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Magnetochemistry
Special Issues
Magnetic Relaxation in Metal Complexes
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Magnetic Relaxation in Metal Complexes

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Molecular Magnetism".

Deadline for manuscript submissions: closed (15 March 2023) | Viewed by 5629

Special Issue Editors

Prof. Dr. Matilde Fondo

E-Mail Website
Guest Editor
Department of Inorganic Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
Interests: lanthanoid complexes; single molecule magnets; luminescent materials
Dr. Julio Corredoira-Vázquez

E-Mail Website
Guest Editor
Department of Inorganic Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
Interests: lanthanoid complexes; single molecule magnets; luminescent thermometry

Special Issue Information

Dear Colleagues,

The study of magnetic relaxation in molecular materials has led to important discoveries, among which molecular magnets hold a prominent place. Interest in these magnets is stimulated by a growing demand for higher density, and higher-speed data storage in new and emerging technologies. Despite significant advances in this recent field, there is still a need to improve the properties of these magnets for their potencial applications. Therefore, this Special Issue of Magnetochemistry aims to cover the most recent advances, both theoretical and experimental, in the field of magnetic relaxation in metal complexes.

Prof. Dr. Matilde Fondo
Dr. Julio Corredoira-Vázquez
Guest Editors

Manuscript Submission Information

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Keywords

  • molecule-based magnets
  • single-molecule magnets
  • modelling and theory
  • exchange and magnetic interaction
  • spintronics

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Published Papers (3 papers)

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Research

14 pages, 2891 KiB  
Article
Slow Magnetic Relaxation and Luminescence Properties in Tetra β-Diketonate Lanthanide(III) Complexes
by Saskia Speed, Ànnia Tubau, Ramon Vicente, Eva Castro and Mercè Font-Bardia
Magnetochemistry 2023, 9(5), 131; https://doi.org/10.3390/magnetochemistry9050131 - 16 May 2023
Cited by 2 | Viewed by 1573
Abstract
The reaction of [Ln(btfa)3(H2O)2] (btfa− = 4,4,4-trifluoro-1-phenyl-1,3-butanedionate) with additional 4,4,4-trifluoro-1-phenyl-1,3-butanedione (Hbtfa) and acridine (Acr) in ethanol allows the isolation of the mononuclear compounds HAcr[Nd(btfa)4]·EtOH, (1) and HAcr[Ln(btfa)4], Ln = Dy [...] Read more.
The reaction of [Ln(btfa)3(H2O)2] (btfa− = 4,4,4-trifluoro-1-phenyl-1,3-butanedionate) with additional 4,4,4-trifluoro-1-phenyl-1,3-butanedione (Hbtfa) and acridine (Acr) in ethanol allows the isolation of the mononuclear compounds HAcr[Nd(btfa)4]·EtOH, (1) and HAcr[Ln(btfa)4], Ln = Dy (2) and Yb (3); HAcr+ = acridinium cation. Magnetic measurements indicate that complexes 1–3 show field-induced single-ion magnet behavior with anisotropy energy barriers and preexponential factors of Ueff = 20.7 cm−1, τ0 = 24.5 × 10−8 s; Ueff = 40.5 cm−1, τ0 = 8.6 × 10−10 s and Ueff = 22.7 cm−1, τ0 = 8.4 × 10−8 s, for 1–3 respectively. The solid-state luminescence emission in the NIR region shows efficient energy transfer from the 4,4,4-trifluoro-1-phenyl-1,3-butanedionate ligands to the central Ln3+ ion in the case of compounds 1 and 3. Full article
(This article belongs to the Special Issue Magnetic Relaxation in Metal Complexes)
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11 pages, 3292 KiB  
Article
Zero-Field Slow Magnetic Relaxation in Binuclear Dy Acetylacetonate Complex with Pyridine-N-Oxide
by Valeriya P. Shtefanets, Gennady V. Shilov, Denis V. Korchagin, Elena A. Yureva, Alexei I. Dmitriev, Mikhail V. Zhidkov, Roman B. Morgunov, Nataliya A. Sanina and Sergey M. Aldoshin
Magnetochemistry 2023, 9(4), 105; https://doi.org/10.3390/magnetochemistry9040105 - 12 Apr 2023
Viewed by 1884
Abstract
A new complex [Dy(C5H7O2)3(C5H5NO)]2·2CHCl3 (1) has been synthesized by the reaction of pyridine-N-oxide with dysprosium (III) acetylacetonate in an n-heptane/chloroform mixture (1/20). X-ray data show that [...] Read more.
A new complex [Dy(C5H7O2)3(C5H5NO)]2·2CHCl3 (1) has been synthesized by the reaction of pyridine-N-oxide with dysprosium (III) acetylacetonate in an n-heptane/chloroform mixture (1/20). X-ray data show that each dysprosium atom is chelate-like coordinated by three acetylacetonate ligands and the oxygen atom from two bridging molecules of pyridine-N-oxide, which unite the dysprosium atoms into a binuclear complex. Static (constant current) and dynamic (alternating current) investigations and ab initio calculations of the magnetic properties of complex 1 were performed. The complex was shown to exhibit a frequency maximum under alternating current. At temperatures above 10 K, the maximum shifts to a higher frequency, which is characteristic of SMM behavior. It is established that the dependence of ln(τ) on 1/T for the relaxation process is nonlinear, which indicates the presence of Raman relaxation mechanisms, along with the Orbach mechanism. Full article
(This article belongs to the Special Issue Magnetic Relaxation in Metal Complexes)
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Graphical abstract

11 pages, 7672 KiB  
Article
A DyIII Complex of a Pentadentate Schiff Base with Field-Induced Single-Ion Magnet Behaviour
by Julio Corredoira-Vázquez, Paula Oreiro-Martínez, Ana M. García-Deibe, Jesús Sanmartín-Matalobos and Matilde Fondo
Magnetochemistry 2023, 9(3), 62; https://doi.org/10.3390/magnetochemistry9030062 - 23 Feb 2023
Cited by 4 | Viewed by 1549
Abstract
The influence of the solvent in the reaction of dysprosium(III) chloride hydrate with the N3O2 ligand H2L (2,6-bis(2-hydroxyphenyliminomethyl)pyridine) was studied To this end, the new mononuclear chloride complex [Dy(L)Cl(H2O)2] (1) was isolated [...] Read more.
The influence of the solvent in the reaction of dysprosium(III) chloride hydrate with the N3O2 ligand H2L (2,6-bis(2-hydroxyphenyliminomethyl)pyridine) was studied To this end, the new mononuclear chloride complex [Dy(L)Cl(H2O)2] (1) was isolated in absolute ethanol as solvent, without any evidence of the hydrolysis of the ligand. This clearly contrasts with previous results, where a similar reaction in methanol proceeds with the partial hydrolysis of the Schiff base, and the formation of a new hemiacetal donor to yield [Dy(HL’)2)][Dy(L)(Cl2)] (H2L’ = (6-(2-hydroxyphenyliminomethyl)-2-methoxyhydroxymethyl)pyridine). The single crystal X-ray structure of the chloride complex 1 shows that the DyIII ion is octacoordinated in a highly distorted N3O4Cl environment between triangular dodecahedral and biaugmented trigonal prisms. The full magnetic characterisation of 1 shows that it presents field-induced single ion magnet behaviour, with a thermal energy barrier Ueff of 113.5 K, which is the highest among dysprosium complexes derived from H2L. Full article
(This article belongs to the Special Issue Magnetic Relaxation in Metal Complexes)
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