Special Issue "Lanthanide Single-Molecule Magnets"

A special issue of Inorganics (ISSN 2304-6740).

Deadline for manuscript submissions: 31 January 2022.

Special Issue Editor

Dr. Akseli Mansikkamäki
E-Mail Website
Guest Editor
NMR Research Unit, University of Oulu, P.O. Box 8000, FI-90014 Oulu, Finland
Interests: molecular magnetism; quantum chemistry; theoretical chemistry; organometallic chemistry; main-group chemistry; actinide chemistry; spin dynamics; paramagnetic NMR; pseudospin Hamiltonians

Special Issue Information

Dear Colleagues,

Single-molecule magnets (SMMs) are molecular compounds capable of retaining a specific direction of magnetization in the absence of external magnetic fields. They have possible applications as molecular-scale data storage devices, quantum bits in quantum computing, and as possible microscopic components of spintronic devices. Most of the recent milestones in the drive toward SMMs capable of functioning at ambient temperatures can be attributed to coordination complexes of lanthanide ions. The discovery of a dysprosium metallocene SMM functioning at liquid-nitrogen temperature in 2018 sets the current state-of-the-art in the field. Since then, many advances have been made in synthetic approaches, characterization methods, and theoretical models, and new high-temperature SMMs will most likely emerge in the future. This Special Issue aims to collect research and review contributions focusing on the current efforts toward lanthanide SMMs with higher operational temperatures and improved magnetic functionality. An important feature of SMM research is the synergistic relationship between practical synthetic work, experimental characterization, and quantum-chemical calculations; thus, we invite you to contribute your research or review articles focusing on any aspect of the research on lanthanide SMMs.

Dr. Akseli Mansikkamäki
Guest Editor

Manuscript Submission Information

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Keywords

  • Lanthanides
  • Single-molecule magnets
  • Coordination chemistry
  • Organometallic chemistry
  • Molecular magnetism
  • Magnetochemistry
  • Magnetic characterization
  • Magnetic anisotropy
  • Spin-lattice relaxation
  • Molecular spintronics
  • Multifunctional materials
  • Exchange interaction

Published Papers (3 papers)

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Research

Article
Switching the Local Symmetry from D5h to D4h for Single-Molecule Magnets by Non-Coordinating Solvents
Inorganics 2021, 9(8), 64; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9080064 - 16 Aug 2021
Viewed by 536
Abstract
A solvent effect towards the performance of two single-molecule magnets (SMMs) was observed. The tetrahydrofuran and toluene solvents can switch the equatorial coordinated 4-Phenylpyridine (4-PhPy) molecules from five to four, respectively, in [Dy(OtBu)2(4-PhPy)5]BPh41 and Na{[Dy(O [...] Read more.
A solvent effect towards the performance of two single-molecule magnets (SMMs) was observed. The tetrahydrofuran and toluene solvents can switch the equatorial coordinated 4-Phenylpyridine (4-PhPy) molecules from five to four, respectively, in [Dy(OtBu)2(4-PhPy)5]BPh41 and Na{[Dy(OtBu)2(4-PhPy)4][BPh4]2}∙2thf∙hex 2. This alternation significantly changes the local coordination symmetry of the Dy(III) center from D5h to D4h for 1 and 2, seperately. Magnetic studies show that the magnetic anisotropy energy barrier of 2 is higher than that of 1, while the relation of blocking temperature is just on the contrary due to the symmetry effect. The calculations of the electrostatic potential successfully explained the driving force of solvents for the molecular structure change, confirming the feasibility of adjusting the performance of SMMs via diverse solvents. Full article
(This article belongs to the Special Issue Lanthanide Single-Molecule Magnets)
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Article
A Dy(III) Fluorescent Single-Molecule Magnet Based on a Rhodamine 6G Ligand
Inorganics 2021, 9(7), 51; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9070051 - 29 Jun 2021
Viewed by 584
Abstract
The complexes of lanthanide metals, especially dysprosium, can generally exhibit excellent magnetic properties. By means of modifying ligands, dual functions or even multi-functions can be achieved. Here, we synthesized an eight-coordinate Dy(III) complex 1, [Dy(HL-o)2(MeOH)2](ClO4)3 [...] Read more.
The complexes of lanthanide metals, especially dysprosium, can generally exhibit excellent magnetic properties. By means of modifying ligands, dual functions or even multi-functions can be achieved. Here, we synthesized an eight-coordinate Dy(III) complex 1, [Dy(HL-o)2(MeOH)2](ClO4)3·4.5MeOH, which is single-molecule magnet (SMM), and the introduction of the rhodamine 6G chromophore in the ring-opened ligand HL-o realizes ligand-centered fluorescence in addition to SMM. Magnetic measurements and ab initio calculations indicate that the magnetic relaxation for complex 1 should be due to the Raman relaxation process. Studies on magneto-structural correlationship of the rhodamine salicylaldehyde hydrazone Dy(III) complexes show that the calculated energy of the first Kramers Doublet (EKD1) is basically related to the Ophenoxy-Dy-Ophenoxy bond angle, i.e., the larger Ophenoxy-Dy-Ophenoxy bond angle corresponds to a larger EKD1. Full article
(This article belongs to the Special Issue Lanthanide Single-Molecule Magnets)
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Article
Chiral or Luminescent Lanthanide Single-Molecule Magnets Involving Bridging Redox Active Triad Ligand
Inorganics 2021, 9(7), 50; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9070050 - 23 Jun 2021
Viewed by 653
Abstract
The reactions between the bis(1,10-phenantro[5,6-b])tetrathiafulvalene triad (L) and the metallo-precursors Yb(hfac)3(H2O)2 (hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato anion) and Dy(facam)3 (facam = 3-trifluoro-acetyl-(+)-camphorato anion) lead to the formation of two dinuclear complexes of formula [Yb2(hfac)6 [...] Read more.
The reactions between the bis(1,10-phenantro[5,6-b])tetrathiafulvalene triad (L) and the metallo-precursors Yb(hfac)3(H2O)2 (hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato anion) and Dy(facam)3 (facam = 3-trifluoro-acetyl-(+)-camphorato anion) lead to the formation of two dinuclear complexes of formula [Yb2(hfac)6(L)]·2(C7H16) ((1)·2(C7H16)) and [Dy2((+)facam)6(L)]·2(C6H14) ((2)·2(C6H14)). The X-ray structures reveal that the L triad bridges two terminal Yb(hfac)3 or Dy(facam)3 units. (1)·2(C7H16) behaved as a near infrared YbIII centered emitter and a field-induced Single-Molecule Magnet (SMM) while (2)·2(C6H14) displayed SMM behavior in both zero- and in-dc field. The magnetization mainly relaxes through a Raman process for both complexes under an optimal applied magnetic field. Full article
(This article belongs to the Special Issue Lanthanide Single-Molecule Magnets)
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