Tetra-Nuclear Cluster-Based Lanthanide Metal-Organic Frameworks as White Phosphor, Information Encryption, Self-Calibrating Thermometers, and Fe 2+ Sensors

The application of one kind of metal-organic framework (MOF) material used in multiple fields is one of the most interesting research topics. In this work, four new tetra-nuclear cluster-based lanthanide metal-organic frameworks (LnMOFs) [Ln (BTDB) (DMA)(phen)] (Ln = Tb , Eu , Gd , Tb Eu , 3,5-bis(trifluoromethyl)-4',4″-dicarboxytriphenylamine = , 1,10-phenanthroline = phen) are obtained based on the ligand of that is synthesized in our laboratory, and the precise single-crystal structure of is obtained for the first time. The white phosphor was obtained by facilely hybridizing two components of the orange-yellow emission phosphor of and the blue luminescence material of triphenylamine according to the trichromatic theory. At the same time, , , , and the white phosphor can be used for information encryption, demonstrating their potential application in the field of anti-counterfeiting. is also a multi-mode and self-calibrating thermometer within a broad temperature range of 110-300 K. Further studies show that is a rapid response sensor for Fe , with a very low limit of detection of 2.0 nM, which is much lower than the national standards for Fe (GB 5749-2005, 5.357 μM). It can achieve strong anti-interference detection of Fe in actual samples of tap water and lake water. In addition, can also be made into an easy-to-use sensing device of test paper for real-time and visual sensing of Fe .