Effect of countercation on the water stability of an anionic metal–organic framework,CrystEngComm

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Effect of countercation on the water stability of an anionic metal–organic framework
CrystEngComm ( IF 2.6 ) Pub Date : 2017-08-25 00:00:00 , DOI: 10.1039/c7ce01228d
A. B. Spore _{1,

2,

3,

4} , N. L. Rosi _{1,

2,

3,

4}

Affiliation

Methods for adjusting and potentially improving the water stability of metal–organic frameworks (MOFs) are important for many potential applications. Herein, we investigate how the identity of uncoordinated countercations housed within the channels of an anionic MOF affect its structure and porosity after exposure to liquid water and water vapour. bMOF-1, Zn₈(ad)₄(BPDC)₆O·2 cations (ad = adeninate; BPDC = biphenyldicarboxylate), was used for this study and different alkylammonium countercations were incorporated into the framework via cation exchange. In general, it was determined that cations having larger alkyl chains resulted in a more water stable bMOF-1 material; conversely, more hydrophilic cations detrimentally affected bMOF-1 stability to water. Finally, bMOF-1 was loaded with mixtures of both hydrophilic and hydrophobic cations. It was found that these bMOF-1 samples, despite the presence of the hydrophilic cations, still maintained their structure and porosity after exposure to water vapour.

中文翻译：

抗衡阳离子对阴离子金属-有机骨架水稳定性的影响

调整和潜在改善金属有机框架（MOF）的水稳定性的方法对于许多潜在应用而言很重要。在这里，我们调查暴露在液态水和水蒸气中后，阴离子MOF通道中容纳的未配位抗衡阳离子的身份如何影响其结构和孔隙率。将bMOF-1 Zn ₈（ad）₄（BPDC）₆ O·2阳离子（ad =腺嘌呤； BPDC =联苯二甲酸）用于本研究，并将不同的烷基铵抗衡阳离子通过阳离子交换掺入骨架中。通常，已确定具有较大烷基链的阳离子导致水稳定性更高的bMOF-1材料; 相反，更多的亲水性阳离子不利地影响bMOF-1对水的稳定性。最后，bMOF-1装有亲水性和疏水性阳离子的混合物。发现这些bMOF-1样品尽管存在亲水性阳离子，但在暴露于水蒸气后仍保持其结构和孔隙率。

更新日期：2017-09-18

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