Zeolitic imidazolate framework-22: high hydrophilicity, water resistance, and proton conduction

IF 4.6 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Nanoscale Advances Pub Date : 2025-08-08 DOI:10.1039/D5NA00686D

Hiroi Sei, Hitoshi Kasai and Kouki Oka

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Abstract

Among metal–organic frameworks (MOFs), zeolitic imidazolate frameworks (ZIFs) enable precise design of pore structures, and most of them exhibit high water resistance. However, no hydrophilic ZIF that maintains water resistance and adsorbs water vapor in low-pressure range has been achieved. In the current work, as a MOF with both high structural stability and hydrophilicity, we focused on ZIF-22 that contains one polar uncoordinated N-heteroatom in its organic linker. ZIF-22 exhibited high water resistance due to presence of an appropriate number (one) of uncoordinated N-heteroatoms. The added polarity from N-heteroatoms allowed ZIF-22 to exhibit the highest hydrophilicity among ZIFs. Furthermore, ZIF-22 exhibited the highest proton conductivity (1.77 × 10⁻³ S cm⁻¹ at 363 K and 95% RH) among ZIFs without acidic groups or guest proton carriers. These findings provide a design strategy of MOFs that achieve hydrophilization while maintaining water resistance and broaden their application range in aqueous environments.

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沸石咪唑酸框架-22：高亲水性，耐水性和质子传导。

在金属有机骨架（mof）中，沸石咪唑盐骨架（ZIFs）能够精确设计孔隙结构，并且大多数具有较高的耐水性。然而，在低压范围内保持水阻力并吸附水蒸气的亲水性ZIF尚未实现。在目前的工作中，作为一种具有高结构稳定性和亲水性的MOF，我们重点研究了在其有机连接体中含有一个极性非配位n杂原子的ZIF-22。ZIF-22由于存在适当数量（1个）的非配位n杂原子而表现出较高的耐水性。来自n杂原子的附加极性使得ZIF-22在zif中表现出最高的亲水性。此外，在没有酸性基团和客体质子载体的ZIF-22中，ZIF-22的质子电导率最高（在363 K和95% RH下为1.77 × 10-3 S cm-1）。这些发现为mof提供了一种既能实现亲水性又能保持耐水性的设计策略，拓宽了mof在水环境中的应用范围。

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