Tuning of electronic structures of quasi-one-dimensional bromo-bridged Ni(III) complexes with strong electron-correlation by doping of Co(III) ions, [Ni(1-x)Co(x)(Chxn)(2)Br]Br(2)

M Yamashita; K Yokoyama; S Furukawa; T Manabe; T Ono; K Nakata; C Kachi-Terajima; F Iwahori; T Ishii; H Miyasaka; K Sugiura; H Matsuzaki; H Kishida; H Okamoto; H Tanaka; Y Hasegawa; K Marumoto; H Ito; S Kuroda

doi:10.1021/ic011326r

Tuning of electronic structures of quasi-one-dimensional bromo-bridged Ni(III) complexes with strong electron-correlation by doping of Co(III) ions, [Ni(1-x)Co(x)(Chxn)(2)Br]Br(2)

Inorg Chem. 2002 Apr 22;41(8):1998-2000. doi: 10.1021/ic011326r.

Authors

Affiliation

¹ Graduate School of Science, Tokyo Metropolitan University and PRESTO (JST), 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan. yamashit@comp.metro-u.ac.jp

PMID: 11952350
DOI: 10.1021/ic011326r

Abstract

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, 0.043, 0.093, and 0.118) by using an electrochemical oxidation method. The single-crystal reflectance spectrum of x = 0.118 shows an intense CT band about 0.5 eV, which is lower than that of [Ni(chxn)(2)Br]Br(2) (1.3 eV). The single-crystal electrical conductivities at room temperature of these compounds increase with increase of the amounts of doping of Co(III) ions. In the ESR spectra, peak-to-peak line widths DeltaH(pp) at room temperature change about 600 G in [Ni(chxn)(2)Br]Br(2) to 200 G in x = 0.118. Such a large x dependence of DeltaH(pp) seems to be ascribed to the increasing contribution from the increasing Curie spins which have smaller line width. Therefore, we have tuned the electronic structures of quasi-one-dimensional bromo-bridged Ni(III) complexes with strong electron correlations by doping of Co(III) ions.