Manifold dynamic non-covalent interactions for steering molecular assembly and cyclization. Issue 35 (25th August 2021)

• Record Type: Journal Article
• Authors: Song, Shaotang; Wang, Lulu; Su, Jie; Xu, Zhen; Hsu, Chia-Hsiu; Hua, Chenqiang; Lyu, Pin; Li, Jing; Peng, Xinnan; Kojima, Takahiro; Nobusue, Shunpei; Telychko, Mykola; Zheng, Yi; Chuang, Feng-Chuan; Sakaguchi, Hiroshi; Wong, Ming Wah; Lu, Jiong
• Is Part Of: Chemical science. Volume 12:Issue 35(2021)
• Page Start: 11659
• Page End: 11667
• Publication Date: 2021-08-25
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1sc03733a
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : A real-space characterization of dynamic non-covalent interactions in molecular assemblies and chemical reactions at the atomic bond level. Abstract : Deciphering rich non-covalent interactions that govern many chemical and biological processes is crucial for the design of drugs and controlling molecular assemblies and their chemical transformations. However, real-space characterization of these weak interactions in complex molecular architectures at the single bond level has been a longstanding challenge. Here, we employed bond-resolved scanning probe microscopy combined with an exhaustive structural search algorithm and quantum chemistry calculations to elucidate multiple non-covalent interactions that control the cohesive molecular clustering of well-designed precursor molecules and their chemical reactions. The presence of two flexible bromo-triphenyl moieties in the precursor leads to the assembly of distinct non-planar dimer and trimer clusters by manifold non-covalent interactions, including hydrogen bonding, halogen bonding, C–H⋯π and lone pair⋯π interactions. The dynamic nature of weak interactions allows for transforming dimers into energetically more favourable trimers as molecular density increases. The formation of trimers also facilitates thermally-triggered intermolecular Ullmann coupling reactions, while the disassembly of dimers favours intramolecular cyclization, as evidenced by bond-resolved imaging of metalorganic intermediates and final products. The richness of manifold non-covalent interactions offers unprecedented opportunities for controlling the assembly of complex molecular architectures and steering on-surface synthesis of quantum nanostructures.