The properties of an organic molecular ferromagnet [C(60)TDAE(086); TDAE is tetrakis(dimethylamino)ethylene] with a Curie temperature ;T(c) = 161 kelvin are described The ferromagnetic state shows no remanence, and the temperature dependence of the magnetization below ;T(c) does not follow the behavior expected of a conventional ferromagnet These results are interpreted as a reflection of a three-dimensional system leading to a soft ferromagnet

https://science.sciencemag.org/content/sci/253/5017/301.full.pdf

Organic molecular soft ferromagnetism in a fullerene c60.

2.2. BETS Salts with Halometalate Anions 5424 3. Magnetic Metals and Semiconductors 5426 3.1. Mononuclear Metal Complexes 5427 3.1.1. Tetrahalometalates 5427 3.1.2. Hexahalo Anions 5431 3.1.3. Pseudohalide-Containing Anions 5431 3.2. Polynuclear Metal Complexes 5433 3.2.1. Dimeric Anions 5433 3.2.2. Polyoxometalate Clusters 5434 3.3. Chain Anions: Maleonitriledithiolates 5439 4. Ferromagnetic Conductors 5441 5. Ferrimagnetic Insulators 5443 6. Conclusions 5445 7. Acknowledgment 5446 8. References 5446

Magnetic Molecular Conductors

Synthesis, structure, and bonding in polyiodide and metal iodide-iodine systems.

The literature has shown numerous contributions on the synthesis and physicochemical properties of persistent organic radicals but there are a lesser number of reports about their use as building blocks for obtaining molecular magnetic materials exhibiting an additional and useful physical property or function. These materials show promise for applications in spintronics as well as bistable memory devices and sensing materials. This critical review provides an up-to-date survey to this new generation of multifunctional magnetic materials. For this, a detailed revision of the most common families of persistent organic radicals—nitroxide, triphenylmethyl, verdazyl, phenalenyl, and dithiadiazolyl—so far reported will be presented, classified into three different sections: materials with magnetic, conducting and optical properties. An additional section reporting switchable materials based on these radicals is presented (257 references).

Playing with organic radicals as building blocks for functional molecular materials

Bulk ferromagnetism in the β-phase crystal of the p-nitrophenyl nitronyl nitroxide radical

An ambient pressure superconductivity of (BEDT-TTF)2Cu(SCN)2 was observed by d.c. magnetic susceptibility and electrical conductivity measurements. The superconducting critical temperature is the highest (TC=10.4 K) among the organic superconductors so far obtained, even though the anion has a positional disorder in the crystal.

A New Ambient Pressure Organic Superconductor Based on BEDT-TTF with TC Higher than 10 K (TC=10.4 K)

Ferromagnetic intermolecular interaction in the galvinoxyl radical: Cooperation of spin polarization and charge-transfer interaction

The electron-spin resonance g value, linewidth, line shape, and spin susceptibility of single crystals of the \ensuremath{\alpha} and \ensuremath{\beta} phases of di[bis(ethylenedithiolo)tetrathiafulvalene]triiodide [(BEDT-TTF${)}_{2}$${\mathrm{I}}_{3}$] are each found to show marked temperature and angular dependences in the temperature range from 5 to 300 K. In both phases, a Dysonian line-shape characteristic of conduction-electron-spin resonance is observed at room temperature when the microwave electric field is applied parallel to the quasi-two-dimensional conducting plane of the crystal. In the superconducting phase of \ensuremath{\beta}-(BEDT-TTF${)}_{2}$${\mathrm{I}}_{3}$ with appropriate crystal size, it is found that when the microwave electric field is applied perpendicular to the plane a Lorentzian line shape observed at room temperature is gradually converted to a Dysonian line shape with decreasing temperature. These phenomena are discussed in comparison with the transport parameters derived from the reflectance spectra and the conductivity measurements. The spin diffusion constants in the \ensuremath{\alpha} and \ensuremath{\beta} phases are estimated to be about 0.2 and 0.3 ${\mathrm{cm}}^{2}$ ${\mathrm{s}}^{\mathrm{\ensuremath{-}}1}$, respectively. These constants are in agreement with the carrier diffusion constants evaluated independently by the analysis of the reflectance spectra. For the \ensuremath{\alpha} phase, it is suggested from the temperature dependences of the g value and linewidth that there is a strong interaction between the triiodide and BEDT-TTF ions and the magnitude of the interaction changes suddenly with the metal-insulator transition.

Conduction-electron-spin resonance in organic conductors: α and β phases of di[bis(ethylenedithiolo)tetrathiafulvalene]triiodide [(BEDT-TTF ) 2 I 3 ]

The magnetic properties of the 4:1, 6:1, 9:1, and 19:1 mixed crystals of galvinoxyl (4‐[[3,5‐bis(1,1‐dimethylethyl)‐4‐oxo‐2,5‐cyclohexadien‐1‐ylidene]methyl]‐2,6 ‐bis(1,1‐dimethylethyl) phenoxy) radical and its precursory closed shell compound, hydrogalvinoxyl, have been studied. From the measurements of the temperature dependence of the magnetic susceptibility, it is found that the ferromagnetic intermolecular interactions, which are lost below about 85 K in pure galvinoxyl because of the phase transition, are maintained down to 2 K in these mixed crystals, and that the number of galvinoxyl radicals keeping the ferromagnetically coupled structure at low temperature increases as the concentration of hydrogalvinoxyl increases. The magnetic behavior of the mixed crystals at low temperature depends on the thermal history of the sample and is well interpreted by assuming the presence of a glassy state into which the high‐temperature, ferromagnetically coupled phase is quenched. The magnetization curves show t...

Tadashi Sugano

Papers

A New Ambient Pressure Organic Superconductor Based on BEDT-TTF with TC Higher than 10 K (TC=10.4 K)

Ferromagnetic intermolecular interaction in the galvinoxyl radical: Cooperation of spin polarization and charge-transfer interaction

Conduction-electron-spin resonance in organic conductors: α and β phases of di[bis(ethylenedithiolo)tetrathiafulvalene]triiodide [(BEDT-TTF ) 2 I 3 ]

Ferromagnetic intermolecular interactions in a series of organic mixed crystals of galvinoxyl radical and its precursory closed shell compound

The structure of tetrathiafulvalenium perchlorate, TTF+.ClO4−