Synergistic Construction of Lanthanide Coordination Supramolecular Framework through Coordination Bonds and π–π Stacking Interactions for Visible Blue-Red Ratio Luminescence Detection of D 2 O

In scientific research, the application of D₂O has been limited by the requirement of high purity for a long time, so it is of great significance to develop methods for D₂O detection. Based on the factors of energy transfer between ligand and lanthanide ions, and the correlation between the vibration frequency of the D-O bond and H-O bond and the luminescence of Ln-CP, we designed and successfully prepared a three-dimensional coordination supramolecular framework EuL, which was assembled by coordination bond and π-π stacking interaction. A series of D₂O luminescence detection analysis showed that EuL could realize the qualitative and quantitative detection of D₂O content in H₂O. Unlike the green-yellow or yellow-orange ratio luminescence changes of most Ln-CP luminescence sensors, the blue-red ratio luminescence of EuL makes its visible luminescence more obvious. In addition, in order to further improve the convenience and reusability of EuL as a luminescence sensor, we also prepared EuL@PMMA, which has been proven to be a fast and economical D₂O detector in practical applications. This work will provide some experience and reference for the expansion of D₂O detection materials and the development of new ratio luminescent sensing materials with significant changes in light color.