Synthesis, Structural Characterization, and Guest Exchange Properties of Hydrogen-Bonded Organic Frameworks Based on Bis(benzimidazole)ZnCl2 Complexes
Synthesis, Structural Characterization, and Guest Exchange Properties of Hydrogen-Bonded Organic Frameworks Based on Bis(benzimidazole)ZnCl2 Complexes
复制标题
基于双(苯并咪唑)ZnCl2配合物的氢键有机框架的合成、结构表征和客体交换性能
DOI：
10.1021/acs.inorgchem.2c03131
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发表时间：
2022
影响因子：
4.6
通讯作者：
Ohta Shun
中科院分区：
文献类型：
--
作者：
Iwabuchi Yurika;Yamaguchi Ryoga;Murakami Tatsunari;Okazaki Masaaki;Ohta Shun
基于配位化合物的氢键有机骨架材料是一类新兴的多孔材料。在这里，我们报告的合成，晶体结构，和客体交换性能的四个HOFs的基础上的锌二氯配合物，带有双（苯并咪唑基）甲烷配体（双（苯并咪唑）氯化锌）。这些双（苯并咪唑）ZnCl 2基HOF的多孔结构主要由分子间N-H···Cl氢键和π-π相互作用组成。其中一个HOFs被发现交换客体分子通过单晶到单晶的转变，有或没有结构变化。单晶X射线衍射研究表明，客体交换过程是由双苯并咪唑ZnCl 2配合物之间的N-H···Cl氢键断裂，与客体分子形成交替氢键引起的.该结果表明，使用比通常用于构建HOF的那些更弱的N-H···Cl氢键（例如，羧酸二聚体、N-杂环和电荷辅助部分）可以代表合成柔性HOF的便利策略。
Hydrogen-bonded organic frameworks (HOFs) based on coordination compounds constitute a developing class of interesting porous materials. Herein, we report on the synthesis, crystal structures, and guest exchange properties of four HOFs based on zinc dichlorido complexes that bear a bis(benzimidazolyl)methane ligand (bis(benzimidazole)ZnCl2). The porous structures of these bis(benzimidazole)ZnCl2-based HOFs are characterized predominantly by intermolecular N–H···Cl hydrogen bonds in conjunction with π–π interactions. One of these HOFs was found to exchange guest moleculesviasingle-crystal-to-single-crystal transformations with or without structural change. A single-crystal X-ray diffraction study revealed that the guest exchange accompanied by a structural change is induced by the cleavage of the N–H···Cl hydrogen bonds between the bis(benzimidazole)ZnCl2complexes, followed by the formation of alternate hydrogen bonds with guest molecules. This result suggests that the use of weaker N–H···Cl hydrogen bonds than those typically used for the construction of HOFs (e.g., carboxylic acid dimers, N-heterocycles, and charge-assisted moieties) may represent a convenient strategy to synthesize flexible HOFs.