Synthesis and properties of dimethyldihydrophenazine radical cation with camphorsulfonate ion

Chiral salts of dimethyldihydrophenazine radical cation with camphorsulfonate ion (1R,4S- and 1S,4R-forms), 1•+•CS–, exhibited solid-state chiroptical properties originating from the associated structures of the radical cation units. In the crystal, the radical cations formed a columnar structure surrounded by CS– ions. The chiral environment induced CD bands in the absorption regions of the radical cation and its associated structures, demonstrating that chirality information can be transferred from the counterions to the radical cation units.