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Title
Japanese: 
English:2D Hexagonal Assembly of a Dipolar Rotor with a Close Interval of 0.8 nm Using a Triptycene-Based Supramolecular Scaffold 
Author
Japanese: 小川 竹次郎, 石割 文崇, F. Hajjaj, 庄子 良晃, 梶谷 孝, K. Yazawa, 福島 孝典.  
English: T. Ogawa, F. Ishiwari, F. Hajjaj, Y. Shoji, T. Kajitani, K. Yazawa, T. Fukushima.  
Language English 
Journal/Book name
Japanese: 
English:ChemRxiv 
Volume, Number, Page        
Published date Apr. 12, 2024 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://chemrxiv.org/engage/chemrxiv/article-details/661670f391aefa6ce1406f4c
 
DOI https://doi.org/10.26434/chemrxiv-2024-ws952
Abstract Controlling the rotation of carbon-carbon bonds, which is ubiquitous in organic molecules, to create functionality has been a subject of interest for a long time. In this context, it would be interesting to explore whether cooperative and collective rotation could occur if dipolar molecular rotors were aligned close together while leaving adequate space for rotation. However, it is difficult to realize such structures as bulk assemblies, since molecules generally tend to assemble into a closest packing structure to maximize intermolecular forces. To tackle this question, we examined an approach using a supramolecular scaffold composed of a tripodal triptycene, which has been demonstrated to strongly promote the assembly of various molecular and polymer units into regular “2D hexagonal packing + 1D layer” structures. We found that a molecule (1) consisting of a dipolar 1,2-difluorobenzene rotor sandwiched by two 10-ethynyl-1,8,13-tridodecyloxy triptycenes, successfully self-assembles into the desired structure, where the rotor units align two-dimensionally at a close interval of approximately 0.8 nm while having a degree of freedom for rotational motion. Here we describe the self-assembly behavior of 1 in comparison with the general trend in molecular self-assembly, as well as the motility of the aligned rotors investigated using solid-state 19F-MAS NMR spectroscopy.

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