LnL with Ln = Gd (1), Tb (2), Dy (3), Ho (4), Er (5), Tm (6), Yb (7), Lu (8). These were prepared through a one-pot synthesis where, first, the ligand H3L was synthesized in situ through a Schiff base reaction of tris(2-aminoethyl)amine with 2,6-diformyl-p-cresol. Following addition of Ln(OTf)3·xH2O and base, LnL was obtained. Powder X-ray diffraction confirms that all complexes are isostructural. LnL contain pendant, noncoordinating carbonyl functions that are reactive and represent direct anchoring points to appropriately functionalized surfaces. Furthermore, these reactive carbonyl functions can be used to postfunctionalize LnL: for example, with aromatic π systems. We present herein the Schiff base condensation of 7 with benzylamine to yield 9 as well as the characterization and magnetic properties of 9. Our study establishes LnL as a truly versatile module for the surface deposition of Ln-based single-ion magnets.
Collapse
Affiliation(s)
- Christian D Buch
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Steen H Hansen
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Camilla M Tram
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Dmitri Mitcov
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Stergios Piligkos
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| |
Collapse
|
13
|
Bonde NA, Petersen JB, Sørensen MA, Nielsen UG, Fåk B, Rols S, Ollivier J, Weihe H, Bendix J, Perfetti M. Importance of Axial Symmetry in Elucidating Lanthanide-Transition Metal Interactions. Inorg Chem 2020; 59:235-243. [PMID: 31825607 DOI: 10.1021/acs.inorgchem.9b02064] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
In this paper, we experimentally study and model the electron donating character of an axial diamagnetic Pd2+ ion in four metalloligated lanthanide complexes of formula [PPh4][Ln{Pd(SAc)4}2] (SAc- = thioacetate, Ln = Tb, Dy, Ho, and Er). A global model encompassing inelastic neutron scattering, torque magnetometry, and dc magnetometry allows to precisely determine the energy level structure of the complexes. Solid state nuclear magnetic resonance reveals a less donating character of Pd2+ compared to the previously reported isostructural Pt2+-based complexes. Consequently, all complexes invariably show a lower crystal field strength compared to their Pt2+-analogues. The dynamic properties show an enhanced single molecule magnet behavior due to the suppression of quantum tunneling, in agreement with our model.
Collapse
Affiliation(s)
- Niels A Bonde
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark.,Institut Laue-Langevin , 71 avenue des Martyrs, CS 20156 , 38042 Grenoble Cedex 9 , France
| | - Jonatan B Petersen
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark
| | - Mikkel A Sørensen
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark
| | - Ulla G Nielsen
- Department of Physics, Chemistry and Pharmacy , University of Southern Denmark , Campusvej 55 , 5230 Odense M , Denmark
| | - Björn Fåk
- Institut Laue-Langevin , 71 avenue des Martyrs, CS 20156 , 38042 Grenoble Cedex 9 , France
| | - Stéphane Rols
- Institut Laue-Langevin , 71 avenue des Martyrs, CS 20156 , 38042 Grenoble Cedex 9 , France
| | - Jacques Ollivier
- Institut Laue-Langevin , 71 avenue des Martyrs, CS 20156 , 38042 Grenoble Cedex 9 , France
| | - Høgni Weihe
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark
| | - Jesper Bendix
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark
| | - Mauro Perfetti
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark
| |
Collapse
|
14
|
Buch CD, Mitcov D, Piligkos S. Lanthanide cryptate monometallic coordination complexes. Dalton Trans 2020; 49:13557-13565. [PMID: 32955062 DOI: 10.1039/d0dt02448a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We report the synthesis, characterisation and magnetic properties of six novel neutral lanthanide cryptate coordination complexes. Reaction of 2,6-diformyl-4-methylphenol, tris(2-aminoethyl)amine and Ln(OTf)3·9H2O in the ratio 3 : 2 : 1, respectively, and in the presence of base affords the isolation of the six complexes LnL·4H2O (Ln = Tb (1), Dy (2), Ho (3), Er (4), Tm (5) and Yb (6)), with H3L being the cryptand N[(CH2)2N[double bond, length as m-dash]CH-R-CH[double bond, length as m-dash]N-(CH2)2]3N (R = m-C6H2OH-2-Me-5). Powder X-ray diffraction confirms that the six complexes are isostructural. The crystal structure of 6 reveals that the Ln(iii) centre is heptacoordinated, in a geometry close to a monocapped distorted octahedron and lies on a pseudo (non-crystallographically imposed) C3 axis. This coordination sphere is similar to the one found in the previously studied Ln(trensal) complexes (H3trensal = 2,2',2''-tris(salicylideneimino)triethylamine). The static and dynamic magnetic properties of these complexes were investigated by SQUID magnetometry. Crystal field parameters were determined for all complexes by modelling of the direct current magnetic susceptibility and variable-temperature-variable-field magnetisation data. As for Ln(trensal), only complexes containing the Kramers ions Dy, Er and Yb displayed out-of-phase susceptibility signals in SQUID measurements in an applied magnetic field. Investigation of the dynamic susceptibility of the Yb complex revealed that the magnetic relaxation is governed by a direct process at low temperatures and a Raman process at higher temperatures, similar to Yb(trensal).
Collapse
Affiliation(s)
- Christian D Buch
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
| | - Dmitri Mitcov
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
| | - Stergios Piligkos
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
| |
Collapse
|
15
|
Series of Chloranilate-Bridged Dinuclear Lanthanide Complexes: Kramers Systems Showing Field-Induced Slow Magnetic Relaxation. MAGNETOCHEMISTRY 2019. [DOI: 10.3390/magnetochemistry5020030] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A series of chloralilate-bridged dinuclear lanthanide complexes of formula [{LnIII(Tp)2}2(μ-Cl2An)]·2CH2Cl2, where Cl2An2− and Tp− represent the chloranilate and hydrotris (pyrazolyl)borate ligands, respectively, and Ln = Gd (1), Tb (2), Ho (3), Er (4), and Yb (5) was synthesized. All five complexes were characterized by an elemental analysis, infrared spectroscopy, single crystal X-ray diffraction, and SQUID measurements. The complexes 1–5 in the series were all isostructural. A comparison of the temperature dependence of the dc magnetic susceptibility data of these complexes revealed clear differences depending on the lanthanide center. Ac magnetic susceptibility measurements revealed that none of the five complexes exhibited a slow magnetic relaxation under a zero applied dc field. On the other hand, the Kramers systems (complexes 4 and 5) clearly displayed a slow magnetic relaxation under applied dc fields, suggesting field-induced single-molecule magnets that occur through Orbach and Raman relaxation processes.
Collapse
|
16
|
Perfetti M, Gysler M, Rechkemmer-Patalen Y, Zhang P, Taştan H, Fischer F, Netz J, Frey W, Zimmermann LW, Schleid T, Hakl M, Orlita M, Ungur L, Chibotaru L, Brock-Nannestad T, Piligkos S, van Slageren J. Determination of the electronic structure of a dinuclear dysprosium single molecule magnet without symmetry idealization. Chem Sci 2019; 10:2101-2110. [PMID: 30842867 PMCID: PMC6375364 DOI: 10.1039/c8sc03170c] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 12/12/2018] [Indexed: 11/29/2022] Open
Abstract
We present the in-depth determination of the magnetic properties and electronic structure of the luminescent and volatile dysprosium-based single molecule magnet [Dy2(bpm)(fod)6] (Hfod = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione, bpm = 2,2'-bipyrimidine). Ab initio calculations were used to obtain a global picture of the electronic structure and to predict possible single molecule magnet behaviour, confirmed by experiments. The orientation of the susceptibility tensor was determined by means of cantilever torque magnetometry. An experimental determination of the electronic structure of the lanthanide ion was obtained combining Luminescence, Far Infrared and Magnetic Circular Dichroism spectroscopies. Fitting these energies to the full single ion plus crystal field Hamiltonian allowed determination of the eigenstates and crystal field parameters of a lanthanide complex without symmetry idealization. We then discuss the impact of a stepwise symmetry idealization on the modelling of the experimental data. This result is particularly important in view of the misleading outcomes that are often obtained when the symmetry of lanthanide complexes is idealized.
Collapse
Affiliation(s)
- Mauro Perfetti
- Institut für Physikalische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany .
| | - Maren Gysler
- Institut für Physikalische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany .
| | - Yvonne Rechkemmer-Patalen
- Institut für Physikalische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany .
| | - Peng Zhang
- Institut für Physikalische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany .
| | - Hatice Taştan
- Institut für Physikalische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany .
| | - Florian Fischer
- Institut für Physikalische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany .
| | - Julia Netz
- Institut für Physikalische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany .
| | - Wolfgang Frey
- Institut für Organische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany
| | - Lucas W Zimmermann
- Institut für Anorganische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany
| | - Thomas Schleid
- Institut für Anorganische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany
| | - Michael Hakl
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL) , CNRS , UGA , 38042 Grenoble , France
| | - Milan Orlita
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL) , CNRS , UGA , 38042 Grenoble , France
- Institute of Physics , Charles University , Ke Karlovu 5 , 12116 Praja 2 , Czech Republic
| | - Liviu Ungur
- Theory of Nanomaterials Group , Katholieke Universiteit Leuven , Celestijnenlaan 220F , 3001 Leuven , Belgium
| | - Liviu Chibotaru
- Theory of Nanomaterials Group , Katholieke Universiteit Leuven , Celestijnenlaan 220F , 3001 Leuven , Belgium
| | - Theis Brock-Nannestad
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , 2100 , Denmark
| | - Stergios Piligkos
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , 2100 , Denmark
| | - Joris van Slageren
- Institut für Physikalische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany .
| |
Collapse
|
17
|
Abstract
The recently discovered thermal elasticity of magnetic anisotropy is not at all an exotic phenomenon. For many lanthanide complexes the qualitative nature of their magnetic anisotropy changes as a function of temperature and magnetic field; for some, even multiple times. The theoretically predicted existence of such multi-switch compounds is experimentally corroborated.
Collapse
Affiliation(s)
- Mauro Perfetti
- University of Copenhagen, Universitetsparken, 5, 2100 Copenhagen, Denmark.
| | - Jesper Bendix
- University of Copenhagen, Universitetsparken, 5, 2100 Copenhagen, Denmark.
| |
Collapse
|
18
|
Abstract
Achieving control over coordination geometries in lanthanide complexes remains a challenge to the coordination chemist. This is particularly the case in the field of molecule-based magnetism, where barriers for magnetic relaxation processes as well as tunneling pathways are strongly influenced by the lanthanide coordination geometry. Addressing the challenge of design of 4f-element coordination environments, the ubiquitous Ln(hfac)3 moieties have been shown to be applicable as Lewis acids coordinating transition metal acetylacetonates facially leading to simple, chiral lanthanide–transition metal heterodinuclear complexes. The broad scope of this approach is illustrated by the synthesis of a range of such complexes LnM: LnM(hfac)3(μ2-acac-O,O,O′)3 (Ln = La, Pr, Gd; M = Cr, Fe, Ga), with approximate three-fold symmetry. The complexes have been crystallographically characterized and exhibit polymorphism for some combinations of 4f and 3d metal centers. However, an isostructural set of systems spanning several lanthanides which exhibit spontaneous resolution in the orthorhombic Sohncke space group P212121 is presented here. The electronic structure and ensuing magnetic properties have been studied by EPR spectroscopy and magnetometry. The GdFe, PrFe, and PrCr complexes exhibit ferromagnetic coupling, while GdCr exhibits antiferromagnetic coupling. GdGa exhibits slow relaxation of the magnetization in applied static fields.
Collapse
|
19
|
Bar AK, Kalita P, Singh MK, Rajaraman G, Chandrasekhar V. Low-coordinate mononuclear lanthanide complexes as molecular nanomagnets. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.03.022] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
20
|
Comba P, Daumann LJ, Klingeler R, Koo C, Riley MJ, Roberts AE, Wadepohl H, Werner J. Correlation of Structural and Magnetic Properties in a Set of Mononuclear Lanthanide Complexes. Chemistry 2018; 24:5319-5330. [PMID: 29405448 DOI: 10.1002/chem.201704822] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Indexed: 11/06/2022]
Abstract
The electronic and magnetic properties of a set of mononuclear terbium(III) and dysprosium(III) complexes with two tetradentate 1-hydroxy-pyridin-2-one (1,2-HOPO) ligands are reported. Two primary coordination geometries are observed, depending on the length of the linker between the 1,2-HOPO donor moieties and the resulting arrangements of the linker. Fine details of the magnetic circular dichroism (MCD) spectra of the dysprosium(III) complexes illustrate differences in the splitting of the J multiplets and allow for a thorough ligand field analysis. High frequency electron paramagnetic resonance (HF-EPR) studies of the terbium(III) complexes give insight into the composition of the ground states. Ab initio calculations are utilized to rationalize the experimental results and further illustrate the effect of the structural features on the electronic and magnetic properties of the different complexes.
Collapse
Affiliation(s)
- Peter Comba
- Anorganisch-Chemisches Institut, Universität Heidelberg, INF 270, 69120, Heidelberg, Germany.,Interdisziplinäres Zentrum für Wissenschaftliches Rechnen (IWR), INF 205, 69120, Heidelberg, Germany
| | - Lena J Daumann
- Fakultät für Chemie und Pharmazie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, Munich, Germany
| | - Rüdiger Klingeler
- Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120, Heidelberg, Germany.,Centre for Advanced Materials (CAM), Universität Heidelberg, INF 225, 69120, Heidelberg, Germany
| | - Changhyun Koo
- Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120, Heidelberg, Germany
| | - Mark J Riley
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Asha E Roberts
- Anorganisch-Chemisches Institut, Universität Heidelberg, INF 270, 69120, Heidelberg, Germany.,Interdisziplinäres Zentrum für Wissenschaftliches Rechnen (IWR), INF 205, 69120, Heidelberg, Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Universität Heidelberg, INF 270, 69120, Heidelberg, Germany
| | - Johannes Werner
- Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120, Heidelberg, Germany
| |
Collapse
|
21
|
Ferbinteanu M, Cimpoesu F. The Modeling in Molecular Magnetism. Struct Chem 2018. [DOI: 10.1007/978-3-319-55875-2_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
22
|
Hiller M, Krieg S, Ishikawa N, Enders M. Ligand-Field Energy Splitting in Lanthanide-Based Single-Molecule Magnets by NMR Spectroscopy. Inorg Chem 2017; 56:15285-15294. [PMID: 29200279 DOI: 10.1021/acs.inorgchem.7b02704] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A method for the experimental determination of ligand-field (LF) energy splitting in mononuclear lanthanide complexes, based purely on variable-temperature NMR spectroscopy, was developed. The application of this method in an isostructural series of anionic lanthanide bis(cyclooctatetraenide) double-decker compounds bearing large rigid substituents is demonstrated. Using the three-nuclei plot approach devised by Reilley, the isostructurality of the compound series and the identical orientation of the magnetic main axis of all Ln3+ ions in the series Tb3+ to Tm3+ are demonstrated. Measurement of the 2H NMR spectra of partially deuterated analogues of the complexes permitted determination of the axial magnetic susceptibility anisotropies χax for all five ions in the temperature range from 185 to 335 K. For this purpose, analysis of the hyperfine shifts was combined with structural models derived from density functional theory calculations. In a final step, the temperature dependence of the χax values was used for determination of the three axial LF parameters, adapting a method employed previously for phthalocyanine-based systems. The temperature dependence dictated by the LF parameters determined by this NMR-based approach is compared to the results of recently published ab initio calculations of the system, indicating reasonable agreement of both methods. For all ions except Dy3+, the NMR method determines the same mJ ground state as the calculations and the order and energies of the excited states match well. However, the sign of the magnetic anisotropy of the dysprosium complex in the temperature range evaluated here is not correctly predicted by the published calculations but can be described accurately by the NMR approach. This shows that our experimental method for determination of the LF parameters is an ideal complementation to other theoretical and experimental methods.
Collapse
Affiliation(s)
- Markus Hiller
- Institute of Inorganic Chemistry, Heidelberg University , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Saskia Krieg
- Institute of Inorganic Chemistry, Heidelberg University , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
| | - Markus Enders
- Institute of Inorganic Chemistry, Heidelberg University , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| |
Collapse
|
23
|
Bronova A, Bredow T, Glaum R, Riley MJ, Urland W. BonnMag: Computer program for ligand-field analysis off nsystems within the angular overlap model. J Comput Chem 2017; 39:176-186. [DOI: 10.1002/jcc.25096] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 10/12/2017] [Accepted: 10/16/2017] [Indexed: 01/20/2023]
Affiliation(s)
- Anna Bronova
- Institute of Inorganic Chemistry, Rheinische Friedrich-Wilhelms-Universität, Gerhard-Domagk-Straße 1; Bonn D-53121 Germany
| | - Thomas Bredow
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität, Beringstr. 4; Bonn D-53121 Germany
| | - Robert Glaum
- Institute of Inorganic Chemistry, Rheinische Friedrich-Wilhelms-Universität, Gerhard-Domagk-Straße 1; Bonn D-53121 Germany
| | - Mark J. Riley
- School of Chemistry and Molecular Biosciences; University of Queensland, Brisbane St. Lucia; QLD 4072 Australia
| | - Werner Urland
- Private Institute of Theoretical Chemical Physics, Via Dr. A. Sciarone Nr. 2; Muralto CH-6600 Switzerland
| |
Collapse
|
24
|
Perfetti M. Cantilever torque magnetometry on coordination compounds: from theory to experiments. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.08.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
25
|
Pointillart F, Cador O, Le Guennic B, Ouahab L. Uncommon lanthanide ions in purely 4f Single Molecule Magnets. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2016.12.017] [Citation(s) in RCA: 211] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
26
|
Lucaccini E, Baldoví JJ, Chelazzi L, Barra AL, Grepioni F, Costes JP, Sorace L. Electronic Structure and Magnetic Anisotropy in Lanthanoid Single-Ion Magnets with C3 Symmetry: The Ln(trenovan) Series. Inorg Chem 2017; 56:4729-4739. [DOI: 10.1021/acs.inorgchem.7b00413] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eva Lucaccini
- Department of Chemistry
“U.Schiff” and UdR INSTM, Università degli Studi di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy
| | - José J. Baldoví
- Nano-Bio Spectroscopy Group and European Theoretical Spectroscopy Facility (ETSF), Universidad del País Vasco CFM CSIC-UPV/EHU-MPC & DIPC, Avenida Tolosa 72, 20018 San Sebastián, Spain
| | - Laura Chelazzi
- Department of Chemistry “G. Ciamician”, Università degli Studi di Bologna, Via Selmi 2, 40196 Bologna, Italy
| | - Anne-Laure Barra
- LNCMI-CNRS, 25 Rue des
Martyrs, BP 166, 38042 Grenoble Cedex 9, France
| | - Fabrizia Grepioni
- Department of Chemistry “G. Ciamician”, Università degli Studi di Bologna, Via Selmi 2, 40196 Bologna, Italy
| | - Jean-Pierre Costes
- Laboratoire de Chimie de Coordination du CNRS, 205, Route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
| | - Lorenzo Sorace
- Department of Chemistry
“U.Schiff” and UdR INSTM, Università degli Studi di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy
| |
Collapse
|
27
|
Ungur L, Chibotaru LF. Ab Initio Crystal Field for Lanthanides. Chemistry 2017; 23:3708-3718. [DOI: 10.1002/chem.201605102] [Citation(s) in RCA: 189] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Liviu Ungur
- Theory of Nanomaterials Group, Department of Chemistry, and; Institute of Nanoscale Physics and Chemistry -INPAC; Katholieke Universiteit Leuven; Celestijnenlaan 200F 3001 Leuven Belgium
- Theoretical Chemistry Group; Department of Chemistry; Lund University; Getingevagen 60 22100 Lund Sweden
| | - Liviu F. Chibotaru
- Theory of Nanomaterials Group, Department of Chemistry, and; Institute of Nanoscale Physics and Chemistry -INPAC; Katholieke Universiteit Leuven; Celestijnenlaan 200F 3001 Leuven Belgium
| |
Collapse
|
28
|
Craze AR, Huang XD, Etchells I, Zheng LM, Bhadbhade MM, Marjo CE, Clegg JK, Moore EG, Avdeev M, Lindoy LF, Li F. Synthesis and characterisation of new tripodal lanthanide complexes and investigation of their optical and magnetic properties. Dalton Trans 2017; 46:12177-12184. [PMID: 28871301 DOI: 10.1039/c7dt02556d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The neutral complexes of type [EuL], [GdL] and [DyL] incorporating a heptadentate tripodal ligand were synthesized and their optical and magnetic properties have been investigated.
Collapse
Affiliation(s)
- Alexander R. Craze
- School of Science and Health
- University of Western Sydney
- Penrith
- Australia
| | - Xin-Da Huang
- State Key Laboratory of Coordination Chemistry
- Institute of Coordination Chemistry at Nanjing University
- Qixia District, Nanjing
- China
| | - Isaac Etchells
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- Brisbane St Lucia
- Australia
| | - Li-Min Zheng
- State Key Laboratory of Coordination Chemistry
- Institute of Coordination Chemistry at Nanjing University
- Qixia District, Nanjing
- China
| | | | | | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- Brisbane St Lucia
- Australia
| | - Evan G. Moore
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- Brisbane St Lucia
- Australia
| | - Maxim Avdeev
- Australian Nuclear Science and Technology Organisation
- Kirrawee DC
- Australia
| | | | - Feng Li
- School of Science and Health
- University of Western Sydney
- Penrith
- Australia
| |
Collapse
|
29
|
Vonci M, Giansiracusa MJ, Van den Heuvel W, Gable RW, Moubaraki B, Murray KS, Yu D, Mole RA, Soncini A, Boskovic C. Magnetic Excitations in Polyoxotungstate-Supported Lanthanoid Single-Molecule Magnets: An Inelastic Neutron Scattering and ab Initio Study. Inorg Chem 2016; 56:378-394. [DOI: 10.1021/acs.inorgchem.6b02312] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Michele Vonci
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| | | | | | - Robert W. Gable
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Boujemaa Moubaraki
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Keith S. Murray
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Dehong Yu
- Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia
| | - Richard A. Mole
- Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia
| | - Alessandro Soncini
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| |
Collapse
|
30
|
Bonizzoni C, Ghirri A, Bader K, van Slageren J, Perfetti M, Sorace L, Lan Y, Fuhr O, Ruben M, Affronte M. Coupling molecular spin centers to microwave planar resonators: towards integration of molecular qubits in quantum circuits. Dalton Trans 2016; 45:16596-16603. [DOI: 10.1039/c6dt01953f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Strong coupling meets coordination chemistry: hints in the design of molecular qubits in hybrid quantum circuits.
Collapse
Affiliation(s)
- C. Bonizzoni
- Dipartimento FIM
- Università di Modena e Reggio Emilia
- 411125 Modena
- Italy
- Istituto Nanoscienze - CNR
| | - A. Ghirri
- Istituto Nanoscienze - CNR
- 411125 Modena
- Italy
| | - K. Bader
- Institut für Physikalische Chemie
- Universität Stuttgart
- 70569 Stuttgart
- Germany
| | - J. van Slageren
- Institut für Physikalische Chemie
- Universität Stuttgart
- 70569 Stuttgart
- Germany
| | - M. Perfetti
- Dipartimento di Chimica “U. Schiff” and UdR INSTM
- Università di Firenze
- 50019 Sesto Fiorentino(FI)
- Italy
| | - L. Sorace
- Dipartimento di Chimica “U. Schiff” and UdR INSTM
- Università di Firenze
- 50019 Sesto Fiorentino(FI)
- Italy
| | - Y. Lan
- Institute of Nanotechnology
- Karlsruhe Institute of Technology (KIT)
- D-76344 Eggenstein-Leopoldshafen
- Germany
| | - O. Fuhr
- Institute of Nanotechnology
- Karlsruhe Institute of Technology (KIT)
- D-76344 Eggenstein-Leopoldshafen
- Germany
| | - M. Ruben
- Institute of Nanotechnology
- Karlsruhe Institute of Technology (KIT)
- D-76344 Eggenstein-Leopoldshafen
- Germany
- Institut de Physique et Chimie des Matériaux de Strasbourg
| | - M. Affronte
- Dipartimento FIM
- Università di Modena e Reggio Emilia
- 411125 Modena
- Italy
- Istituto Nanoscienze - CNR
| |
Collapse
|
31
|
Magnetic Bistability in Lanthanide-Based Molecular Systems: The Role of Anisotropy and Exchange Interactions. INCLUDING ACTINIDES 2016. [DOI: 10.1016/bs.hpcre.2016.09.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
32
|
Rechkemmer Y, Fischer JE, Marx R, Dörfel M, Neugebauer P, Horvath S, Gysler M, Brock-Nannestad T, Frey W, Reid MF, van Slageren J. Comprehensive Spectroscopic Determination of the Crystal Field Splitting in an Erbium Single-Ion Magnet. J Am Chem Soc 2015; 137:13114-20. [DOI: 10.1021/jacs.5b08344] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yvonne Rechkemmer
- Institut
für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
| | - Julia E. Fischer
- Institut
für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
| | - Raphael Marx
- Institut
für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
| | - María Dörfel
- Institut
für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
| | - Petr Neugebauer
- Institut
für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
| | - Sebastian Horvath
- Department
of Physics and Astronomy, University of Canterbury, Christchurch 8140, New Zealand
| | - Maren Gysler
- Institut
für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
| | - Theis Brock-Nannestad
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Wolfgang Frey
- Institut
für Organische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
| | - Michael F. Reid
- Department
of Physics and Astronomy, University of Canterbury, Christchurch 8140, New Zealand
| | - Joris van Slageren
- Institut
für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
| |
Collapse
|
33
|
Pedersen KS, Dreiser J, Weihe H, Sibille R, Johannesen HV, Sørensen MA, Nielsen BE, Sigrist M, Mutka H, Rols S, Bendix J, Piligkos S. Design of Single-Molecule Magnets: Insufficiency of the Anisotropy Barrier as the Sole Criterion. Inorg Chem 2015. [DOI: 10.1021/acs.inorgchem.5b01209] [Citation(s) in RCA: 161] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Kasper S. Pedersen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
- CNRS, CRPP, UPR 8641, F-33600 Pessac, France
- CNRS, ICMCB, UPR 9014, F-33600 Pessac, France
| | - Jan Dreiser
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Høgni Weihe
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Romain Sibille
- Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Heini V. Johannesen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Mikkel A. Sørensen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Bjarne E. Nielsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Marc Sigrist
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
- Institut Laue-Langevin, Grenoble, France
| | | | | | - Jesper Bendix
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Stergios Piligkos
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| |
Collapse
|
34
|
Dreiser J. Molecular lanthanide single-ion magnets: from bulk to submonolayers. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:183203. [PMID: 25893740 DOI: 10.1088/0953-8984/27/18/183203] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Single-ion magnets (SIMs) are mononuclear molecular complexes exhibiting slow relaxation of magnetization. They are currently attracting a lot of interest because of potential applications in spintronics and quantum information processing. However, exploiting SIMs in, e.g. molecule-inorganic hybrid devices requires a fundamental understanding of the effects of molecule-substrate interactions on the SIM magnetic properties. In this review the properties of lanthanide SIMs in the bulk crystalline phase and deposited on surfaces in the (sub)monolayer regime are discussed. As a starting point trivalent lanthanide ions in a ligand field will be described, and the challenges in characterizing the ligand field are illustrated with a focus on several spectroscopic techniques which are able to give direct information on the ligand-field split energy levels. Moreover, the dominant mechanisms of magnetization relaxation in the bulk phase are discussed followed by an overview of SIMs relevant for surface deposition. Further, a short introduction will be given on x-ray absorption spectroscopy, x-ray magnetic circular dichroism and scanning tunneling microscopy. Finally, the recent experiments on surface-deposited SIMs will be reviewed, along with a discussion of future perspectives.
Collapse
Affiliation(s)
- J Dreiser
- Ecole Polytechnique Fédérale de Lausanne, ICMP, Station 3, CH-1015 Lausanne, Switzerland. Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland
| |
Collapse
|
35
|
Perfetti M, Lucaccini E, Sorace L, Costes JP, Sessoli R. Determination of magnetic anisotropy in the LnTRENSAL complexes (Ln = Tb, Dy, Er) by torque magnetometry. Inorg Chem 2015; 54:3090-2. [PMID: 25756362 DOI: 10.1021/acs.inorgchem.5b00288] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report here a study about the magnetic anisotropy of the LnTRENSAL complexes (Ln = Tb, Dy, Er) performed by using cantilever torque magnetometry and electron paramagnetic resonance. For all of the compounds, we extracted a set of crystal-field parameters to obtain the energy-level splitting of the ground-state multiplet.
Collapse
Affiliation(s)
- Mauro Perfetti
- †Dipartimento di Chimica "Ugo Schiff" and UdR INSTM, Università degli Studi di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Eva Lucaccini
- †Dipartimento di Chimica "Ugo Schiff" and UdR INSTM, Università degli Studi di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Lorenzo Sorace
- †Dipartimento di Chimica "Ugo Schiff" and UdR INSTM, Università degli Studi di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Jean Pierre Costes
- ‡Laboratoire de Chimie de Coordination 205 route de Narbonne, 31077 Toulouse Cedex 4, France
| | - Roberta Sessoli
- †Dipartimento di Chimica "Ugo Schiff" and UdR INSTM, Università degli Studi di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| |
Collapse
|
36
|
Lucaccini E, Sorace L, Perfetti M, Costes JP, Sessoli R. Beyond the anisotropy barrier: slow relaxation of the magnetization in both easy-axis and easy-plane Ln(trensal) complexes. Chem Commun (Camb) 2014; 50:1648-51. [DOI: 10.1039/c3cc48866g] [Citation(s) in RCA: 179] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The slow relaxation of the magnetization of lanthanide SMMs cannot be directly associated with the nature of magnetic anisotropy.
Collapse
Affiliation(s)
- Eva Lucaccini
- Dipartimento di Chimica “U. Schiff” and UdR INSTM
- Universitá di Firenze
- Sesto Fiorentino(FI), Italy
| | - Lorenzo Sorace
- Dipartimento di Chimica “U. Schiff” and UdR INSTM
- Universitá di Firenze
- Sesto Fiorentino(FI), Italy
| | - Mauro Perfetti
- Dipartimento di Chimica “U. Schiff” and UdR INSTM
- Universitá di Firenze
- Sesto Fiorentino(FI), Italy
| | | | - Roberta Sessoli
- Dipartimento di Chimica “U. Schiff” and UdR INSTM
- Universitá di Firenze
- Sesto Fiorentino(FI), Italy
| |
Collapse
|
37
|
Pedersen KS, Ungur L, Sigrist M, Sundt A, Schau-Magnussen M, Vieru V, Mutka H, Rols S, Weihe H, Waldmann O, Chibotaru LF, Bendix J, Dreiser J. Modifying the properties of 4f single-ion magnets by peripheral ligand functionalisation. Chem Sci 2014. [DOI: 10.1039/c3sc53044b] [Citation(s) in RCA: 145] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Three Er(iii) single-ion magnets which differ in the peripheral ligand sphere but exhibit similar first coordination spheres show profoundly different inelastic neutron scattering spectra and magnetic properties.
Collapse
Affiliation(s)
- Kasper S. Pedersen
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen, Denmark
| | - Liviu Ungur
- Theory of Nanomaterials Group
- Katholieke Universiteit Leuven
- 3001 Leuven, Belgium
| | - Marc Sigrist
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen, Denmark
- Institut Laue-Langevin
- 38042 Grenoble Cedex 9, France
| | - Alexander Sundt
- Physikalisches Institut
- Universität Freiburg
- 79104 Freiburg, Germany
| | | | - Veacheslav Vieru
- Theory of Nanomaterials Group
- Katholieke Universiteit Leuven
- 3001 Leuven, Belgium
| | - Hannu Mutka
- Institut Laue-Langevin
- 38042 Grenoble Cedex 9, France
| | - Stephane Rols
- Institut Laue-Langevin
- 38042 Grenoble Cedex 9, France
| | - Høgni Weihe
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen, Denmark
| | - Oliver Waldmann
- Physikalisches Institut
- Universität Freiburg
- 79104 Freiburg, Germany
| | - Liviu F. Chibotaru
- Theory of Nanomaterials Group
- Katholieke Universiteit Leuven
- 3001 Leuven, Belgium
| | - Jesper Bendix
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen, Denmark
| | - Jan Dreiser
- Ecole Polytechnique Fédérale de Lausanne
- Institute of Condensed Matter Physics
- 1015 Lausanne and Swiss Light Source
- Paul Scherrer Institut
- , Switzerland
| |
Collapse
|
38
|
Marx R, Moro F, Dörfel M, Ungur L, Waters M, Jiang SD, Orlita M, Taylor J, Frey W, Chibotaru LF, van Slageren J. Spectroscopic determination of crystal field splittings in lanthanide double deckers. Chem Sci 2014. [DOI: 10.1039/c4sc00751d] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
|
39
|
Sorace L, Benelli C, Gatteschi D. Lanthanides in molecular magnetism: old tools in a new field. Chem Soc Rev 2011; 40:3092-104. [DOI: 10.1039/c0cs00185f] [Citation(s) in RCA: 906] [Impact Index Per Article: 69.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
40
|
Chakraborty J, Thakurta S, Pilet G, Ziessel RF, Charbonnière LJ, Mitra S. Syntheses, Crystal Structures and Photophysical Properties of Two Doubly μ-Phenoxo-Bridged LnIII(Ln = Pr, Nd) Homodinuclear Schiff Base Complexes. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900251] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
41
|
Masaki ME, Paul D, Nakamura R, Kataoka Y, Shinoda S, Tsukube H. Chiral tripode approach toward multiple anion sensing with lanthanide complexes. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.01.061] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
42
|
Experimental and Theoretical Approaches Toward Anion-Responsive Tripod–Lanthanide Complexes: Mixed-Donor Ligand Effects on Lanthanide Complexation and Luminescence Sensing Profiles. Chemistry 2008; 14:5258-66. [DOI: 10.1002/chem.200701898] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
43
|
YU Q, ZHOU X, LIU M, CHEN J, ZHOU Z, YIN X, CAI Y. Syntheses, characterization, and luminescence of two lanthanide complexes [Ln2(acetate)6(H2O)4]·4H2O (Ln=Tb(1), Sm(2)). J RARE EARTH 2008. [DOI: 10.1016/s1002-0721(08)60061-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
44
|
Kataoka Y, Paul D, Miyake H, Shinoda S, Tsukube H. A Cl? anion-responsive luminescent Eu3+ complex with a chiral tripod: ligand substituent effects on ternary complex stoichiometry and anion sensing selectivity. Dalton Trans 2007:2784-91. [PMID: 17592595 DOI: 10.1039/b703944a] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new series of N3,O-mixed donor tripods was prepared for luminescent Eu3+ complexes, in which the soft quinoline nitrogen, tertiary amine nitrogen, and hard amide oxygen donors were cooperatively involved. The mixed donor tripods formed more stable 1 : 1 complexes with Eu(NO3)3, La(NO3)3 and Tb(NO3)3 than the corresponding N4 donor tripods, and their Eu3+ complexes particularly exhibited anion-responsive luminescence properties. NMR, UV, and luminescence spectroscopic characterizations revealed that -CH3 substitution on the tripod skeleton remarkably altered the preferred stoichiometry of the "tripod-Eu3+-anion" ternary complex and gave anion-dependent europium luminescence. Although the disubstituted tripod preferred to form non-luminescent 2 : 1 (tripod : Eu3+) complexes with Eu(NO3)3 and other salts, it formed a luminescent 1 : 1 complex with EuCl3. Thus, this type of tripod offered Cl- anion-selective luminescence enhancement that was easily observed by the naked eye.
Collapse
Affiliation(s)
- Yumiko Kataoka
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Osaka 558-8585, Japan
| | | | | | | | | |
Collapse
|
45
|
Comby S, Bünzli JCG. Chapter 235 Lanthanide Near-Infrared Luminescence in Molecular Probes and Devices. HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS 2007. [DOI: 10.1016/s0168-1273(07)37035-9] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
|
46
|
Salehzadeh S, Javarsineh SA, Keypour H. Metal complexes of a new potentially heptadentate(N7) tripodal Schiff base ligand. Synthesis, NMR studies and ab initio calculations. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2005.09.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
47
|
Salehzadeh S, Nouri SM, Keypour H, Bagherzadeh M. Synthesis of gadolinium(III) and samarium(III) complexes of new potentially heptadentate (N4O3) tripodal Schiff base ligands, and a theoretical study. Polyhedron 2005. [DOI: 10.1016/j.poly.2005.03.099] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
48
|
|