Special Issue "A Themed Issue of Functional Molecule-based Magnets: Dedicated to Professor Masahiro Yamashita on the Occasion of his 65th Birthday"

A special issue of Magnetochemistry (ISSN 2312-7481).

Deadline for manuscript submissions: 30 June 2019

Special Issue Editor

Guest Editor
Dr. Keiichi Katoh

Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
Website | E-Mail
Interests: molecule-based magnets; multifunctional molecules; molecule-based spintronic materials; single molecule chemistry and physics; spinterface science

Special Issue Information

Dear Colleagues,

Since research on molecule-based magnetic materials was systematized in the 1980s, the field has expanded greatly. In Magnetochemistry, a Special Issue focusing on molecule-based magnetic substances will be published in honor of Professor Masahiro Yamashita's 65th birthday.

Masahiro Yamashita received his D.Sc. in 1982 from Kyushu University. Then, he joined the Institute for Molecular Science (IMS). In 1985, he was appointed Assistant Professor at Kyushu University. In 1989, he was appointed Associate Professor at Nagoya University. He was a full Professor at Tokyo Metropolitan University from 2000 to 2004. He is now a full Professor in Tohoku University. He has been honored with the Inoue Scientific Award (2002), the Chemical Society of Japan Award for Creative Work (2005), and the Award of Japan Society of Coordination Chemistry (2014). He is now an Associate Member of the Science Council of Japan. He is also Associate Editor of Dalton Transactions, as well as a Fellow of the Royal Society of Chemistry (FRSC).

The field of molecule-based magnetic materials has developed across many fields, such as chemistry, physics, material chemistry, and applied physics, and the use of the various functionalities of these molecule-based magnetic substances strongly influences research on spin-based devices. Molecule-based magnetic materials include a wide variety of molecular compounds, such as organic radicals, transition metal complexes, and rare earth complexes, and exhibit magnetic properties not only as single molecules, but also in various forms, such as crystals, liquid crystals, thin films, and macromolecular polymers. Research on light, magnetic field, and electric field responsive molecule-based magnetic materials is still vigorous, and the development of multiferroic, spintronic, and molecular-based QC materials is expected. At the same time, research on the application of these materials as spin-based memories and devices by detecting and controlling the spin state at the molecular level, known as the spinterface, has been a hot topic in recent years. In other words, it is possible to combine the ideas and concepts from the study of spintronics into the development of molecular spin systems and to realize nanospintronic devices by using carefully designed molecule-based magnets.

For this Special Issue of Magnetochemistry, we are gathering contributions from various areas of functional molecule-based magnets. I would like to cordially invite you to submit an article to this Special Issue. Original research articles, perspectives, reviews, and personal accounts that fit into one of the key topics listed below are welcome. Furthermore, this Special Issue is in honor of Professor Masahiro Yamashita, who has contributed greatly to this field, on the occasion of his 65th birthday.

Dr. Keiichi Katoh
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Magnetochemistry is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 350 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Molecule-based magnets
  • Multifunctional molecule-based magnets
  • Switchable molecule-based magnets
  • Molecule-based spintronic materials
  • Spin control and detection system
  • Spinterface science
  • Molecular spintronics
  • Molecular spin QC vicinity phenomenon
  • Theoretical approach of multifunctional molecule-based magnets

Published Papers (7 papers)

View options order results:
result details:
Displaying articles 1-7
Export citation of selected articles as:

Editorial

Jump to: Research

Open AccessEditorial
Laudation: In Celebration of Masahiro Yamashita’s 65th Birthday
Magnetochemistry 2019, 5(2), 25; https://doi.org/10.3390/magnetochemistry5020025
Received: 3 April 2019 / Accepted: 3 April 2019 / Published: 10 April 2019
PDF Full-text (138 KB) | HTML Full-text | XML Full-text
Abstract
Professor Masahiro Yamashita at the Tohoku University, Japan, celebrates his 65th birthday in 2019 [...] Full article

Research

Jump to: Editorial

Open AccessFeature PaperArticle
A Novel Family of Triangular CoII2LnIII and CoII2YIII Clusters by the Employment of Di-2-Pyridyl Ketone
Magnetochemistry 2019, 5(2), 35; https://doi.org/10.3390/magnetochemistry5020035
Received: 31 March 2019 / Revised: 22 May 2019 / Accepted: 24 May 2019 / Published: 4 June 2019
PDF Full-text (1223 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The synthesis, structural characterization and magnetic study of novel CoII/4f and CoII/YIII clusters are described. In particular, the initial employment of di-2-pyridyl ketone, (py)2CO, in mixed metal Co/4f chemistry, provided access to four triangular clusters, [Co [...] Read more.
The synthesis, structural characterization and magnetic study of novel CoII/4f and CoII/YIII clusters are described. In particular, the initial employment of di-2-pyridyl ketone, (py)2CO, in mixed metal Co/4f chemistry, provided access to four triangular clusters, [CoII2MIII{(py)2C(OEt)(O)}4(NO3)(H2O)]2[M(NO3)5](ClO4)2 (M = Gd, 1; Dy, 2; Tb, 3; Y, 4), where (py)2C(OEt)(O) is the monoanion of the hemiketal form of (py)2CO. Clusters 14 are the first reported Co/4f (13) and Co/Y (4) species bearing (py)2CO or its derivatives, despite the fact that over 200 metal clusters bearing this ligand have been reported so far. Variable-temperature, solid-state dc and ac magnetic susceptibility studies were carried out on 14 and revealed the presence of weak ferromagnetic exchange interactions between the metal ions (JCo-Co = +1.3 and +0.40 cm−1 in 1 and 4, respectively; JCo-Gd = +0.09 cm−1 in 1). The ac susceptibility studies on 2 revealed nonzero, weak out-of-phase (χ’’M) signals below ~5 K. Full article
Figures

Graphical abstract

Open AccessFeature PaperArticle
Chloranilato-Based Layered Ferrimagnets with Solvent-Dependent Ordering Temperatures
Magnetochemistry 2019, 5(2), 34; https://doi.org/10.3390/magnetochemistry5020034
Received: 2 May 2019 / Revised: 25 May 2019 / Accepted: 28 May 2019 / Published: 4 June 2019
PDF Full-text (4015 KB) | HTML Full-text | XML Full-text
Abstract
We report the synthesis and the characterization of six new heterometallic chloranilato-based ferrimagnets formulated as (NBu4)[MnCr(C6O4Cl2)3]·nG with n = 1 for G = C6H5Cl (1), C6 [...] Read more.
We report the synthesis and the characterization of six new heterometallic chloranilato-based ferrimagnets formulated as (NBu4)[MnCr(C6O4Cl2)3]·nG with n = 1 for G = C6H5Cl (1), C6H5I (3), and C6H5CH3 (4); n = 1.5 for G = C6H5Br (2) and n = 2 for G = C6H5CN (5) and C6H5NO2 (6); (C6O4Cl2)2− = 1,3-dichloro,2,5-dihydroxy-1,4-benzoquinone dianion. The six compounds are isostructural and show hexagonal honeycomb layers of the type [MnCr(C6O4Cl2)3] alternating with layers containing the NBu4+ cations. The hexagons are formed by alternating Mn(II) and Cr(III) connected by bridging bis-bidentate chloranilato ligands. The benzene derivative solvent molecules are located in the hexagonal channels (formed by the eclipsed packing of the honeycomb layers) showing π-π interactions with the anilato rings. The six compounds behave as ferrimagnets with ordering temperatures in the range 9.8–11.2 K that can be finely tuned by the donor character of the benzene ring and by the number of solvent molecules inserted in the hexagonal channels. The larger the electron density on the aromatic ring and the larger the number of solvent molecules are, the higher Tc is. The only exception is provided by toluene, where the formation of H-bonds might be at the origin of weaker π-π interactions observed in this compound. Full article
Figures

Graphical abstract

Open AccessArticle
How to Quench Ferromagnetic Ordering in a CN-Bridged Ni(II)-Nb(IV) Molecular Magnet? A Combined High-Pressure Single-Crystal X-Ray Diffraction and Magnetic Study
Magnetochemistry 2019, 5(2), 33; https://doi.org/10.3390/magnetochemistry5020033
Received: 12 April 2019 / Revised: 25 May 2019 / Accepted: 28 May 2019 / Published: 1 June 2019
PDF Full-text (5855 KB) | HTML Full-text | XML Full-text
Abstract
High-pressure (HP) structural and magnetic properties of a magnetic coordination polymer {[NiII(pyrazole)4]2[NbIV(CN)8]·4H2O}n (Ni2Nb) are presented, discussed and compared with its two previously reported analogs {[MnII(pyrazole)4 [...] Read more.
High-pressure (HP) structural and magnetic properties of a magnetic coordination polymer {[NiII(pyrazole)4]2[NbIV(CN)8]·4H2O}n (Ni2Nb) are presented, discussed and compared with its two previously reported analogs {[MnII(pyrazole)4]2[NbIV(CN)8]·4H2O}n (Mn2Nb) and {[FeII(pyrazole)4]2[NbIV(CN)8]·4H2O}n (Fe2Nb). Ni2Nb shows a significant decrease of the long-range ferromagnetic ordering under high pressure when compared to Mn2Nb, where the pressure enhances the Tc (magnetic ordering temperature), or to Fe2Nb exhibiting a pressure-induced spin crossover. The different HP magnetic responses of the three compounds were rationalized and correlated with the structural models as determined by single-crystal X-ray diffraction. Full article
Figures

Graphical abstract

Open AccessArticle
Series of Chloranilate-Bridged Dinuclear Lanthanide Complexes: Kramers Systems Showing Field-Induced Slow Magnetic Relaxation
Magnetochemistry 2019, 5(2), 30; https://doi.org/10.3390/magnetochemistry5020030
Received: 26 March 2019 / Revised: 11 April 2019 / Accepted: 18 April 2019 / Published: 2 May 2019
PDF Full-text (2489 KB) | HTML Full-text | XML Full-text | Supplementary Files
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 ( [...] Read more.
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 15 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. Full article
Figures

Graphical abstract

Open AccessArticle
Correlation between Slow Magnetic Relaxations and Molecular Structures of Dy(III) Complexes with N5O4 Nona-Coordination
Magnetochemistry 2019, 5(2), 27; https://doi.org/10.3390/magnetochemistry5020027
Received: 30 March 2019 / Revised: 10 April 2019 / Accepted: 13 April 2019 / Published: 18 April 2019
PDF Full-text (3714 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
A series of Dy(III) mononuclear complexes [DyA2L]+ (L denotes Schiff base N5 ligand that occupies equatorial positions and A denotes bidentate anionic O-donor ligands such as NO3 (1), AcO (2), [...] Read more.
A series of Dy(III) mononuclear complexes [DyA2L]+ (L denotes Schiff base N5 ligand that occupies equatorial positions and A denotes bidentate anionic O-donor ligands such as NO3 (1), AcO (2), and acac (3)) were synthesized to investigate the correlation between the slow magnetic relaxation phenomena and the coordination structures around Dy(III). The Dy(III) ion in each complex is in a nona-coordination with the anionic O-donor ligand occupying up- and down-side positions of the N5 equatorial plane. 2 and 3 show slow magnetic relaxation phenomena under a zero bias-field condition, and all complexes showed slow magnetic relaxation under the applied 1000-Oe bias-field conditions. Arrhenius analyses revealed that the ΔE/kB, the barrier height for magnetization flipping, increases in this order, with the values of 24.1(6), 85(3), and 140(15) K. The effects of the exchanging axial ligands on the magnetic anisotropy were discussed together with the DFT calculations. Full article
Figures

Figure 1

Open AccessArticle
Pressure Effects with Incorporated Particle Size Dependency in Graphene Oxide Layers through Observing Spin Crossover Temperature
Magnetochemistry 2019, 5(2), 26; https://doi.org/10.3390/magnetochemistry5020026
Received: 23 March 2019 / Revised: 8 April 2019 / Accepted: 8 April 2019 / Published: 11 April 2019
PDF Full-text (2216 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
This research highlights the pressure effects with the particle size dependency incorporated in two-dimensional graphene oxide (GO)/reduced graphene oxide (rGO). GO and rGO composites employing nanorods (NRs) of type [Fe(Htrz)2(trz)](BF4) have been prepared, and their pressure effects in the [...] Read more.
This research highlights the pressure effects with the particle size dependency incorporated in two-dimensional graphene oxide (GO)/reduced graphene oxide (rGO). GO and rGO composites employing nanorods (NRs) of type [Fe(Htrz)2(trz)](BF4) have been prepared, and their pressure effects in the interlayer spaces through observing the changes of the spin crossover (SCO) temperature (T1/2) have been discussed. The composites show the decrease of interlayer spaces from 8.7 Å to 3.5 Å that is associated with GO to rGO transformation. The shorter interlayer spaces were induced by pressure effects, resulting in the increment of T1/2 from 357 K to 364 K. The pressure effects in the interlayers spaces estimated from the T1/2 value correspond to 24 MPa in pristine [Fe(Htrz)2(trz)](BF4) NRs under hydrostatic pressure. The pressure observed in the composites incorporating NRs (30 × 200 nm) is smaller than that observed in the composite incorporating nanoparticles (NPs) (30 nm). These results clearly demonstrated that the incorporated particle size and shape influenced the pressure effects between the GO/rGO layer. Full article
Figures

Figure 1

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

1. Title: Synthesis and Characterization of New CoII/LnIII Single Molecule Magnets with the Employment of Di-2-Pyridyl Ketone
* Constantina Papatriantafyllopoulou
Magnetochemistry EISSN 2312-7481 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top