Infrared electronic absorption in a single-component molecular metal.
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.
Kobayashi
Akiko
A
Research Centre for Spectrochemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Sasa
Masaaki
M
Suzuki
Wakako
W
Fujiwara
Emiko
E
Tanaka
Hisashi
H
Tokumoto
Madoka
M
Okano
Yoshinori
Y
Fujiwara
Hideki
H
Kobayashi
Hayao
H