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Synthesis and Applications of New Spin Crossover Compounds

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ISBN: 9783039213610 9783039213627 Year: Pages: 254 DOI: 10.3390/books978-3-03921-362-7 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Physics (General)
Added to DOAB on : 2019-12-09 11:49:15
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The crystal chemistry of spin crossover (SCO) behavior in coordination compounds can potentially be in association with smart materials—promising materials for applications as components of memory devices, displays, sensors and mechanical devices and, especially, actuators, such as artificial muscles. This Special Issue is devoted to various aspects of SCO and related research, comprising 18 interesting original papers on valuable and important SCO topics. Significant and fundamental scientific attention has been focused on the SCO phenomena in a wide research range of fields of fundamental chemical and physical and related sciences, containing the interdisciplinary regions of chemical and physical sciences related to the SCO phenomena. Coordination materials with bistable systems between the LS and the HS states are usually triggered by external stimuli, such as temperature, light, pressure, guest molecule inclusion, soft X-ray, and nuclear decay. Since the first Hofmann-like spin crossover (SCO) behavior in {Fe(py)2[Ni(CN)4]}n (py = pyridine) was demonstrated, this crystal chemistry motif has been frequently used to design Fe(II) SCO materials to enable determination of the correlations between structural features and magnetic properties.

Keywords

spin crossover --- spin transition --- cobalt(II) ion --- paramagnetic ligand --- aminoxyl --- switch --- mosaicity --- spin crossover --- X-ray diffraction --- fatigability --- single crystal --- phase transition --- structural disorder --- spin-crossover --- dinuclear triple helicate --- Fe(II) --- solvent effects --- metal dithiolene complexes --- [Au(dmit)2]?, [Au(dddt)2]? --- ion-pair crystals --- [Fe(III)(3-OMesal2-trien)]+ --- coordination complexes --- crystal structure --- magnetic properties --- magnetic susceptibility --- magnetization --- spin-crossover transition --- Fe(II) complex --- dipyridyl-N-alkylamine ligands --- high spin (HS) --- low spin (LS) --- spin cross-over (SCO) --- magnetic transition --- cobalt oxide --- spin polaron --- impurity effect --- spin-state crossover --- coordination polymer --- supramolecular isomerism --- spin crossover --- crystal engineering --- spin crossover --- X-ray absorption spectroscopy --- soft X-ray induced excited spin state trapping --- high spin --- spin-crossover --- LIESST effect --- hydrogen bonding --- ?-? interactions --- charge-transfer phase transition --- iron mixed-valence complex --- hetero metal complex --- dithiooxalato ligand --- substitution of 3d transition metal ion --- ferromagnetism --- dielectric response --- 57Fe Mössbauer spectroscopy --- Fe(III) coordination complexes --- hexadentate ligand --- Schiff base --- spin crossover --- UV-Vis spectroscopy --- SQUID --- EPR spectroscopy --- spin-crossover --- optical microscopy --- reaction diffusion --- spin crossover --- Fe(III) complex --- qsal ligand --- thermal hysteresis --- structure phase transition --- counter-anion --- solvate --- lattice energy --- optical conductivity spectrum --- spiral structure --- 1,2-bis(4-pyridyl)ethane --- supramolecular coordination polymer --- chiral propeller structure --- atropisomerism --- spin crossover --- iron(II) complexes --- C–H···? interactions --- magnetic properties --- thermochromism --- spin crossover --- linear pentadentate ligand --- iron(II) --- mononuclear --- 1,2,3-triazole --- crystal structure --- magnetic properties --- DFT calculation --- intermolecular interactions --- amorphous --- spin crossover --- Cu(II) complexes --- nitroxides --- phase transitions --- magnetostructural correlations --- iron (II), spin crossover --- X-ray diffraction --- coordination polymers --- n/a

Magnetism of Molecular Conductors

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ISBN: 9783038429319 9783038429326 Year: Pages: X, 226 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General)
Added to DOAB on : 2018-06-22 12:42:49
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The study of the magnetic properties of molecular conductors has experienced, over the last few decades, a very significant evolution, comprising systems of increasing molecular complexity and moving towards multifunctional materials. In this context, molecular magnetic conductors have emerged at the intersection between the fields of molecule-based conductors and molecule-based magnets as a very exciting class of multifunctional materials in which the interaction and synergy between conduction electrons and localized magnetic moments can lead to new phenomena, complex phase diagrams, and different ground states, with a large potential for technological applications, namely in electronic devices, sensors and spintronics. Among these phenomena are unusual field-induced transitions, including magnetic-field-induced superconductivity, very large magnetoresistance effects, conductors that are switchable by magnetic field, changes of magnetic ordering or spin state, etc.This Special Issue of Magnetochemistry features a collection of research contributions illustrating recent achievements on different aspects of the development, study and understanding of the magnetic properties of molecular conductors and their applications. Many different types of compounds are considered in this Special Issue.

Spin-Crossover Complexes

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ISBN: 9783038428251 9783038428268 Year: Pages: VI, 200 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General)
Added to DOAB on : 2018-06-26 14:01:59
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The spin-crossover (SCO) phenomenon originates from the intrinsic bistability of the d-electron configuration, created by the competition between ligand-field splitting and spin-pairing energies in a first coordination sphere of transition metal ions. Since Cambi’s visionary finding of the SCO phenomenon in 1931, considerable knowledge concerning syntheses, crystal structures, magnetic and thermodynamic properties, spectroscopies, molecular orbital calculations, and theories of SCO complexes has accumulated in a very large number of inorganic molecular coordination compounds, and, in addition, inorganic cobaltates and bioinorganic molecular systems. Recent studies which have focused on other electronic properties exhibited by SCO complexes themselves, control of molecular assemblies, and moreover, multifunctionalization of SCO complexes with either different electronic properties or porous frameworks will open the possibility toward future practical applications of SCO complexes. Thus, the fundamentals and applications of SCO complexes afford a very exciting research field in inorganic coordination chemistry and continues to attract growing attention on a wide range of relevant research fields. This Special Issue aims at collecting research and review contributions concerning recent advances in all aspects of SCO and related phenomena and disseminating this extensive knowledge with a broader audience by means of open access publishing. I invite you to contribute papers in the following research areas so that your research can impact the next generation trends in this promising field.

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

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ISBN: 9783039289011 / 9783039289028 Year: Pages: 134 DOI: 10.3390/books978-3-03928-902-8 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General)
Added to DOAB on : 2020-06-09 16:38:57
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Research on molecule-based magnetic materials was systematized in the 1980s and expanded rapidly. A Special Issue focusing on molecule-based magnetic substances was published in Magnetochemistry. However, the functionalities of the substances increase daily; therefore, the researchers’ quest is not yet in decline. Research on molecule-based magnetism developed across many fields, including chemistry, physics, material chemistry, and applied physics, and the use of the various functionalities of these molecule-based magnetic substances has greatly influenced research on spin-based devices. In honor of Professor Masahiro Yamashita, who contributed greatly to this field, I have put together a Special Issue that highlights ten groundbreaking articles. The issue is entitled, “A Themed Issue of Functional Molecule-Based Magnets: Dedicated to Professor Masahiro Yamashita on the Occasion of his 65th Birthday”. I wish to thank the authors for their dedicated work, and the referees and editorial staff for the time they invested commenting on the articles.

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