New Organic Conductor Containing Magnetic Ion of Cu(II): α″-(BEDT-TTF)2KCu(SCN)4

New organic conductor containing pπ-d electrons, α″-(BEDT-TTF)2 KCu(SCN)4, is eventually prepared. The calculated band structure is one-dimensional along the donor stacking direction. The electrical conductivity at room temperature is 0.5 Scm−1 with the activation energy of 0.09 eV. The magnetic susceptibility is an addition of a Curie contribution of Cu(II) and an organic pπ part. The susceptibility of the pπ part does not follow the simple one-dimensional Heisenberg model.