Tuning of spin density wave strength of Ni(III) complexes with strong electron-correlation

We have succeeded in synthesizing the Ni III complexes doped by Co III ions, [Ni 1-x Co x (chxn) 2 Br]Br 2 (x=0, 0.044, 0.098, 0.118) by using an electrochemical oxidation method. The reflectance spectrum of [Ni 1-x Co x (chxn) 2 Br]Br 2 shows intense charge transfer bands about 0.5eV, which are lower than that of [Ni(chxn) 2 Br]Br 2 . (1.3eV).