Synthesis of eight isostructural 2D lanthanide coordination polymers assembled by rigid furan-2, 5-dicarboxylic acid and flexible adipic acid as linkers and exploration of luminescent Eu/Tb polymers as efficient and sensitive sensors for nitroaromatic compounds. (6th May 2020) - Nisa, Zaib ul
Abstract : Eight isostructural coordination polymers were synthesized by a solvothermal method. The luminescent Eu/Tb polymers function as efficient sensors for nitroaromatics via turn-off mode. Abstract : Detection of hazardous chemicals is crucial for a healthy and safe environment as well as for the well-being of humans. A confluence of chemistry and engineering continues to improve the sensitivity and selectivity for several classes of harmful chemicals with the promise of cheap and portable sensing. Herein, following the function-oriented research strategy, eight novel lanthanide coordination polymers (Ln-CPs) have been successfully assembled with the framework composition [Ln(2, 5-FDC)0.5 (Adip)(H2 O)2 ] (Ln = Nd (1 ), Sm (2 ), Eu (3 ), Gd (4 ), Tb (5 ), Dy (6 ), Ho (7 ), Er (8 ), 2, 5-FDC 2− = furan-2, 5-dicarboxylate, Adip 2− = Adipate) under solvothermal synthesis conditions. The structural analysis indicates that all the eight CPs have the same structural features. All compounds crystallize in the orthorhombic crystal system (space group Pnma ) with point symbol {3 3 ·4 4 ·5 3 } and consist of 2D cem topological type. The linkers 2, 5-FDC 2− and Adip 2− exhibit μ2 -κ 4, η 1 :η 1 :η 1 :η 1 and μ3 -κ 5, η 2 :η 1 :η 1 :η 1 coordination modes respectively. The as-synthesized polymers were characterized by powder X-ray crystallography, infrared spectroscopy, thermogravimetric analysis, and photoluminescence studies. CP-3 and CP-5 are promising luminescent lanthanide coordination polymers (Ln-CPs) and function as efficient sensors for the detection of nitroaromatic compounds at the ppm level in mix N, N ′-dimethyl formamide-aqueous medium via the luminescence quenching mechanism.