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首页> 外文期刊>Chemistry: A European journal >A Compact Tetrathiafulvalene–Benzothiadiazole Dyad and Its Highly Symmetrical Charge-Transfer Salt: Ordered Donor p-Stacks Closely Bound to Their Acceptors
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A Compact Tetrathiafulvalene–Benzothiadiazole Dyad and Its Highly Symmetrical Charge-Transfer Salt: Ordered Donor p-Stacks Closely Bound to Their Acceptors

机译：紧凑的四硫富瓦烯-苯并噻二唑二联体及其高度对称的电荷转移盐：有序供体p堆紧密绑定到其受体。

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摘要

A compact and planar donor–acceptor molecule 1 comprising tetrathiafulvalene (TTF) and benzothiadiazole (BTD) units has been synthesised and experimentally characterised by structural, optical, and electrochemical methods. Solution-processed and thermally evaporated thin films of 1 have also been explored as active materials in organic field-effect transistors (OFETs). For these devices, hole fieldeffect mobilities of μ_(FE)=(1.3±0.5)×10~(-3) and (2.7±0.4)× 10~(-3) cm~2Vs~(-1) were determined for the solution-processed and thermally evaporated thin films, respectively. An intense intramolecular charge-transfer (ICT) transition at around 495 nm dominates the optical absorption spectrum of the neutral dyad, which also shows a weak emission from its ICT state. The iodine-induced oxidation of 1 leads to a partially oxidised crystalline charge-transfer (CT) salt {(1)_2I_3}, and eventually also to a fully oxidised compound {1I_3}·(1/2)I_2. Single crystals of the former CT compound, exhibiting a highly symmetrical crystal structure, reveal a fairly good room temperature electrical conductivity of the order of 2 Scm~(-1). The onedimensional spin system bears compactly bonded BTD acceptors (spatial localisation of the LUMO) along its ridge.
机译：包含四硫富富瓦烯（TTF）和苯并噻二唑（BTD）单元的致密且平面的供体-受体分子1已合成，并通过结构，光学和电化学方法进行了实验表征。在有机场效应晶体管（OFET）中，还研究了固溶处理和热蒸发的1薄膜作为活性材料。对于这些器件，确定了μ_（FE）=（1.3±0.5）×10〜（-3）和（2.7±0.4）×10〜（-3）cm〜2Vs〜（-1）的空穴场迁移率。固溶处理和热蒸发的薄膜。大约495 nm处的强烈分子内电荷转移（ICT）跃迁主导了中性二元组的光吸收光谱，这也显示了其ICT状态的微弱发射。碘诱导的1氧化会导致部分氧化的晶体电荷转移（CT）盐{（1）_2I_3}，最终还会导致完全氧化的化合物{1I_3}·（1/2）I_2。前一种CT化合物的单晶具有高度对称的晶体结构，具有相当好的室温电导率，约为2 Scm〜（-1）。一维自旋系统沿其脊部带有紧密结合的BTD受体（LUMO的空间定位）。

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