Stable Metallic Behavior and Antiferromagnetic Ordering of Fe(III) d Spins in (EDO-TTFVO)₂·FeCl₄

Abstract

We report the crystal structure and physical properties of the 2:1 FeCl4- salt of a new donor molecule, EDO-TTFVO. Crystal structure analysis of this salt revealed that the donor molecules formed a beta' '-type two-dimensional conducting layer, and there is a short S...Cl contact between the donor molecules and the FeCl4- ions, which is expected to mediate a strong pi-d interaction. This salt showed a stable metallic conducting behavior down to 0.3 K and an antiferromagnetic ordering at TN approximately 3.0 K, indicating that this salt becomes a new antiferromagnetic molecular metal at ambient pressure. The appearance of the magnetic ordering is considered to originate from the strong pi-d interactions between the donor molecules and the FeCl4- ions because the field dependence of magnetoresistances was remarkably affected below the antiferromagnetic transition temperature.

Highly Active and Recyclable Metal Oxide Catalysts for the Prins Condensation of Biorenewable Feedstocks

“…The Fe–Cl bond lengths and the Cl–Fe–Cl bond angles are in the range of 2.173(1) to 2.197(1) Å (mean 2.187 Å) and 107.59(1) to 112.59(1)° (mean 109.4°), respectively. The values are in the expected range found for other compounds containing tetrachloridoferrate(III) such as [Fe(L) 3 ][FeCl 4 ] 2 4e, [Fe(PDN) 2 (H 2 O) 2 ][FeCl 4 ] 2 · 4CH 3 NO 2 (PDN = p ‐phthalodinitrile)4i, [EDO‐TTFVO] 2 [FeCl 4 ] (EDO‐TTFVO = ethylenedioxy‐tetrathiafulvalenoquinone‐1, 3‐dithiolemethide)7a, (BEDT‐TTF) 3 [FeCl 4 ] 2 [BEDT‐TTF = bis(ethylenedithio)tetrathiafulvalene]7b [C 2 mim][FeCl 4 ] (C 2 mim = 1‐methyl‐3‐ethylimidazolium)7c, and [C 4 mim][FeCl 4 ] (C 4 mim = 1‐butyl‐3‐methylimidazolium) 7d. The shortest Fe III ··· Fe III distance is 6.6584(2) Å.…”

Polymorphism in Hybrid Organic−Inorganic Bilayered Magnetic Conductors (BEDT-TTF)3(FeIIICl4)2, BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene

“…Molecules B stack along the a-axis with S 3 3 3 S contacts S9 3 3 3 S9 0 3.632(3) Å , S9 3 3 3 S10 0 3.233(3) Å , and S10 3 3 3 S11 The Fe-Cl bond lengths in I, 2.171(1)-2.186(1) Å and II, 2.177(2)-2.198(2) Å at room-temperature are in the range expected for FeCl 4 -. 7,8,11,13,[26][27][28][29][30][31] As observed in the polymorphic salts κ-BETS 2 FeCl 4 and κ 0 -BETS 2 FeCl 4 , 7,8 the difference between I and II is not only in the donor arrangement, but also in the anion arrangements. The anions in one anionic sheet in I are arranged in a zigzag chain along the c-axis, as in κ 0 -BETS 2 FeCl 4 and in II they are arranged along the b-axis, as in κ-BETS 2 FeCl 4 ( Figure 6).…”

Shubnikov–de Haas oscillations and field-induced anomaly in an organic conductor β″-(EDO-TTFVO)2FeClTeramura1, Yasuzuka2, Yoshino3 et al. 2007Journal of Magnetism and Magnetic MaterialsSelf Cite2000View full textAdd to dashboardCite

“…This new salt of b 00 -type shows the metallic behavior down to 0:3 K and the antiferromagnetic ordering at T N $3 K with an easy axis parallel to the a-axis [5]. In this salt, metallic and antiferromagnetic phases coexist in the ground state.…”