Turn-on and Ratiometric Luminescent Sensing of Hydrogen Sulfide Based on Metal–Organic Frameworks

著者: Xin Zhang, Quan Hu, Tifeng Xia, Jun Zhang, Yu Zhu Yang, Yuanjing Cui, Banglin Chen, Guodong Qian - ACS Applied Materials & Interfaces 2016 被引用: 241

The sensing of hydrogen sulfide (H 2 S) has become a long-time challenging task. In this work, we developed a general strategy for sensing of H 2 S utilizing postsynthetic modification of a nano metal–organic frameworks (MOF) UiO-66-(COOH) 2 with Eu 3+ and Cu 2+ ions. The nano MOF Eu 3+ /Cu 2+ @UiO-66-(COOH) 2 displays the characteristic Eu 3+ sharp emissions and the broad ligand-centered (LC) emission simultaneously. Because H 2 S can strongly increase the fluorescence of Eu 3+ and quench the broad LC emission through its superior affinity for Cu 2+ ions, the MOF Eu 3+ /Cu 2+ @UiO-66-(COOH) 2 exhibits highly sensitive turn-on sensing of H 2 S over other environmentally and biologically relevant species under physiological conditions. Furthermore, this approach for fluorescent turn-on sensing of H 2 S is expected to extend to other water-stable MOFs containing uncoordinated −COOH.