A Fluorescent Probe of Nitrite Based on Eu 3+ Functionalized Metal‐Organic Frameworks

Abstract NO 2 − sensing is closely associated with human health, and we adopted lanthanide Eu 3+ post‐modified MOF as NO 2 − fluorescent probes. Typical stable MOF with uncoordinated carboxylic groups in the framework were chosen to encapsulate Eu 3+ . NO 2 − could generate an obvious quenching response to the fluorescence intensity. This Eu 3+ functionalized MOF exhibited excellent fluorescence performances and obvious quenching response to NO 2 − based on the energy transfer between Eu 3+ and NO 2 − . This MOF based NO 2 − fluorescent probe showed a highly splendid detection selectivity and sensitivity with a very low detection limit of 0.69 μM, which was significantly below the maximal level limits of NO 2 − in drinking water set by the WHO.