Used nuclear fuel reprocessing represents a unique challenge when dealing with radionuclides such as isotopes of ⁸⁵Kr and ¹²⁹I₂ due to their volatility and long half-life. Efficient capture of ¹²⁹I₂ (t_1/2 = 15.7 × 10⁶ years) from the nuclear waste stream can help reduce the risk of releasing I₂ radionuclide into the environment and/or potential incorporation into the human thyroid. Metal organic frameworks have the reported potential to be I₂ adsorbents but the effect of water vapor, generally present in the reprocessing off-gas stream, is rarely taken into account. Moisture-stable porous metal organic frameworks that can selectively adsorb I₂ in the presence of water vapor are thus of great interest. Herein, we report on the I₂ adsorption capacity of two microporous metal organic frameworks at both dry and humid conditions. Single-crystal X-ray diffraction and Raman spectroscopy reveal distinct sorption sites of molecular I₂ within the pores in proximity to the phenyl- and phenol-based linkers stabilized by the I···π and I···O interactions, which allow selective uptake of iodine.

中文翻译：

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湿度条件下金属有机骨架中碘的吸附

在处理放射性核素（例如⁸⁵ Kr和¹²⁹ I _2的同位素）时，由于其挥发性和半衰期长，用过的核燃料后处理构成了一个独特的挑战。从核废料流中有效捕获¹²⁹ I ₂（t _1/2 = 15.7×10 ⁶年）可以帮助降低将I ₂放射性核素释放到环境中和/或潜在掺入人体甲状腺的风险。金属有机骨架的潜在潜力为I ₂吸附剂，但很少考虑通常存在于后处理废气流中的水蒸气的影响。因此，在水蒸气存在下能够选择性地吸附I _2的水分稳定的多孔金属有机骨架引起了人们的极大兴趣。在此，我们报道了两种微孔金属有机骨架在干燥和潮湿条件下的I ₂吸附能力。单晶X射线衍射和拉曼光谱揭示了分子中I _2的独特吸附位点，这些分子位于通过I··π和I···O相互作用稳定的苯基和酚基连接基附近。选择性摄取碘。