Solvent-Induced Reversible Guest Uptake and Release by Flexible Porous Organic Cages

IF 9.6 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Materials Letters Pub Date : 2025-02-18 DOI:10.1021/acsmaterialslett.4c0252210.1021/acsmaterialslett.4c02522

Abdul Ghaffar, Muhammad Bilal Asif, Javeed Mahmood and Cafer T. Yavuz*,

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Abstract

Porous organic cages with intrinsic and extrinsic cavities offer excellent host–guest control, molecular uptake, and on-demand release without compromising the selectivity. However, dynamic control over the porosity in cage molecules remains challenging. Herein, we report a CC3 cage-based crystalline adsorbent with dynamic control over its porosity for stable adsorption and release of the probe organic molecules. Interestingly, the polymorphic forms of cages (α and β) differ in crystallographic packing with flexible orientation but retain their structure after solvation. Using this isomorphism, the CC3 adsorbent exhibited an uptake of 29.5 mg g^–1 for neutral red, 39.5 mg g^–1 for methyl blue, and 39 mg g^–1 for both molecules. The solvent-induced phase transition selectively obstructs neutral red adsorption with 85.5% change in overall capacity. Adsorption affinity correlates strongly with surface area, while solvent choice governs selectivity, highlighting switchable porosity. These findings enable advanced adsorbents with switchable porosity and selective affinity for energy and environmental applications.

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具有内在和外在空腔的多孔有机笼可以在不影响选择性的情况下提供出色的主客控制、分子吸收和按需释放功能。然而，对笼状分子中孔隙率的动态控制仍然具有挑战性。在此，我们报告了一种基于 CC3 笼的晶体吸附剂，该吸附剂可动态控制其孔隙率，以稳定吸附和释放探针有机分子。有趣的是，笼子的多态形式（α 和 β）在晶体学堆积上存在差异，取向灵活，但在溶解后仍保持其结构。利用这种同构性，CC3 吸附剂对中性红的吸附量为 29.5 mg g-1，对甲基蓝的吸附量为 39.5 mg g-1，对两种分子的吸附量均为 39 mg g-1。溶剂引起的相变选择性地阻碍了中性红的吸附，总吸附容量变化了 85.5%。吸附亲和力与表面积密切相关，而溶剂选择则决定了选择性，突出了可切换的孔隙率。这些发现使得具有可切换孔隙率和选择性亲和力的先进吸附剂能够应用于能源和环境领域。

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来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.

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