(BEDT‐TTF)2Cu2(HCOO)5: An Organic–Inorganic Hybrid Conducting Magnet. Issue 3 (19th April 2017) - Zhang, Bin
Abstract: A dual‐functional organic–inorganic hybrid (BEDT‐TTF)2 Cu2 (HCOO)5 (1 ) (BEDT‐TTF=bis(ethylenedithio)tetrathiafulvalene) was obtained through the electrochemical oxidation of neutral BEDT‐TTF in the presence of an ammonium salt of the one‐dimensional copper‐formate framework [(C2 H5 )3 NH]2 Cu2 (HCOO)5 in a C6 H5 Cl–C2 H5 OH solution. Compound 1 was composed of organic donor BEDT‐TTF +0 ⋅ 5 in a θ‐phase arrangement and Jahn–Teller distorted (4, 4) grid anion sheets [Cu2 (HCOO)5 ‐ ] n with S= 1/2. We identified the material as a semiconductor with values of σ 300K =10 −1 S cm −1 . The anion sheet is a coordination isomer of [Cu2 (HCOO)5 ‐ ] n and, compared with the starting material, shows antiferromagnetic behavior as the well‐known inorganic Cu−O, Co−O square layers for creating inorganic conducting magnets. Long‐range antiferromagnetic ordering was observed at 8.0 K. Abstract : Code of conduct : An organic–inorganic hybrid (BEDT‐TTF)2 Cu2 (HCOO)5 composed of a θ‐BEDT‐TTF +0.5 layer and square lattice anionic sheet [Cu2 (HCOO)5 ‐ ] n is synthesized. The crystal shows long‐range magnetic ordering at 8.0 K and is semiconducting with σ rt =0.1 S cm −1 . Thus, an antiferromagnetic square lattice is introduced into a molecular crystal.