Zhang Zhe, Wang Heng, Shi Junjuan, Wang Pingshan, Liu Changlin, Wang Ming, Li Xiaopeng
Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Environmental Research at Great Bay, Guangzhou University, Guangzhou 510006, P R. China.
Department of Chemistry, University of South Florida, Tampa 33620, United States.
Isr J Chem. 2019 Mar;59(3-4):237-247. doi: 10.1002/ijch.201800070. Epub 2018 Aug 24.
Snowflake, a highly symmetrical hexagram figure, is challenging to be expressed by chemistry/supramolecular chemistry due to the complex structure. Herein, we have constructed super snowflake supramolecules using terpyridine (tpy)-based metal-organic building blocks with <tpy-Ru(II)-tpy> and <tpy-Zn(II)-tpy> connectivities through stepwise strategies in high yield. The structures were characterized by multi-dimensional mass spectrometry and multi-dimensional NMR spectrometry. In order to address the stability/tolerance of our designed super snowflake structures, ligand exchange behaviors between different supramolecules with various arm length were fully investigated by mass spectrometry. The study revealed that three modes could exist in such binary systems, including full exchange, partial exchange and self-sorting (no exchange) depending on the length difference of ligands.
雪花，一种高度对称的六边形图形，由于其结构复杂，很难用化学/超分子化学来表示。在此，我们通过逐步策略，以高产率构建了具有<tpy-Ru(II)-tpy>和<tpy-Zn(II)-tpy>连接性的基于三联吡啶（tpy）的金属有机构建块的超级雪花超分子。通过多维质谱和多维核磁共振光谱对结构进行了表征。为了研究我们设计的超级雪花结构的稳定性/耐受性，通过质谱全面研究了不同臂长的超分子之间的配体交换行为。研究表明，在这种二元体系中可能存在三种模式，包括完全交换、部分交换和自分类（无交换），这取决于配体的长度差异。
