A dual emission metal–organic framework for rapid ratiometric fluorescence detection of CO32? in seawater

摘要

A dual emission metal–organic framework (IRMOF-10-Eu) was prepared and used as a ratiometric fluorescent sensor for CO _(3) ~(2?) detection. IRMOF-10-Eu had good stability and excellent luminescence in aqueous solution. IRMOF-10-Eu showed dual fluorescence emission from the ligand and Eu ~(3+) with single excitation. Upon treatment with CO _(3) ~(2?) , the fluorescence ratio ( I _(624) / I _(358) ) of the probe displayed significant change. The relative fluorescence intensity ratio ( I _(624) / I _(358) ) and CO _(3) ~(2?) concentration had a linear relationship in 50–300 μM range with a low detection limit of 9.58 μM. And the luminescence probe of CO _(3) ~(2?) showed a fast detection time. The possible mechanism was investigated. CO _(3) ~(2?) changed the structure of IRMOF-10-Eu and interrupted the energy transfer process. Thus, the fluorescence emission intensity of the ligand was increased and Eu ~(3+) was decreased with the addition of CO _(3) ~(2?) . IRMOF-10-Eu was used to detect CO _(3) ~(2?) in seawater, which showed good prospect in practical application. Subsequently, a highly selective and sensitive probe, IRMOF-10-Eu, may pave an efficient way for CO _(3) ~(2?) detection in seawater.