Multifunctional chemical sensors and luminescent thermometers based on lanthanide metal organic framework materials
Six new highly symmetrical and isostructural 3D lanthanide metal organic frameworks (Ln MOFs) [Ln2(Ccbp)3*6H2O]*3Cl *4H2O} Ln Tb (1) Eu (2) Gd (3) Sm (4) Er (5) and Yb (6) Ccbp 4 carboxy 1 (4 carboxybenzyl)pyridinium, and the mixed Ln MOF [Tb1.828Eu0.172(Ccbp)3*6H2O]*3Cl *4H2O} (7) have been successfully synthesized and fully characterized. The complex 1 was utilized as a representative chemosensor to detect small molecules, cations and anions, respectively. Interestingly, 1 exhibited dual functional detection of Pb2+ and Fe3+ ions in ethanol with excellent linear variation to quantify the corresponding concentration change. In addition, the temperature dependent luminescence properties of 1, 2 and 7 have also been investigated systematically, which demonstrated that both 1 and 7 have potential to quantitatively detect temperature as a luminescent thermometer over a wide range from 10 300 K for 1 and 10 170 K for 7. Thus, the as obtained Ln MOF materials have potential to serve as the first examples of a multifunctional luminescent sensor for quantitatively detecting the temperature (10 300 K) and the concentration of Pb2+ and Fe3+ ions in ethanol solution.