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Article Dans Une Revue Journal of Materials Chemistry C Année : 2023

A tetrathiafulvalene salt of the nitrite (NO2−) anion: investigations of the spin-Peierls phase

Résumé

Electrocrystallization of ortho-dimethyltetrathiafulvalene (o-DMTTF) in the presence of a nitrite (NO2−) anion affords a 2 : 1 phase, namely (o-DMTTF)2NO2, the first example of an isolated cation radical salt with NO2−. The o-DMTTF molecule organizes into strongly dimerized stacks that adopt a rare chessboard organization, associated with a strongly 1D structure. As a consequence of dimerization, the salt exhibits a semiconducting behavior (σRT = 5 S cm−1, Eact = 0.1 eV). The bent NO2− anion is disordered on the inversion center but does not exhibit any anion-ordering transition. Combined SQUID magnetometry and electron paramagnetic resonance (EPR) experiments demonstrate the appearance of a spin-Peierls transition with TSP = 70 K. The temperature dependence of the spin gap and associated dimerization parameter δ across the spin-Peierls transition have been determined. The low-temperature narrow EPR line observed below TSP is attributable to intrinsic magnetic defects localized on the o-DMTTF molecules themselves. The broadening of the EPR line at higher magnetic fields is associated with the disordered NO2− anions surrounding these magnetic defects, contributing to the inhomogeneity of their g factor.

Domaines

Matériaux
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Origine : Publication financée par une institution

Dates et versions

hal-04006059 , version 1 (27-02-2023)

Identifiants

Citer

Loïc Soriano, Maylis Orio, Olivier Pilone, Olivier Jeannin, Eric Reinheimer, et al.. A tetrathiafulvalene salt of the nitrite (NO2−) anion: investigations of the spin-Peierls phase. Journal of Materials Chemistry C, In press, ⟨10.1039/d2tc05431k⟩. ⟨hal-04006059⟩
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