Suresh Venkata M, Bandyopadhyay Arkamita, Roy Syamantak, Pati Swapan K, Maji Tapas Kumar
Molecular Materials Laboratory, Chemistry and Physics of Materials Unit (CPMU), Bangalore-560064 (India).
New Chemistry Unit (NCU), Bangalore-560064 (India).
Chemistry. 2015 Jul 20;21(30):10799-804. doi: 10.1002/chem.201500406. Epub 2015 Jun 12.
Reversible and selective capture/detection of F(-) ions in water is of the utmost importance, as excess intake leads to adverse effects on human health. Highly robust Lewis acidic luminescent porous organic materials have potential for efficient sequestration and detection of F(-) ions. Herein, the rational design and synthesis of a boron-based, Lewis acidic microporous organic polymer (BMOP) derived from tris(4-bromo-2,3,5,6-tetramethylphenyl)boron nodes and diethynylbiphenyl linkers with a pore size of 1.08 nm for selective turn-on sensing and capture of F(-) ion are reported. The presence of a vacant pπ orbital on the boron center of BMOP results in intramolecular charge transfer (ICT) from the linker to boron. BMOP shows selective turn-on blue emission for F(-) ions in aqueous mixtures with a detection limit of 2.6 μM. Strong B-F interactions facilitate rapid sequestration of F(-) by BMOP. The ICT emission of BMOP can be reversibly regenerated by addition of an excess of water, and the polymer can be reused several times.
水中氟离子的可逆和选择性捕获/检测至关重要，因为过量摄入会对人体健康产生不利影响。高度稳健的路易斯酸性发光多孔有机材料具有有效螯合和检测氟离子的潜力。在此，报道了一种基于硼的路易斯酸性微孔有机聚合物（BMOP）的合理设计与合成，该聚合物由三（4-溴-2,3,5,6-四甲基苯基）硼节点和二乙炔基联苯连接体衍生而来，孔径为1.08 nm，用于选择性开启传感和捕获氟离子。BMOP硼中心上的空pπ轨道导致分子内从连接体到硼的电荷转移（ICT）。BMOP在水性混合物中对氟离子表现出选择性开启蓝色发射，检测限为2.6 μM。强大的B-F相互作用促进了BMOP对氟离子的快速螯合。通过加入过量的水，BMOP的ICT发射可以可逆地再生，并且该聚合物可以重复使用几次。
