Synthesis, Structure and Near Infrared Fluorescence Property of a New Nd-MOF Based on a Triangular Benzylamine Ligand

A new 3D metal–organic framework (Nd-MOF) {[Nd 2 L 2 ]·2NH 2 (CH 3 ) 2 ·3H 2 O} was successfully established via a solvothermal method with Nd 3+ ion and 5-(bis(4-carboxybenzyl) amino)–isophthalicacid (H 4 L), and has also been characterized by X-ray diffraction, powder X-ray diffraction (PXRD), IR and photoluminescence(PL)spectrum. The neodymium ions are free of coordinated solvents, and the Nd-MOF exhibits strong near-infrared (NIR) fluorescence. Besides, Its NIR fluorescence property shows low temperature resistance, which is favorable for being used in the low temperature environment. Besides, the fluorescence lifetime of Nd-MOF is 6.03 μs, and the quantum yield is 1.2%. The small quantum yield may owe to large energy gap between the T1 of the ligand H 4 L and the resonance energy level 4 F 3/2 of the Nd 3+ ion, or due to large crystal size of the Nd-MOF. Graphical Abstract