Antiferromagnetic fluctuation of (EDT-TTF)4CoCl4( 1, 1, 2-TCE)x

The new series of EDT-TTF salts containing the magnetic anion havebeen prepared and the crystal structure analyses andphysical property measurements have been performed Especially (EDT-TTF)4CoCl4(l,1, 2-TCE)x is metallic down to 80K, where the ESR linewidth increases and the g-value deviates from the constant value. It suggests that the dipole-dipole interaction of d- and πelectrons in the title compound transforms the linewidth and g-value behaviors. The anomalies at 35K and 15K might be caused by intrinsic instability in π-electrons.