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Updated: Feb 22, 2026
Fabrication of Spatially Confined Complex Oxides
Published on: July 1, 2013
Inter-cluster distance dependence of electrical properties in single crystals of a mixed-valence polyoxometalate
Ryo Tsunashima1, Ippei Nakamura, Rika Oue
1Graduate School of Science and Engineering & Graduate School of Science and Engineering for Innovation, Yamaguchi University, Yoshida 1677-1, Yamaguchi, 753-8512, Japan. ryotsuna@yamaguchi-u.ac.jp.
Abstract:
The electrical conductivity of mixed-valence [MoMoO54(SO3)2]6- tetraalkylammonium salts was investigated through dependence on the inter-cluster distance that is controlled by tetraethylammonium, tetrapropylammonium, and tetrabutylammonium cations. The crystallographic analysis of single crystals revealed that the inter-cluster distances are dependent on the chain length of the alkyl groups on the counter cations. In addition, the electrical conductivities of the single crystals were found to be dependent on both temperature and chain length. Mixed-valence polyoxometalate (POM) clusters are considered to be a molecular particle of Mo bronze by which highly ordered networks will be developed using single crystals, where POMs are rather small and have a well-organized structure compared to colloidal nanostructures.
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