Magnetic and Electric Properties of a Cation Radical Salt Tris(decacyclene) Bis(hexafluorophosphate), (Dc)3(PF6)2

Abstract

Abstract A cation radical salt between a π-electron donor decacyclene and hexafluorophosphate, (Dc)3(PF6)2, was prepared by electrochemical synthesis, and conductivity (90–350 K), electron paramagnetic resonance (4–400 K) and static susceptibility (2–300 K) were measured. The salt was found to be semiconductive with the conductivity of ca. 4×10−2 S cm−1 at room tempertature and the activation energy of 66±3 meV. The magnetic measurements show that this salt is paramagnetic and spin susceptibility is thermally activated with the activation energy of 17 meV resulting from antiferromagnetic intermolecular interaction, although the dication of electron donor might be expected to have triplet spin multiplicity to stabilize ferromagnetic spin alignment in the ground state. The magnetism of (Dc)3(PF6)2 is discussed in terms of charge-transfer interaction among donors.