Enrichment of nitro-aromatic compounds (NACs) and radioactive iodine seriously threatens the health of humans, therefore, trace detection of NACs and the efficient capture and storage of radioactive iodine have attracted a great deal of attention in recent years. Herein, we present two highly efficient flexible DADM-based covalent organic frameworks (DADM-based COFs) for the fluorescence sensing of -nitrophenol (-NP) and p-nitrophenol (-NP) and reversible iodine capture, namely TDADM and HDADM. The resulting TDADM and HDADM have excellent thermal and chemical stability, some crystallinity and high BET surface areas of 1035 and 958 m g, respectively. For fluorescence sensing, TDADM and HDADM show high sensitivity to -NP and -NP with quenching constants (Ksv) of 6.77 × 10 and 3.39 × 10 L mol, respectively. The fluorescence quenching of TDADM is caused by the action of photo-induced electron transfer (PET) processes. The fluorescence quenching of HDADM is caused by the co-action of PET and resonance energy transfer (RET) processes. For iodine capture, TDADM and HDADM exhibit high iodine capture capacities, which are severally up to 4.08 and 5.32 g g. Such high iodine adsorption amounts are caused by the electron transfer of the electron-rich flexible DADM-based COFs to the electron-deficient I into the polyiodide anion complexes.

中文翻译：

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由柔性结和4,4'-二氨基二苯甲烷作为连接体构建的基于DADM的柔性共价有机框架，用于荧光传感硝基苯酚和吸附碘

硝基芳香族化合物（NACs）和放射性碘的富集严重威胁人类健康，因此，NACs的痕量检测以及放射性碘的高效捕获和储存近年来引起了人们的广泛关注。在此，我们提出了两种高效灵活的基于 DADM 的共价有机框架（基于 DADM 的 COF），用于对硝基苯酚（-NP）和对硝基苯酚（-NP）的荧光传感以及可逆的碘捕获，即 TDADM 和 HDADM。所得的 TDADM 和 HDADM 具有优异的热稳定性和化学稳定性、一定的结晶度以及分别为 1035 和 958 m g 的高 BET 表面积。对于荧光传感，TDADM 和 HDADM 对 -NP 和 -NP 显示出高灵敏度，猝灭常数 (Ksv) 分别为 6.77 × 10 L mol 和 3.39 × 10 L mol。 TDADM 的荧光猝灭是由光诱导电子转移 (PET) 过程的作用引起的。 HDADM 的荧光猝灭是由 PET 和共振能量转移 (RET) 过程的共同作用引起的。对于碘捕获，TDADM和HDADM表现出较高的碘捕获能力，分别高达4.08和5.32 g g。如此高的碘吸附量是由富电子柔性 DADM 基 COF 的电子转移到缺电子 I 进入聚碘阴离子络合物引起的。