三联烯
化学
绕固定轴旋转
旋转(数学)
位阻效应
分子几何学
平面的
分子
结晶学
分子物理学
立体化学
经典力学
几何学
高分子化学
有机化学
数学
计算机科学
物理
计算机图形学(图像)
作者
Tomoki Furuta,Kouki Oka,Norimitsu Tohnai
标识
DOI:10.1093/bulcsj/uoae013
摘要
Abstract Molecular rotors are one of the building blocks of molecular machines and they are nano-sized with mechanically rotating moieties. Among them, intermeshing triptycenes with a gear-like skeleton allow the construction of a molecular rotor that transmits rotational motion. For triptycenes to mesh with each other without loss of rotation, intermeshing them in parallel and adjusting the distance between their axes to 8.1 Å are required. However, with conventional methods, because of the restrictions on bond lengths and atomic radii, achieving an ideal arrangement in which the triptycenes mesh in parallel at 8.1 Å has been difficult. In this work, we synthesized disulfonic acid containing a triptycene as a rotator and combined it with amines of 2 different steric factors (normal-amylamine [nAmA] and guanidine [Gu]), which allowed us to prepare organic salts with varying arrangements of triptycenes. In the organic salt with the planar amine (Gu), the crystal structure was close to the ideal intermeshing arrangement of the triptycene and the distance between their axes was 7.7 Å. The T1ρ 13C spin-lattice relaxation time using solid-state nuclear magnetic resonance (NMR) demonstrated that triptycene rotates efficiently at 24 kHz at 313 K with a low rotational barrier (10.9 kcal/mol) compared with non-intermeshing structures.
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