J. Phys. IV France
Volume 114, April 2004
Page(s) 419 - 424

J. Phys. IV France
114 (2004) 419
DOI: 10.1051/jp4:2004114100

Recent progress in development of single-component molecular metals

A. Kobayashi1, 1, E. Fujiwara1, W. Suzuki1, M. Sasa1, Y. Fujishiro2, E. Nishibori2, M. Takata2, M. Sakata2, Y. Okano3, H. Fujiwara3 and H. Kobayashi3

1  Research Centre for Spectrochemistry, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2  Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
3  Institute for Molecular Science and CREST, JST, Myodaiji, Okazaki 444-8585, Japan

The novel nickel complex with the extended-TTF dithiolate ligand [ Ni(tmdt) 2] (tmdt=trimethylene dithiotetrathiafulvalenedithiolate) is the first three-dimensional single-component molecular metal with metallic state down to very low temperature (0.6 K). Recently, the direct evidence for presence of electron and hole Fermi surfaces in [ Ni(tmdt) 2] was obtained by detecting the de Haars-van Alphen (dHvA) effect. We have synthesized analogous single-component molecular conductors with various ligands and central metal atoms and examined their structures and physical properties. The visible and ir spectra of single-component molecular conductors showed that these molecules have unprecedentedly small HOMO-LUMO gaps. Key words. Single-component molecular metal - dithiolene complex - extended-TTF ligand.

© EDP Sciences 2004