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Updated: Jun 5, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Evolution from [Zn9] to a record-high [Zn54] subblock and engineering a hierarchical supramolecular framework for
Ye Tao1, Qiubing Dong2, Jingmeng Wan3
1State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmaceutical Sciences, Guangxi Normal University Guilin 541004 China huangfp2010@163.com zmh@mailbox.gxnu.edu.cn.
Abstract:
Hierarchical supramolecular frameworks are being designed and constructed for various applications, yet the controlled assembly and process understanding incorporating giant building blocks remains a great challenge. Here, we report a strategy of "rivet" substitution and "hinge" linkage for the controlled assembly of the hierarchical supramolecular framework. The replacement of two "rivet" ethylene glycol (EG) molecules for triangular prism [Zn9] (a small block in 1) with a 1,3-propanediol (PDO) provides space for a "hinge" linkage from adjacent ligands, thus providing a hierarchical (from micro- to mesopores, from the internal cavity to external surface) supramolecular framework (2) based on a coordinative subblock with the record number of zinc ions ([Zn54]). Time-dependent powder X-ray diffraction and ESI-MS technology were used to assess the in situ evolution process: logically progressing from [Zn9] to [Zn18], then to [Zn27], and finally to [Zn54]. The sequential transformation entails two types of half-opening cavities and two types of internal microcages. Further aggregation of [Zn54] in dia topology engenders the formation of a one-dimensional channel (10 Å), and an additional mesocage with a volume of 16 × 16 × 55 Å3. The diverse pore system exhibits an impressive uptake capability (3.19 g g-1) for iodine vapor at 75 °C and effective ethylene purification. Our investigations represent a valuable avenue for assembling a giant subblock and hierarchical supramolecular framework, facilitating multi-functional molecular accommodation.
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