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Magnetic Coordination Compounds and More... a Long and Successful Story:...
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Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret

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

Deadline for manuscript submissions: 31 January 2025 | Viewed by 8209

Special Issue Editors

Prof. Dr. Carlos J. Gómez García

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Guest Editor
Department of Inorganic Chemistry, Faculty of Chemistry, University of Valencia, C/Dr. Moliner 50, 46100 Burjasot, Valencia, Spain
Interests: molecular magnetism; coordination magnetic polymers; magnetic MOFs; magnetic polyoxometalates; conducting magnetic materials; multifunctional magnetic materials
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Salah-Eddine Stiriba

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Guest Editor
Instituto de Ciencia Molecular/ICMol, Universidad de Valencia, C/Catedrático José Beltrán 2, 46980 Valencia, Spain
Interests: computational chemistry; organic chemistry; polymer organics; hyperbranched polymers; dendrimers; supramolecular chemistry; homogenous catalysis; sustainable chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Friends and Colleagues,

It is with great sadness that we inform you that Miguel passed away on Tuesday, July 9, 2024. This is an immense loss for his family as well as for all of us. Miguel, a distinguished faculty member of the Department of Inorganic Chemistry at the University of Valencia, was loved and respected throughout the research community. Though we will all miss our great friend and colleague, we can take comfort in the fact that he went peacefully.

Requiescat in peace, Miguel

Carlos Gomez and Salah-Eddine Stiriba

As you may know, our friends and colleagues Prof. Miguel Julve and Prof. Francesc Lloret, from the Universidad de Valencia, will be retired (never completely, of course) this academic year 2023/24.

To pay tribute to their long and fruitful scientific careers, we have decided to edit a Special Issue (to appear also as a printed volume) in the journal Magnetochemistry entitled “Magnetic Coordination Compounds and more... a long and successful story: A Tribute to M. Julve and F. Lloret” and we would like to invite you to send a contribution in the form of reviews, mini-reviews, feature articles or original research article for this Special Issue.

Although you can send a contribution at your convenience, we propose an initial deadline of 1 November 2024, to have the Special Issue ready by the end of 2024, the year of their (partial) retirement.

If you are interested in sending a contribution, please send us a tentative title and the type of contribution you would like to submit for this Magnetochemistry Special Issue.

We count with your valuable contribution to pay tribute to the scientific and personal career of our friends Miguel and Paco.

Prof. Dr. Carlos J. Gómez García
Prof. Dr. Salah-Eddine Stiriba
Guest Editors

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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 monthly journal published by MDPI.

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Keywords

  • coordination chemitry
  • magnetochemistry
  • magnetic properties
  • single-molecule magnets
  • magnetic metal–organic frameworks

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Published Papers (12 papers)

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18 pages, 2864 KiB  
Article
Engineering Mononuclear Ln(III) Complexes with a Pseudo-Macrocyclic Hexadentate N4O2 Schiff Base Ligand Exhibiting Slow Magnetic Relaxation
by Ismael Francisco Diaz-Ortega, Yating Ye, Jesus Jover, Eliseo Ruiz, Enrique Colacio and Juan Manuel Herrera
Magnetochemistry 2024, 10(12), 104; https://doi.org/10.3390/magnetochemistry10120104 - 12 Dec 2024
Viewed by 403
Abstract
We report here the synthesis of a series of nine coordinated mononuclear LnIII complexes [LnL1Cl2(DMF)]Cl·2.5DMF and [LnL1(L2)2]Cl·4CH3OH (LnIII = GdIII, DyIII, ErIII and Yb [...] Read more.
We report here the synthesis of a series of nine coordinated mononuclear LnIII complexes [LnL1Cl2(DMF)]Cl·2.5DMF and [LnL1(L2)2]Cl·4CH3OH (LnIII = GdIII, DyIII, ErIII and YbIII, HL2 = 9-anthracenecarboxylic acid), where L1 is a hexadentate N4O2 Schiff base ligand prepared from the condensation of 1,10-phenanthroline-2,9-dicarbaldehyde and semicarbazone. The X-ray crystal structures of these complexes show the LnIII ions to possess LnN4O2Cl2 and LnN4O4 coordination spheres, which can be considered to be derived from a hexagonal bipyramidal geometry, with the ligand in the equatorial plane and the anions (chloride or 9-antracenecarboxylate) in axial positions, which undergo distortion after coordination of either a molecule of DMF or a bidentate coordination of the 9-anthracenecarboxxylate ligand. All these compounds exhibit field-induced slow magnetization relaxation (SMR). The absence of SMR at zero field due to QTM, as well as the processes involved in the magnetic relaxation under a field of 0.1 T, have been justified on the basis of theoretical calculations and the distortion of the respective coordination spheres. The severe discrepancy between the calculated and experimental thermal energy barriers for the DyIII complexes seems to indicate that the relaxation occurs with the contribution of spin–vibrational coupling, which is favored by the flexibility of the ligand. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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20 pages, 6567 KiB  
Article
Calixarene-like Lanthanide Single-Ion Magnets Based on NdIII, GdIII, TbIII and DyIII Oxamato Complexes
by Tamyris T. da Cunha, João Honorato de Araujo-Neto, Meiry E. Alvarenga, Felipe Terra Martins, Emerson F. Pedroso, Davor L. Mariano, Wallace C. Nunes, Nicolás Moliner, Francesc Lloret, Miguel Julve and Cynthia L. M. Pereira
Magnetochemistry 2024, 10(12), 103; https://doi.org/10.3390/magnetochemistry10120103 (registering DOI) - 12 Dec 2024
Viewed by 355
Abstract
In this work, we describe the synthesis, crystal structures and magnetic properties of four air-stable mononuclear lanthanide(III) complexes with the N-(2,4,6-trimethylphenyl)oxamate (Htmpa) of formula: n-Bu4N[Nd(Htmpa)4(H2O)]·4H2O (1), n-Bu4N[Gd(Htmpa)4 [...] Read more.
In this work, we describe the synthesis, crystal structures and magnetic properties of four air-stable mononuclear lanthanide(III) complexes with the N-(2,4,6-trimethylphenyl)oxamate (Htmpa) of formula: n-Bu4N[Nd(Htmpa)4(H2O)]·4H2O (1), n-Bu4N[Gd(Htmpa)4(H2O)]·3DMSO·2H2O (2), n-Bu4N[Tb(Htmpa)4(H2O)]·3DMSO·1H2O (3) and n-Bu4N[Dy(Htmpa)4(H2O)]·3DMSO·2H2O (4) (n-Bu4N+ = n-tetrabutylammonium; DMSO = dimethylsulfoxide). Their crystal structures reveal the occurrence of calixarene-type monoanionic species containing all-cis-disposed Htmpa ligands and one water molecule coordinated with the respective LnIII ion (Ln = Nd, Gd, Tb and Dy), featuring a nine-coordinated environment with muffin (MFF-9) (1) or spherical-capped square antiprism (CSAPR-9) (2–4) geometry. The major difference between their crystal structures is related to the nature of crystallization solvent molecules, either water (1) or both DMSO and water (2–4). The intermolecular hydrogen bonds among the self-complementary Htmpa ligands in all four compounds mediated a 2 D supramolecular network in the solid state. Direct-current (dc) magnetic properties for 1–4 show typical behavior for the ground state terms of the LnIII ions [4I9/2 (Nd); 8S7/2(Gd), 7F6 (Tb), 6H15/2 (Dy)]. Alternating-current (ac) magnetic measurements reveal the presence of slow magnetic relaxation without the presence of a dc field only for 4. In contrast, field-induced slow magnetic relaxation behavior was found in complexes 1, 2 and 3. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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13 pages, 5237 KiB  
Article
A Trinuclear Co(II) Complex Based on the Tris-Dioxolene Triphenylene Non-Innocent Bridge: Complementary Redox, Magnetic Behavior and Theoretical Calculations
by Aristide Colin, Yiting Wang, François Lambert, Nathalie Bridonneau, Nicolas Suaud, Régis Guillot, Eric Rivière, Zakaria Halime, Nathalie Guihéry, Shin-ichi Ohkoshi and Talal Mallah
Magnetochemistry 2024, 10(12), 102; https://doi.org/10.3390/magnetochemistry10120102 - 11 Dec 2024
Viewed by 330
Abstract
A trinuclear Co(II)-containing complex was assembled using the non-innocent hexahydroxytriphenylene bridging ligand. Cyclovoltammetry and spectroelectrochemistry studies revealed that the central ligand sustained four reversible redox events, leading to different species with diverse optical behavior. Complementary analysis of the molecular structure confirmed by ab [...] Read more.
A trinuclear Co(II)-containing complex was assembled using the non-innocent hexahydroxytriphenylene bridging ligand. Cyclovoltammetry and spectroelectrochemistry studies revealed that the central ligand sustained four reversible redox events, leading to different species with diverse optical behavior. Complementary analysis of the molecular structure confirmed by ab initio theoretical calculations were consistent with the bridge in the tris-semiquinone (sq) state for the trinuclear complex. The exchange coupling among the electrons of the bridge resulted in a spin doublet (s = ½) localized close to one of the three Co2+ ions, as suggested by the experimental magnetic data. The central doublet underwent one large antiferromagnetic exchange coupling with one Co(II) and almost no coupling with the two other metal ions. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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12 pages, 3251 KiB  
Article
Controlled Zn(II) to Co(II) Transmetalation in a Metal–Organic Framework Inducing Single-Ion Magnet Behavior
by Paula Escamilla, Nicolás Moliner, Donatella Armentano, Emilio Pardo, Jesús Ferrando-Soria and Thais Grancha
Magnetochemistry 2024, 10(12), 99; https://doi.org/10.3390/magnetochemistry10120099 - 6 Dec 2024
Viewed by 382
Abstract
The intrinsic characteristic features of metal–organic frameworks offer unique, great opportunities to develop novel materials with applications in very diverse fields. Aiming to take advantage of these, the application of post-synthetic methodologies has revealed itself to be a powerful approach to the isolation [...] Read more.
The intrinsic characteristic features of metal–organic frameworks offer unique, great opportunities to develop novel materials with applications in very diverse fields. Aiming to take advantage of these, the application of post-synthetic methodologies has revealed itself to be a powerful approach to the isolation and structuration of metal ions, molecules, or more complex species, either within MOF channels or reticulated at their network, rendering novel and exciting MOFs with new or improved functionalities. Herein, we report the partial post-synthetic metal exchange of Zn(II) metal ions by Co(II) ones in water-stable three-dimensional CaZn6-MOF 1, derived from the amino acid S-methyl-L-cysteine, allowing us to obtain two novel MOFs with increasing contents of the Co(II) ions Co4%@1 and Co8%@1. Remarkably, the presented post-synthetic metal exchange methodology has two relevant implications for us: (i) it allowed us to obtain two novel MOFs, which were not accessible by direct synthesis, and (ii) enabled us to transform physical properties within this family of isoreticular MOFs from the diamagnetic pristine MOF 1 to MOFs Co4%@1 and Co8%@1, exhibiting field-induced, frequency-dependent, alternating current magnetic susceptibility signals, which are characteristic features of single-molecule magnets. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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12 pages, 1933 KiB  
Article
Metallacrown of CeIIICuII5: Synthesis, Structural Characterization and Insights for Nanoparticles
by Jésio D. Tempesta, Fábio Faria Paiva, Leonildo A. Ferreira, Rafaela M. R. da Silva, Luckerman D. G. Botelho, Iara M. L. Rosa, Caio Cesar Candido, Angelo Marcio Gomes, Wallace C. Nunes, Guilherme P. Guedes and Maria Vanda Marinho
Magnetochemistry 2024, 10(12), 96; https://doi.org/10.3390/magnetochemistry10120096 - 30 Nov 2024
Viewed by 557
Abstract
The heterobimetallic 15-MC-5 metallacrown of formula [CeCu5(5mpzHA)5(NO3)(H2O)7]·2NO3·7H2O, designated MC-Ce, was synthesized using 5-methyl-2-pyrazinehydroxamic acid (5mpzHA) as a linker, reacting with CeIII and CuII salts under mild [...] Read more.
The heterobimetallic 15-MC-5 metallacrown of formula [CeCu5(5mpzHA)5(NO3)(H2O)7]·2NO3·7H2O, designated MC-Ce, was synthesized using 5-methyl-2-pyrazinehydroxamic acid (5mpzHA) as a linker, reacting with CeIII and CuII salts under mild conditions. Single-crystal X-ray diffraction analysis reveals a crown-like [Cu5Ce(5mpzHA)5] core, characteristic of a 15-MC-5 system, with five CuII atoms at the rim of the crown and the CeIII ion occupying the dome of the crown, with water molecules, oxygen atoms and one nitrate anion filling the nine-coordination sphere around the CeIII ion, which exhibits a distorted spherical tricapped trigonal prism geometry. The thermogravimetric analysis evidences successive mass losses due to the removal of water molecules and decomposition of the structure after 217 °C, whereas the PXRD analysis of the thermal decomposition residue reveals the presence of copper and copper/cerium oxide particles. These nanocomposite materials were also synthesized using the metallacrown MC-Ce under a hydrothermal method in the presence of multi-walled carbon nanotubes (MWCNTs), affording insights that this metallacrown can act as a source precursor for the synthesis of these mixed cerium/copper oxide nanomaterials. The experimental χMT value in MC-Ce at room temperature is 3.175 cm3 mol−1 K, which is higher than the calculated one for one magnetically isolated CeIII plus five CuII ions, probably due to the antiferromagnetic interactions among CuII ions within the metallacrown hoop plus the thermal depopulation of JZ sublevels of CeIII ground state (5/2), which exhibit a small splitting under the anisotropic ligand field effects. The χMT decreases continuously until it reaches the value of 0.80 cm3 mol−1 K at 10 K, reinforcing the presence of intramolecular antiferromagnetic interactions. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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18 pages, 2757 KiB  
Article
Building Up a Hexacopper(II)-Pyrazolate/Oxamate Magnetic Complex with Rare Ethane-1,2-Dioxide (–OCH2CH2O–) as a Bridge Between Copper(II) Units
by Willian X. C. Oliveira, Victor G. Araújo, Carlos B. Pinheiro, Miguel Julve and Cynthia L. M. Pereira
Magnetochemistry 2024, 10(12), 94; https://doi.org/10.3390/magnetochemistry10120094 - 29 Nov 2024
Viewed by 716
Abstract
The synthesis, structural, and magnetic characterization of a novel neutral copper(II) hexanuclear complex [Cu6(en)4(OCH2CH2O)2(pyox)4]·3eg·en·12H2O (1) was investigated [en = ethylenediamine, eg = ethylene glycol, and H2 [...] Read more.
The synthesis, structural, and magnetic characterization of a novel neutral copper(II) hexanuclear complex [Cu6(en)4(OCH2CH2O)2(pyox)4]·3eg·en·12H2O (1) was investigated [en = ethylenediamine, eg = ethylene glycol, and H2pyox = 4-(1H-pyrazole-4-yl)phenylene-N-oxamic acid]. The crystal structure of 1, obtained by the single-crystal X-ray diffraction technique, revealed that the hexacopper(II) complex is built from two linear tricopper(II) complex subunits. Each subunit contains two [Cu(en)]2+ moieties connected to a [Cu(OCH2CH2O)] unit by two pyox2− ligands acting as μ-κN:κN′ bridges, as well as a [OCH2CH2O]2− ligand, which is ultimately found in the μ3-κO,O′:κO:κO′ coordination form. The subunits are connected via the amide portion of the pyox2− ligand, linked to copper atoms in the other subunit. They occupy the apical coordination positions, leading the trinuclear copper(II) segments to be almost perpendicular. The structural, chemical, and spectroscopic characterizations evidenced that ethylene glycol acted both as a solvent and a reactant upon deprotonation, forming the –OCH2CH2O– ligand due to the basic crystallization environment. DC magnetic studies revealed a strong antiferromagnetic interaction between the copper atoms within the trinuclear subunits, influenced by alkoxide and pyrazolate bridging ligands. Our findings offer new insights into the structural and magnetic properties of copper(II) complexes, enhancing the understanding of metal–ligand interactions in supramolecular chemistry. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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16 pages, 5155 KiB  
Article
Mesoxalate-Bridged Heptanuclear Copper(II) Complexes: Structure and Magnetic Properties
by Beatriz Gil-Hernández, Simon Millan, Irina Gruber, Christoph Janiak, Carlos J. Gómez-García and Joaquín Sanchiz
Magnetochemistry 2024, 10(12), 93; https://doi.org/10.3390/magnetochemistry10120093 - 22 Nov 2024
Viewed by 450
Abstract
Two new compounds, (NH4)4[Cu7(Hmesox)6(H2O)8]∙10H2O (1) and [Ru(bpy)3]4[Cu7(Hmesox)6Cl2]Cl2∙2CH3CN∙12H2O (2), were [...] Read more.
Two new compounds, (NH4)4[Cu7(Hmesox)6(H2O)8]∙10H2O (1) and [Ru(bpy)3]4[Cu7(Hmesox)6Cl2]Cl2∙2CH3CN∙12H2O (2), were prepared and their structures were solved by single-crystal X-ray diffraction (mesoxalic acid = dihydroxypropanedioic acid, H4mesox). The triply deprotonated mesoxalate anion acts as a chelating and bridging ligand with its carboxylate and alkoxide groups, forming the anionic heptanuclear copper(II) clusters [Cu7(Hmesox)6(H2O)8]4− and [Cu7(Hmesox)6Cl2]6− in 1 and 2, respectively. Variable temperature magnetic studies revealed antiferromagnetic interactions in 1 and the coexistence of ferro and antiferromagnetic interactions in 2. The [Ru(bpy)3]2+ cations provided luminescent properties to compound 2. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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12 pages, 2875 KiB  
Article
Two New 2p–3d Metal Complexes with a Nitronyl-Nitroxide Ligand Derived from o-Vanillin: Synthesis, Crystals Structures and Magnetic Properties
by Cristian Andrei Spinu, Daniel O. T. A. Martins, Teodora Mocanu, Mihaela Hillebrand, Jean-Pascal Sutter, Floriana Tuna and Marius Andruh
Magnetochemistry 2024, 10(11), 86; https://doi.org/10.3390/magnetochemistry10110086 - 1 Nov 2024
Viewed by 962
Abstract
Two new 2p–3d complexes, (Et3NH)[ML(hfac)2], have been obtained using the nitronyl-nitroxide radical (HL) derived from 2-hydroxy-3-methoxy-5-nitrobenzaldehyde (M = Mn 1; Co 2). The two compounds are isomorphous and their structures consist of anionic mononuclear species, [M(hfac)2 [...] Read more.
Two new 2p–3d complexes, (Et3NH)[ML(hfac)2], have been obtained using the nitronyl-nitroxide radical (HL) derived from 2-hydroxy-3-methoxy-5-nitrobenzaldehyde (M = Mn 1; Co 2). The two compounds are isomorphous and their structures consist of anionic mononuclear species, [M(hfac)2L]−, M = Mn 1; Co 2, and triethylammonium cations, Et3NH+. The metal ions adopt an octahedral geometry, being coordinated by phenoxido and aminoxyl oxygen atoms from the ligand and four oxygen atoms from the hexafluoroacetylacetonato (hfac−) ligand. The cryomagnetic behaviors of the two compounds reveal relatively strong antiferromagnetic M(II)-Rad interactions (JMnRad = −191 cm−1, JCoRad = −166 cm−1 with H = −JSMSRad). The EPR spectra (X- and Q-band) of compound 1 below 70 K show the characteristical features of a S = 2 spin system with zero field splitting terms of D = 0.26 cm−1 and E = 0.031 cm−1. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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13 pages, 2979 KiB  
Article
[MnIII6MnIINaI2], [MnIII3MnIINaI], and [MnIII3] Clusters Derived from Schiff Bases: Syntheses, Structures, and Magnetic Properties
by Johannes Löhr, Mercè Font-Bardia, Júlia Mayans and Albert Escuer
Magnetochemistry 2024, 10(10), 76; https://doi.org/10.3390/magnetochemistry10100076 - 10 Oct 2024
Viewed by 702
Abstract
The reaction of manganese halides with polydentate Schiff bases obtained by the condensation of 3-ethoxysalicylaldehyde and different amino alcohols, resulting in a NO3 set of donors, yielded a series of manganese clusters with {MnIII6MnIINa2}, {Mn [...] Read more.
The reaction of manganese halides with polydentate Schiff bases obtained by the condensation of 3-ethoxysalicylaldehyde and different amino alcohols, resulting in a NO3 set of donors, yielded a series of manganese clusters with {MnIII6MnIINa2}, {MnIII3MnIINa}, and {MnIII3} metallic cores. The influence of the ligand substituents and the halide on the final nuclearity has been studied. Analysis of their static magnetic behaviour confirms the ground states of 19/2 for the {MnIII6MnIINa2} complexes, 7/2 for the {MnIII3MnIINa} clusters, and 12/2 for the triangular {MnIII3} systems, and a weak field induced a slow relaxation of the magnetization for the trinuclear complexes. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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22 pages, 4862 KiB  
Article
Theoretical Hints to Optimize Energy Dissipation and Cell–Cell Response in Quantum Cellular Automata Based on Tetrameric and Bidimeric Cells
by Andrew Palii, Shmuel Zilberg and Boris Tsukerblat
Magnetochemistry 2024, 10(10), 73; https://doi.org/10.3390/magnetochemistry10100073 - 30 Sep 2024
Viewed by 626
Abstract
This article is largely oriented towards the theoretical foundations of the rational design of molecular cells for quantum cellular automata (QCA) devices with optimized properties. We apply the vibronic approach to the analysis of the two key properties of such molecular cells, namely [...] Read more.
This article is largely oriented towards the theoretical foundations of the rational design of molecular cells for quantum cellular automata (QCA) devices with optimized properties. We apply the vibronic approach to the analysis of the two key properties of such molecular cells, namely the cell–cell response and energy dissipation in the course of the non-adiabatic switching of the electric field acting on the cell. We consider two kinds of square planar cells, namely cells represented by a two-electron tetrameric mixed valence (MV) cluster and bidimeric cells composed of two one-electron MV dimeric half-cells. The model includes vibronic coupling of the excess electrons with the breathing modes of the redox sites, electron transfer, intracell interelectronic Coulomb repulsion, and also the interaction of the cell with the electric field of polarized neighboring cells. For both kinds of cells, the heat release is shown to be minimal in the case of strong delocalization of excess electrons (weak vibronic coupling and/or strong electron transfer) exposed to a weak electric field. On the other hand, such a parametric regime proves to be incompatible with a strong nonlinear cell–cell response. To reach a compromise between low energy dissipation and a strong cell–cell response, we suggest using weakly interacting MV molecules with weak electron delocalization as cells. From this point of view, bidimeric cells are advantageous over tetrameric ones due to their smaller number of electron transfer pathways, resulting in a lower extent of electron delocalization. The distinct features of bidimeric cells, such as their two possible mutual arrangements (“side-by-side” and “head-to-tail”), are discussed as well. Finally, we briefly discuss some relevant results from a recent ab initio study on electron transfer and vibronic coupling from the perspective of the possibility of controlling the key parameters of molecular QCA cells. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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21 pages, 4971 KiB  
Article
Manganese (III) Compounds Derived from R-Salicylaldoxime and 9-Anthracenecarboxylate Ligands: A Study of Their Synthesis and Structural, Magnetic, and Luminescent Properties
by Berta Casanovas, Ramon Vicente, Mercè Font-Bardía and Mohamed Salah El Fallah
Magnetochemistry 2024, 10(8), 55; https://doi.org/10.3390/magnetochemistry10080055 - 5 Aug 2024
Viewed by 1007
Abstract
The reaction of Mn(II) salts in the air with different R-salicylaldehyde oximes and the sodium or cesium salts of 9-anthracenecarboxylato (9-AC) allows for the isolation of new six polynuclear compounds: [Mn3NaO(salox)3(9-AC)2(EtOH)3H2O]n·2EtOH [...] Read more.
The reaction of Mn(II) salts in the air with different R-salicylaldehyde oximes and the sodium or cesium salts of 9-anthracenecarboxylato (9-AC) allows for the isolation of new six polynuclear compounds: [Mn3NaO(salox)3(9-AC)2(EtOH)3H2O]n·2EtOH (1), [Mn3NaO(3-Me-salox)3(9-AC)2(EtOH)3H2O]n·EtOH (2), [Mn6O2(salox)6(9-AC)2(EtOH)2(H2O)2]·3EtOH (3), [Mn3O(3-Me-salox)3(9-AC)(EtOH)3(H2O)]·1.8EtOH·3H2O (4), [Mn6O2(Me-salox)6(9-AC)2(EtOH)4(H2O)2]·0.5H2O (5), and [Mn6O2(Et-salox)6(9-AC)2(EtOH)4(H2O)2]·3EtOH (6). H2salox is a salicylaldehyde oxime, H2(3-Me-salox) is a 3-methyl-salicylaldehyde oxime, H2Me-salox is a 1-(2-hydroxyphenyl)ethan-1-one oxime and a H2-Et-salox is 1-(2-hydroxyphenyl)propan-1-one oxime. Structurally, compounds 1 and 2 consist of chains of trinuclear {MnIII3(μ3-O)(salox)3}+ units connected by Na+ ions. Compounds 3, 5, and 6 are hexanuclear units formed by two parallel trinuclear units {MnIII3(μ3-O)(salox)3}+ or {MnIII3(μ3-O)(Me-salox)3}+ planes related through an inversion center. Compound 4 consists of two isolated [Mn3O(3-Me-salox)3(9-AC)(EtOH)3(H2O)] trinuclear molecules in the unit cell showing crystallographic differences. Magnetic studies reveal a set of antiferromagnetic interactions in compounds 1 and 2 and a combination of antiferromagnetic and ferromagnetic interactions in compounds 3, 5, and 6. In all cases, the magneto-structural correlation between the intramolecular MnIII-N-O-MnIII torsion angle and the magnetic exchange within these units have been confirmed. For compounds 5 and 6, ac magnetic measurements reveal the slow relaxation of magnetization with moderate energy barriers of 19.9 cm−1 and 31.1 cm−1, respectively. Absorbance and fluorescence measurements in solution show the transitions of the 9-anthracenecarboxylate chromophore for all the compounds. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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23 pages, 1964 KiB  
Review
Recent Insights into Magneto-Structural Properties of Co(II) Dicyanamide Coordination Compounds
by Anna Świtlicka
Magnetochemistry 2024, 10(11), 90; https://doi.org/10.3390/magnetochemistry10110090 - 18 Nov 2024
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Abstract
In recent decades, the chemistry of transition metal coordination compounds has undergone continuous development at both scientific and application levels. The diversity of metal(II) complexes, along with their structural features and physicochemical properties, makes them attractive for a wide range of applications. The [...] Read more.
In recent decades, the chemistry of transition metal coordination compounds has undergone continuous development at both scientific and application levels. The diversity of metal(II) complexes, along with their structural features and physicochemical properties, makes them attractive for a wide range of applications. The dicyanamide ion (N(CN)2) has the ability to form various transition metal compounds characterized by different architectures and topologies. The interaction of π-electrons from the nitrile groups with the π-system of the central nitrogen may enable electron delocalization, potentially facilitating electron transfer between the metal centers through the bridging dicyanamide (dca) ligand. This review focuses on dca–Co(II) compounds and, after a brief introduction, the structural aspects and magnetic properties are analyzed in detail. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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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.

Title: Exploring Spin-Crossover Cobalt(II) Single-Ion Magnets: Advancements and Prospects in Molecular Spintronics and Quantum Computing Technologies
Authors: Salah Stiriba; Joan Cano Boquera; Rafael Ruiz García
Affiliation: Universitat de València, Valencia, Spain

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