Mott-hubbard state in one-dimensional iodo-bridged binuclear metal dithioacetato complexes, M2(dta)4I (M=Pt and Ni)

M. Yamashita, Y. Wada, K. Toriumi, T. Mitani

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36 Citations (Scopus)

Abstract

Polarized reflection, electrical conductivity, magnetic susceptibility measurements and X-ray crystal structure redetermination have been carried out on one — dimensional iodo-bridged binuclear metal dithioacetato complexes, M2(dta)4| (M=Pt and Ni; dta=CH3CS2) in order to elucidate their electronic property. The chain structure consists of -M2.5+-M2.5+-|-M2.5+-M2.5+ - with no Peierls distortion, and two metal atoms in binuclear moieties are bridged by four dithioacetato ligands to give a cage structure. The magnetic behavior of these compounds revealed very strong antiferromagnetic coupling between electronic spins (S=1/2) localized on the M-M dimers. They show semiconducting behavior with high conductivities and small activation energies compared with those of the MX compounds. From these results, it may be concluded that the compounds are one-dimensional Mott-Hubbard insulators, in contrast to Peierls insulators of R4[Pt2(pop)4X].nH20 complexes (…M2+-M2+…X-M3+-M3+-X.).

Original languageEnglish
Pages (from-to)207-212
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
Volume216
Issue number1
DOIs
Publication statusPublished - 1992 Jun 1

ASJC Scopus subject areas

  • Condensed Matter Physics

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