Tetramerized Structure of (DMET)<sub>2</sub>ReO<sub>4</sub>and Its Apparent Metallic Behavior in Resistivity
作者:Kazuya Saito、Yoshimitsu Ishikawa、Masayoshi Ishibashi、Koichi Kikuchi、Keiji Kobayashi、Isao Ikemoto
DOI:10.1246/bcsj.63.1865
日期:1990.7
The crystal structure of (DMET)2ReO4 (DMET: 5,6-dihydro-2-(4,5-dimethyl-1,3-diselenol-2-ylidene)dithiolo[4,5-b][1,4]dithiin) was determined, and its resisitivity and thermoelectric power were measured. Crystal data; (C10H10S4Se2)2·ReO4, Mr=1082.88, triclinic, P\bar1, a=6.715(1) Å, b=14.486(2) Å, c=15.867(2) Å, α=101.95(4)°, β=90.05(1)°, γ=78.43(1)°, V=1478.2(3) Å3, Z=2, Dx=2.43 Mg m−3, μ(Mo Kα)=9.62 mm−1, F(000)=1022, T=297 K, R=0.074 for 4391 reflections. The crystal has columnar structure. In the column, a large degree of tetramerization is observed. The resistivity under the normal pressure has metallic temperature dependence above ca. 295 K. The thermoelectric power is essentially constant above 200 K and no anomaly was detected around 295 K. The apparent metallic behavior was attributed to the small activation energy (band-gap) and the temperature dependence of the carrier mobility.
已测定(DMET)2ReO4(DMET:5,6-二氢-2-(4,5-二甲基-1,3-二硒醇-2-亚基)二硫醇[4,5-b][1,4]二硫杂环戊烯)的水晶结构,并测量了其电阻率和热电功率。晶体数据;(C10H10S4Se2)2·ReO4,Mr=1082.88,三斜晶,P\bar1,a=6.715(1) Å,b=14.486(2) Å,c=15.867(2) Å,α=101.95(4)°,β=90.05(1)°,γ=78.43(1)°,V=1478.2(3) Å3,Z=2,Dx=2.43 Mg m−3,μ(Mo Kα)=9.62 mm−1,F(000)=1022,T=297 K,R=0.074,4391个反射。该晶体具有柱状结构。在柱状结构中,观察到大量四聚现象。在常压下,电阻率在约295 K