Carrier generation and electronic properties of a single-component pure organic metal
Carrier generation and electronic properties of a single-component pure organic metal
复制标题
DOI：
10.1038/nmat4768
复制
发表时间：
2017-01-01
期刊：
影响因子：
41.2
通讯作者：
Matsushita, Yoshitaka
中科院分区：
文献类型：
--
作者：
Kobayashi, Yuka;Terauchi, Takeshi;Matsushita, Yoshitaka
金属导电通常需要高载流子浓度和宽带宽，这是由原子或分子之间的强轨道相互作用产生的。这些金属盐在有机化合物中特别重要，因为分子基本上是绝缘体;只有具有强分子间相互作用的多组分盐，即只有电荷转移络合物和导电聚合物才表现出固有的金属行为。在这里，我们报告了一个单组分的电活性分子，两性离子四硫富瓦烯（TTF）扩展的二羧酸根（TED），即使在低温下表现出金属导电。TED的直流电导率在300 K时为530 S cm（-1），在50 K时为1，000 S cm（-1），具有类似铜的电子性质。光谱和理论研究的载体产生机制和电子状态的这种单一的分子物种揭示了一个独特的电子结构与自旋密度梯度的扩展TTF部分，成为，在本身，金属状态。
Metallic conduction generally requires high carrier concentration and wide bandwidth derived from strong orbital interaction between atoms or molecules. These requisites are especially important in organic compounds because a molecule is fundamentally an insulator; only multi-component salts with strong intermolecular interaction namely, only charge transfer complexes and conducting polymers have demonstrated intrinsic metallic behaviour. Herein we report a single component electroactive molecule, zwitterionic tetrathiafulvalene(TTF)-extended dicarboxylate radical (TED), exhibiting metallic conduction even at low temperatures. TED exhibits d.c. conductivities of 530 S cm(-1) at 300 K and 1,000 S cm(-1) at 50 K with copper-like electronic properties. Spectroscopic and theoretical investigations of the carrier-generation mechanism and the electronic states of this single molecular species reveal a unique electronic structure with a spin-density gradient in the extended TTF moieties that becomes, in itself, a metallic state.