Structures and properties of a BEDT-TTF-based organic charge transfer salt and the zwitterion of ferrocenesulfonate

Abstract

The structure and properties of a new semiconducting BEDT-TTF-based charge-transfer salt containing the ferrocenesulfonate (Fc-SO3(-)) anion, α-(BEDT-TTF)2Fc-SO3·2.5H2O, are described. The structure and magnetic properties of a zwitterion of ferrocenesulfonate, Fc(+)-SO3(-), are also reported.

Structure and Properties of a BEDT‐TTF‐Based Organic Conductor with a Ferrocene‐Based Magnetic Anion Octamethylferrocenedisulfonate

“…The magnetic data can be fitted by the combination of a Curie–Weiss ( C = 0.721 emu K mol –1 ) and 2D Heisenberg (2DH) models with θ = –5.5 K and J 2DH = –80.3 K. This suggests that the spins of the Fc moieties and BEDT‐TTF layers obey 2D Heisenberg and Curie–Weiss models, respectively. The J 2DH value of –80.3 K caused by the interaction between spins on the BEDT‐TTF layers almost corresponds to those observed in other salts having 2D magnetic BEDT‐TTF layers , . The spins seem to form a square lattice and to interact with each other along the a and b directions (see Figure b).…”

“…375) of 1.096 emu K mol –1 , suggesting that the stable radical parts and also the BEDT‐TTF layers possess spins. Since the observed χT value is approximately 0.1 emu K mol –1 smaller than the expected value, this implies that there are strong antiferromagnetic interactions, which are usually observed between spins on BEDT‐TTF layers , . These results support the hypothesis that spins are located on the BEDT‐TTF layers.…”

“…Moreover, the ferrocenyl parts of the salts are neutral and therefore diamagnetic. We have also prepared several tetrathiafulvalene (TTF) and bis(ethylenedithio)tetrathiafulvalene (BEDT‐TTF) salts with sulfonates of the ferrocene derivatives, one of which showed metallic conductivity but the ferrocenyl part (Fc) was neutral and diamagnetic …”

Bis(vinylenedithio)tetrathiafulvalene analogues of BEDT-TTF

“…TTF analogues have been synthesized by coupling and without coupling methods [ 45 – 46 ]. Depending on the presence of electron-withdrawing groups on the TTF, they exhibit various oxidation potential ranges [ 15 , 26 ]. Recently, TTF and analogues have received widespread attention involving the development of new materials by using various anions to form different charge transfer salts.…”

A 2D Interactive Spin Ladder System, δ′-(BEDT-TTF)2ClC2H4SO3·H2O

“…For the insulators and semiconductors, the charge carriers cannot freely move and are localized on the donor layers, providing various magnetic ground states. The range of ground states include antiferromagnetic and canted ferromagnetic orderings, spin density wave, 1D and 2D Heisenberg magnets, and compounds characterized by a singlet–triplet model . The magnetic moment is not localized in an atomic orbital, as in transition-metal magnets, and not localized in a specific part of a molecule, as in organic radicals, but is delocalized across a whole BEDT-TTF molecule.…”