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

• Published in: New journal of chemistry 2020-05, Vol.44 (19), p.8125-8137
• Main Authors: Nisa, Zaib ul, Tashi, Lobzang, Sen, Charanjeet, Ashashi, Nargis Akhter, Sahoo, Subash Chandra, Sheikh, Haq Nawaz
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Coordination polymers; Crystal structure; Crystallography; Dicarboxylic acids; Dimethylformamide; Erbium; Gadolinium; Infrared analysis; Luminescence quenching; Photoluminescence; Polymers; Selectivity; Sensors; Structural analysis; Thermogravimetric analysis
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d0nj01018a

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)(H 2 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 μ 2 -κ 4 ,η 1 :η 1 :η 1 :η 1 and μ 3 -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. 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.