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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Magnetic single-component molecular conductors exhibiting strong π-d interactions
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Magnetic single-component molecular conductors exhibiting strong π-d interactions

机译:具有强π-d相互作用的磁性单组分分子导体

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Single-component molecular conductors [M(tmdt)_2] (tmdt = trimethylenetetrathiafulvalenedithiolate; M = Ni, Au, Pt, Cu), exhibit a variety of electromagnetic properties, which originate from the differences of the metal's d-orbitals role in the band structure formation. The [Au(tmdt) _2] crystal undergoes an antiferromagnetic transition at 110 K, while maintaining a metallic state at lower temperatures. The Au analog has a high magnetic transition temperature as compared to traditional magnetic molecular conductors due to the strong three-dimensional (3-D) structure and the contribution of the metal d-orbitals. The single-component molecular conductor, [Cu(tmdt)_2], with π- and d-like frontier orbitals is isostructural with other metallic [M(tmdt)_2] systems (M = Ni, Pt, Au). The Cu(tmdt)_2 molecule is planar, which strikingly contrasts the tetrahedral coordination of Cu(dmdt)_2 (dmdt = dimethyltetrathiafulvalenedithiolate) with similarly extended TTF type ligands. Interestingly, unlike other [M(tmdt)_2] with metallic behavior, [Cu(tmdt)_2] shows semiconducting behavior at room temperature (σ(RT) = ~7 S cm-1). The RT conductivity increased linearly with increased pressure to 110 S cm~(-1) at 15 kbar despite the compressed pellet sample. The magnetic susceptibility indicates one-dimensional (1-D) Heisenberg behavior with J = 117 cm~(-1) and shows antiferromagnetic ordering at 13 K. The [Cu(tmdt)_2] is a new multi-frontier π-d system, which introduces a d(σ)-type frontier orbital around the Fermi level of the π-like metal bands.
机译:单组分分子导体[M(tmdt)_2](tmdt =三亚甲基四硫代富二烯丙基硫醇盐; M = Ni,Au,Pt,Cu)具有多种电磁特性,这是由于金属在谱带中的d轨道作用不同而引起的。结构形成。 [Au(tmdt)_2]晶体在110 K下经历反铁磁跃迁,同时在较低温度下保持金属态。由于具有强大的三维(3-D)结构和金属d轨道的作用,与传统的磁性分子导体相比,Au模拟物具有较高的磁性转变温度。具有π和d类前沿轨道的单组分分子导体[Cu(tmdt)_2]与其他金属[M(tmdt)_2]系统(M = Ni,Pt,Au)是同构的。 Cu(tmdt)_2分子是平面的,这与具有类似扩展的TTF型配体的Cu(dmdt)_2(dmdt =甲基四硫富瓦烯二硫代二甲基)的四面体配位形成鲜明对比。有趣的是,与其他具有金属行为的[M(tmdt)_2]不同,[Cu(tmdt)_2]在室温下表现出半导体行为(σ(RT)=〜7 S cm-1)。尽管压缩了颗粒样品,但RT电导率随着压力的增加而线性增加,在15 kbar时达到110 S cm〜(-1)。磁化率表示J = 117 cm〜(-1)的一维(1-D)Heisenberg行为,并在13 K下显示反铁磁有序性。[Cu(tmdt)_2]是一个新的多边界π-d系统,在π型金属带的费米能级附近引入ad(σ)型边界轨道。

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