A purely organic paramagnetic metal, κ-β″-(BEDT-TTF) 2(PO-CONHC2H4SO3), where PO = 2,2,5,5-tetramethyl-3-pyrrolin-1-oxyl free radical

Article abstract of DOI:10.1021/cm100984z

A novel bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF)-based purely organic paramagnetic conducting salt that contains the aminoxyl radical was prepared. Five BEDT-TTF salts containing the TEMPO radical were prepared. An anion with the even smaller PO (2, 2, 5, 5-tetramethyl-3-pyrrolin-1-oxyl) radical was also prepared. The sulfonic acid H2 was prepared by reacting 3-carboxy-2, 2, 5, 5-tetramethyl pyrrolin-1-oxyl (PO-COOH) with 2-aminoethanesulfonic acid mmol) in the presence of DCC and DMAP in 30 mL of CH₂Cl₂. Single-crystal X-ray diffraction data for PPh ₄2 were collected using a Quantum CCD area detector and a Rigaku AFC-7R diffractometer. Black needlelike crystals of k-β''-(BEDT-TTF) ₂(POCONHC₂H₄SO₃), were obtained by the conventional constant-current electrocrystallization method in a mixed solvent of PhCl and CH₃CN with 15 mg of BEDT-TTF and 70 mg of PPh₄2. The salt is metallic down to 1.7K, indicating a stable metal.