Luminescent lanthanide oxalatophosphites with a 3D framework structure: Ln(H₂O)(C₂O₄)_0.5(HPO ₃)·H₂O (Ln = Pr, Nd, and Sm-Lu)

The synthesis, structural characterization, thermal stability, guest desorption-sorption, luminescence, and catalytic properties of a series of lanthanide oxalatophosphites,were studied. The redhydration pattern at 150°C shows that the sample compound remains crystalline after loss of lattice water and the integrity of the framework is not affected by the water release. The layered cerium phosphite reported different coordination modes of the phosphate groups in the cerium compound. The emission spectrum of the lanthanide oxalatophosphites are found to excite at 392 nm, exhibiting the characteristic bands of metal ions in the visible regions. The results also indicate that the lanthanide triflates can efficiently catalyze the Biginelli reaction under mild conditions and the structure of lanthanide oxalatophosphites allow incorporation of second type of lanthanide ions.