Electronic structure of the quasi-one-dimensional halogen-bridged Ni complexes [Ni(chxX(X=Cl, Br) and related Ni compounds

H. Okamoto, Y. Shimada, Y. Oka, A. Chainani, T. Takahashi

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102 Citations (Scopus)


The electronic structure of the one-dimensional Ni complexes, [Ni(chxn(Formula presented)X](Formula presented)(X=Cl, Br; (chxn)=1R,2R-cyclohexanediamine), is studied together with the discrete Ni complexes, [Ni(Formula presented)([14](Formula presented))](Formula presented)(X=Cl; Br;([14](Formula presented))=1,4,8,11-tetraazacyclote tradecane), using optical spectroscopy, x-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy. The optical spectra show that the Br compounds have a smaller gap as compared with the Cl compounds. An analysis using a simple X-Ni-X trimer model on the optical spectra and the Ni 2p XP spectra yields quantitative estimates for the charge transfer (CT) energy Δ and the transfer energy T for discrete and one-dimensional Ni complexes. The analysis on the Ni LVV Auger spectra in conjunction with the valence XP spectra indicates that the average on-side d-d Coulomb energy U in the one-dimensional and discrete Ni complexes is about 5 eV, quite similar to the case of the Ni dihalides. The obtained results demonstrate that the one-dimensional Ni complexes are CT insulators. We discuss the differences in the electronic structures of the one-dimensional Ni complexes compared with the Ni dihalides and the one-dimensional Pt complexes on the basis of the estimated parameter values of Δ, T, and U.

Original languageEnglish
Pages (from-to)8438-8445
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number12
Publication statusPublished - 1996


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