Dual-Ligand Strategy Employing Rigid 2,5-Thiophenedicarboxylate and 1,10-Phenanthroline as Coligands for Solvothermal Synthesis of Eight Lanthanide(III) Coordination Polymers: Structural Diversity, DFT Study, and Exploration of the Luminescent Tb(III) Coordination Polymer as an Efficient Chemical Sensor for Nitroaromatic Compounds.

Lanthanide coordination polymers (Ln-CPs) are potential chemosensors when fabricated to depict a detectable change in optical properties on interaction with target analytes. This work investigates the interaction of nitroaromatic compounds with Ln-CPs leading to induced changes in fluorescence emission intensity, a crucial strategy to develop a selective and sensitive system for the sensing of nitroaromatics. Approaching toward this objective, solvothermal reactions of 2,5-thiophenedicarboxylic (2,5-TDC) acid, 1,10-phenanthroline (1,10-Phen), and Ln(NO)·HO are carried out to assemble eight Ln(III) coordination polymers [Ln(2,5-TDC)(1,10-Phen)(HO)] [Ln = Pr (), Nd ()], {[Tb(2,5-TDC)(1,10-Phen)(HO)]·DMF} (), and [Ln(2,5-TDC)(1,10-Phen)]·HO (Ln = Tb (), Dy (), Ho (), Er (), and Yb ()); = 0 for CP , , , and and = 1 for CP with two different space groups and dimensions.

PEI functionalized NaCeF:Tb/Eu for photoluminescence sensing of heavy metal ions and explosive aromatic nitro compounds.

This work reports an eco-friendly hydrothermal approach for the synthesis of hexagonal NaCeF:Tb/Eu nanophosphors. The phase, morphology and optical properties were characterized by Powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy and photoluminescence (PL) spectroscopy respectively. Herein, the as-synthesized nanophosphor was functionalized with amine rich polyethylenimine (PEI) resulting in development of a luminescent nanoprobe bearing dual sensing functions for hazardous nitroaromatics and heavy metal ions.