Tuning of spin density wave strengths in quasi-one-dimensional halogen-bridged Ni(super III) complexes with strong electron correlations, [Ni(super III)(chxn)2X]Y2

A series of quasi-one-dimensional halogen-bridged Ni(super III) complexes were synthesized to determine the effect of the bridging halogens and counteranions on their crystal, electronic structures and spin density wave strengths. Judging by x-ray photoelectron, Auger and reflectance spectra studies, these compounds were not Mott insulators but charge-transfer insulators. The spin density wave strengths were found to be tuned by substituting the bridging halogens and the counteranions.