Luminescence Changeable CO2‐Storage Cylinder: Triple‐Stranded Helical Eu(III)/Tb(III) Fluorinated MOFs with Amide Linkers

Triple‐stranded helical lanthanide MOFs with CO2 adsorption properties were investigated. Lanthanide MOFs ([Eu0.1Tb0.9(hfa)3(dpa)]n) are composed of lanthanide luminophores (Eu(III) and/or Tb(III) ions), fluorinated antenna ligands (hfa: hexafluoroacetylacetonate), and polyamide‐type linker ligands (dpa: 4‐(diphenylphosphoryl)‐N‐(4‐(diphenylphosphoryl)phenyl)benzamide). The cylindrical structure was characterized by single‐crystal X‐ray analysis, thermogravimetric analysis, and gas adsorption measurements. The inner surfaces of the cylindrical channels were covered with the fluorine atoms of the hfa ligands. The emission intensity ratio (IEu/ITb) in [Eu0.1Tb0.9(hfa)3(dpa)]n is affected by the CO2 gas adsorption behavior. The change in IEu/ITb value was caused by the intermolecular interactions between the CO2 gas molecules and the fluorinated ligands, resulting in an electronic structural change of the lowest triplet excited state in the photosensitized hfa ligands. Novel lanthanide MOFs with CO2 gas adsorption are demonstrated. The MOFs constructed a cylindrical structure. The inner channel of the cylindrical structure was covered with fluorine atoms. The fluorine atoms enhance interaction with CO2 gas molecules. Eu/Tb‐mixed MOFs exhibited the change of ratiometric emission intensity between Eu and Tb by CO2 gas adsorption behavior.