Europium-Based Metal–Organic Framework as a Dual Luminescence Sensor for the Selective Detection of the Phosphate Anion and Fe³⁺ Ion in Aqueous Media

A new three-dimensional europium-based metal–organic framework has been synthesized with the newly designed ligand L (6-[1-(4-carboxyphenyl)-1H-1,2,3-triazol-4-yl]­nicotinic acid). This compound acts as a dual sensor for the phosphate anion and Fe3+ ion in aqueous media. The mechanistic aspect of this selectivity and sensitivity was explored through several spectroscopic methods and then correlated with the corresponding structure