BEDT-TTF)2Cu2(HCOO)5: An Organic-Inorganic Hybrid Conducting Magnet

A dual-functional organic-inorganic hybrid (BEDTTTF) Cu-2(2)( 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 [(C2H5)(3)NH](2)Cu-2(HCOO)(5) in a C6H5Cl-C2H5OH solution. Compound 1 was composed of organic donor BEDT-TTF+0.5 in a qphase arrangement and Jahn- Teller distorted (4,4) grid anion sheets [Cu-2(HCOO)(5)-]n with S=1/2. We identified the material as a semiconductor with values of sigma 300K= 10(-1) Scm(-1). The anion sheet is a coordination isomer of [Cu-2(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.