Multifunctional Compound Combining Conductivity and Single-Molecule Magnetism in the Same Temperature Range

Abstract

We report the first highly conducting single-molecule magnet, (BEDO)[ReF]·6HO [1; BEDO = bis(ethylenedioxo)tetrathiafulvalene], whose conductivity and single-molecule magnetism coexist in the same temperature range. The compound was synthesized by BEDO electrocrystallization in the presence of (PhP)[ReF]·2HO and characterized by crystallography and measurements of the conductivity and alternating-current magnetic susceptibility.

New Radical Cation Salts Based on BDH-TTP Donor: Two Stable Molecular Metals with a Magnetic [ReF6]2− Anion and a Semiconductor with a [ReO4]− Anion

“…In 2018, we used the oxygen analog of BEDT-TTF, bis(ethylenedioxo)tetrathiafulvalene (BEDO), Scheme 1, as an organic π-donor and investigated its electrochemical oxidation in the presence of the Re(IV) hexafluoride complex, [ReF 6 ] 2− , which in the composition of (PPh 4 ) 2 [ReF 6 ]•2H 2 O salt displays SMM properties below 5 K under application of a low permanent magnetic field [15]. As a result, the first conductive field-induced SMM was synthesized-(BEDO) 4 [ReF 6 ]•6H 2 Oin which conductivity and single-molecule magnetism coexist in the same temperature range [16]. More recently, another BEDO salt has been synthesized with a monomolecular magnet [Co(pdms)] 2− as a counterion, which also shows the coexistence of conductivity and monomolecular magnetism up to 11 K [17].…”

“…The presence of maxima in the frequency or field dependences of χ″ indicates a slow relaxation of the magnetization, which is one of the distinctive features of SMMs [7][8][9][10][11]. Thus, the study of the ac susceptibility of salt 1 shows that this compound is not an SMM, unlike the parent complex (PPh4)2[ReF6] 2H2O [15] and the organic metal (BEDO)4[ReF6]•6H2O [16]. The loss of SIM properties by the anion [ReF6] 2− in the composition of salt 1 is possibly associated with the presence of greater disorder in the structure of the anionic layers in crystals of 1.…”

Coexistence of metamagnetism and slow relaxation of magnetization in ammonium hexafluoridorhenate

“…However, the isolation of the subsequent water-soluble A 2 [ReF 6 ] salt has shown to be challenging. 4,5 Recently, detailed procedures for the preparation of K [ReF 6 ] has been studied by X-ray absorption spectroscopy, 7 thermal gravimetric analysis 14,15 and was used as a precursor for preparing materials with remarkable magnetic properties, 9,11,12 up to now there is no available single crystal Xray data of the salt. In salts containing the [ReX 6 ] 2À (X ¼ F, Cl, Br, I) anions, the Re(IV) ion (5d 3 ) forms a hexakis-monodentate coordination with the halogen atoms resulting in either a regular or slightly distorted octahedral geometry.…”

“…The magnetic properties of several species containing [ReX 6 ] 2À (X ¼ Cl, Br, I) anions have been studied for more than 65 years. 17 12 Overall, there is a need to further develop and explore the structural and magnetic chemistry of hexauoridorhenate(IV) compounds. In this context, the (NH 4 ) 2 [ReF 6 ] salt was prepared and characterized by X-ray diffraction (single crystal and powder), IR and Raman spectroscopies, DC and AC magnetic susceptibility measurements, and computational methods.…”

Electrospun Janus-like pellicle displays coinstantaneous tri-function of aeolotropic conduction, magnetism and luminescence

“…8,9 There are many methods to obtain multifunctional materials, such as chemical graing, 10 modication 11,12 and compound methods. 13,14 Compound is one of the universal methods to obtain multifunctional materials with comprehensive performances. Introducing different substances into a matrix 15,16 is a typical compound method.…”