Antiferromagnetic Organic Metal Exhibiting Superconducting Transition, κ-(BETS)₂FeBr₄ [BETS = Bis(ethylenedithio)tetraselenafulvalene]

Organic Antiferromagnetic Metals Exhibiting Superconducting Transitions κ-(BETS)2FeX4 (X=Cl, Br): Drastic Effect of Halogen Substitution on the Successive Phase Transitions

“…The susceptibilities of -(BETS) FeBr were obtained using oriented crystals, while the randomly oriented polycrystalline sample was used for -(BETS) FeCl . As was reported brie#y (13,15), -(BETS) FeBr undergoes a magnetic phase transition and become a metallic antiferromagnet below 2.5 K ("¹ , ) (12,13). The cusp around ¹ , and the branches below ¹ , clearly show the existence of long-range order as shown in Fig.…”

The Highly Conducting Spin-Crossover Compound Combining Fe(III) Cation Complex with TCNQ in a Fractional Reduction State. Synthesis, Structure, Electric and Magnetic Properties

“…In such materials, conductivity is associated with mobile electrons in organic layers, whereas magnetism usually originates from localized spins of transition metal ions in insulating counterion layers. In particular, salts of BEDT-TTF and its selenium-substituted derivative bis(ethylenedithio)tetraselenafulvalene (BETS) have been shown to combine (super)conducting and paramagnetic [7][8][9][10] and even antiferromagnetic [11,12] and ferromagnetic properties [13]. Moreover, interaction between localized spins in insulating magnetic layers and itinerant spins in conducting organic layers was found to lead to new fascinating phenomena such as field-induced superconductivity observed on λ-(BETS) 2 FeCl 4 [14] and κ-(BETS) 2 FeBr 4 [15].…”

The Electronic Structure and Spectroscopy of Metallo‐Dithiolene Complexes

“…Numerous metallo-dithiolenes have been synthesized and, depending on the choice of the transition metal and the nature of the dithiolene, possess lumophoric (249)(250)(251)(252)(253)(254)(255)(256)(257)(258)(259)(260)(261)(262)(263)(264)(265) magnetic (113,114,120,143,145,158,159,163,191,192,199,203,211,213,215,216,218,266,267), and conducting properties (111, 113, 121, 123, 124, 130-133, 136-138, 144, 155, 158, 159, 173, 175, 183, 185, 189-191, 193-195, 197, 198, 201-203, 205, 206, 217-219, 240, 241, 268-279). Perhaps the most fascinating function of transition metal dithiolenes is their ability to catalyze a variety of formal oxygen atom transfer (OAT) reactions in specific model systems and at the active sites of pyranopterin molybdenum and tungsten enzymes.…”