Chemistry Program, New York University Abu Dhabi (NYUAD), Saadiyat Island, Abu Dhabi, UAE.
NYUAD Water Research Center, New York University Abu Dhabi (NYUAD), Saadiyat Island, Abu Dhabi, UAE.
Nat Commun. 2022 Jul 7;13(1):3904. doi: 10.1038/s41467-022-31393-2.
Ionic covalent organic frameworks (iCOFs) are new examples of porous materials and have shown great potential for various applications. When functionalized with suitable emission sites, guest uptake via the ionic moieties of iCOFs can cause a significant change in luminescence, making them excellent candidates for chemosensors. In here, we present a luminescence sensor in the form of an ionic covalent organic framework (TGH•PD) composed of guanidinium and phenanthroline moieties for the detection of ammonia and primary aliphatic amines. TGH•PD exhibits strong emission enhancement in the presence of selective primary amines due to the suppression of intramolecular charge transfer (ICT) with an ultra-low detection limit of 1.2 × 10 M for ammonia. The presence of ionic moieties makes TGH•PD highly dispersible in water, while deprotonation of the guanidinium moiety by amines restricts its ICT process and signals their presence by enhanced fluorescence emission. The presence of ordered pore walls introduces size selectivity among analyte molecules, and the iCOF has been successfully used to monitor meat products that release biogenic amine vapors upon decomposition due to improper storage.
离子共价有机骨架（iCOFs）是多孔材料的新实例，在各种应用中显示出巨大的潜力。当用合适的发光位点功能化时，iCOFs 的离子部分的客体摄取会导致发光的显著变化，使它们成为化学传感器的优秀候选物。在这里，我们提出了一种形式为离子共价有机骨架（TGH•PD）的荧光传感器，它由胍和菲咯啉部分组成，用于检测氨和伯脂肪胺。由于抑制了分子内电荷转移（ICT），TGH•PD 在存在选择性伯胺时表现出强烈的发射增强，其对氨的检测限低至 1.2×10 M。离子部分的存在使 TGH•PD 在水中高度分散，而伯胺使胍部分去质子化，限制了其 ICT 过程，并通过增强的荧光发射信号指示其存在。有序的孔壁在分析物分子之间引入了尺寸选择性，并且该 iCOF 已成功用于监测由于储存不当而在分解时释放生物胺蒸气的肉类产品。
