Cyclobenzil hydrazones with high iodine capture capacities in solutions and on interfaces
Cyclobenzil hydrazones with high iodine capture capacities in solutions and on interfaces
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DOI：
10.1016/j.xcrp.2023.101509
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发表时间：
2023-07
影响因子：
8.9
通讯作者：
Alexandra Robles;Maymounah Alrayyani;Xiqu Wang;O. Miljanić
中科院分区：
文献类型：
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作者：
Alexandra Robles;Maymounah Alrayyani;Xiqu Wang;O. Miljanić
多孔分子晶体（PMC）是可溶液加工的材料，在薄膜和器件中具有广阔的应用前景。然而，一些 PMC 实际上只是多孔的，因为它们的孔在去溶剂化时会塌陷。我们展示了当非易失性 I2guest 充当探针时虚拟孔隙度的高效使用。我们制备了一系列具有逐渐变大的空腔的环四苯酰腙。与晶体结构预测的值相比，它们测量的表面积高达 131 m2g−1，可以忽略不计。然而，它们可以有效地从水性和有机介质中以及有机-水性界面捕获I2，捕获能力随着虚拟空隙体积的增加而变化。吡啶官能化系统是一个值得注意的异常值，可容纳多达 21 个 I2 分子，并显示出 4.15 g g−1 的捕获能力，这在非聚合物材料中是前所未有的。这些发现可能会影响放射性 I2 的管理，并有助于确保核反应堆和废物安全壳保护涂层的完整性。
Porous molecular crystals (PMCs) are solution-processable materials with promising applications in thin films and devices. However, some PMCs are only virtually porous, as their pores collapse when desolvated. We demonstrate the productive use of virtual porosity when non-volatile I2guest acts as the probe. We prepared a series of cyclotetrabenzil hydrazones with progressively larger cavities. Their measured surface areas of up to 131 m2g−1are negligible compared with the values predicted from crystal structures. Nevertheless, they effectively capture I2from aqueous and organic media and at the organic-aqueous interface, with capture capacities scaling with virtual void volumes. The pyridine-functionalized system is a notable outlier, engaging up to 21 I2molecules and showing capture capacity of 4.15 g g−1, unprecedented among non-polymeric materials. These findings could impact the management of radioactive I2and help in ensuring the integrity of protective coatings of nuclear reactors and waste containment vessels.