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Infrared electronic absorption in a single-component molecular metal
Authors:Kobayashi Akiko  Sasa Masaaki  Suzuki Wakako  Fujiwara Emiko  Tanaka Hisashi  Tokumoto Madoka  Okano Yoshinori  Fujiwara Hideki  Kobayashi Hayao
Institution:Research Centre for Spectrochemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Abstract:The infrared spectra of the crystal of transition metal complex molecules with extended-TTF ligands, Ni(tmdt)2, which is the first single-component molecular metal that has a stable metallic state even at low temperatures, exhibited an extremely low-energy electronic absorption around 2200 cm-1 (tmdt = trimethylenetetrathiafulvalenedithiolate). The systematic shift of the absorption peaks for molecules similar to Ni(tmdt)2, which range from metallic to semiconducting crystals, shows that the single-component molecular conductors are composed of molecules with unprecedentedly small HOMO-LUMO gaps.
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