Ma Teng, He Xingyue, Liu Xiao, Qiu Xiao-Hang, Ma Jian-Gong, Cheng Peng
Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry (MOE), Frontiers Science Center for New Organic Matter, and Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, P. R. China.
Inorg Chem. 2024 Sep 23;63(38):17946-17954. doi: 10.1021/acs.inorgchem.4c03396. Epub 2024 Sep 12.
Pollution of surface water by heavy metal hexavalent chromium ions poses a serious threat to human health; herein, a two-dimensional (2D) cationic breathing Ni-MOF with free nitrate ions between the layers was designed and synthesized according to the characteristics of hexavalent chromium ions, {Ni(L)·5HO} (L = 1,3,5-tris[4-(imidazol-1-yl)phenyl]benzene). The flexible layer spacing of the 2D breathing Ni-MOF allows the exchange of NO by CrO without destroying the original structure. Electrostatic and hydrogen bonding interactions between CrO and Ni-MOF facilitate its exchange with NO. Moreover, CrO exhibits a higher binding energy with Ni-MOF compared to NO, and the hydrophobic channels of Ni-MOF favor CrO trapping due to its lower hydration energy. Consequently, Ni-MOF demonstrates both effective sorption and electrochemical sensing of Cr(VI), achieving a sensitivity of 2.091 μA μM and a detection limit of 0.07 μM.
