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用电化学结晶方法合成出一种新的导电分子晶体(BEDT-TTF)_2HgCl_3·TCE,[(BEDT-TTF)=双亚乙基二硫四硫富瓦烯,TCE=1,1,2-三氯乙烷].用四圆X衍射方法确定了它的晶体结构,测得(BEDT-TTF)_2HgCl_3·TCE单晶在bc平面的ln(R/R_0)与T~(-1)呈线性关系.(BEDT-TTF)_2HgCl_3·TCE晶体中,(BEDT-TTF)~(+0.5)阳离子自由基沿b方向等距并肩排列,由S…S分子间相互作用维系,形成一维导电结构;阴离子(HgCl_3)~-也沿b方向形成一维聚合体(HgCl_3)_n~(n-),因而(BEDT-TTF)_2HgCl_3·TCE属一维半导体.为了研究导电分子晶体的导电性与结构的关系,制备了有机超导体β-(BEDT-TTF)_2I_3,讨论了β-(BEDT-TTF)_2I_3的导电性优于(BEDT-TTF)_2HgCl_3·TCE的结构原因.
A novel conductive molecular crystal (BEDT-TTF) _2HgCl_3 · TCE [(BEDT-TTF) = bis-ethylene disulfide tetrathiafulvalene with TCE = 1,1,2- Trichloroethane] .It was determined by four-circle X-ray diffraction. The crystal structure of (BEDT-TTF) _2HgCl_3 · TCE single crystal was linear with T ~ (-1) in the bc plane (BEDT-TTF) _2HgCl_3 · TCE crystal, the (BEDT-TTF) ~ (+0.5) cation radicals are arranged side by side along the b direction and are coordinated by the interaction of S ... S molecules to form a one-dimensional conductive structure; (HgCl_3) _n ~ (n-) forms along the b direction, and (BEDT-TTF) _2HgCl_3 · TCE belongs to a one-dimensional semiconductor.In order to study the conductivity and structure of the conductive molecules (BEDT-TTF) _2I_3 was prepared. The structural reason for the superior conductivity of (BEDT-TTF) _2I_3 to (BEDT-TTF) _2HgCl_3 · TCE was discussed.