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莫比乌斯篮子分子:结构与性质。

Möbius basket molecule: structure and properties.

机构信息

State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun, 130023, China.

出版信息

Phys Chem Chem Phys. 2010 Aug 21;12(31):8847-55. doi: 10.1039/b927344a. Epub 2010 Jun 8.

Abstract

Expanding the non-knot region of the famous Möbius strip with topological one-sided characteristics, an interesting structure of a Möbius basket molecule with all real frequencies was obtained at the B3LYP/6-31G(d) level for the first time. This structure contains six fused five-membered pyrrole rings contrasting with the isolated pentagon rule for the fullerenes. The twisted handle joints the outer and inner surfaces of the bowl to form a one-sided container molecule. Comparing the Möbius basket to its isomers of a Möbius strip and a normal basket, the framework shape effects on the structure and properties are systematically exhibited. Especially, (1) the basket-making effect increases kinetic stability (the HOMO-LUMO gap increases from 1.116 eV for Möbius strip to 1.608 eV for Möbius basket); (2) from the normal basket to the Möbius basket, the twisting effect obviously increases the static first hyperpolarizability (from 2836 to 3773 au) and IP (from 6.622 to 6.857 eV). It is found that the aza atom, knot, the bowl, and the combination of the knot and bowl units are important regulating factors for the charge transfer (CT) direction in the crucial transitions. This provides the possibility to control the charge transfer direction in crucial transitions by variation of the structures, which is important for the designs of the new optical and photoelectric materials and devices with good performances.

摘要

利用拓扑单侧特性扩展著名的 Möbius 带的非纽结区域,首次在 B3LYP/6-31G(d)水平上获得了具有所有实频率的 Möbius 篮分子的有趣结构。该结构包含六个融合的五元吡咯环,与富勒烯的孤立五边形规则形成鲜明对比。扭曲的手柄连接碗的内外表面,形成单侧容器分子。将 Möbius 篮与其 Möbius 带和正常篮的异构体进行比较,系统地展示了骨架形状对结构和性质的影响。特别是:(1)篮子制作效应增加了动力学稳定性(HOMO-LUMO 间隙从 Möbius 带的 1.116 eV 增加到 Möbius 篮的 1.608 eV);(2)从正常篮到 Möbius 篮,扭曲效应明显增加了静态第一超极化率(从 2836 增加到 3773 au)和 IP(从 6.622 增加到 6.857 eV)。发现氮原子、纽结、碗以及纽结和碗单元的组合是关键跃迁中电荷转移(CT)方向的重要调节因素。这为通过结构变化控制关键跃迁中的电荷转移方向提供了可能性,对于设计具有良好性能的新型光电材料和器件非常重要。

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