Synthesis, characterization and photoluminescence properties of two new europium(III) coordination polymers with 3D open framework

✍ Scribed by Guoqi Zhang; Qian Wang; Yan Qian; Guoqiang Yang; Jin Shi Ma

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 476 KB
• Volume: 796
• Category: Article
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2006.01.048

✦ Synopsis

The 3D open framework coordination polymers, [Eu 2 (fum) 3 (H 2 O) 4 ] n $3nH 2 O (1, fumZfumaric acid) and [Eu(pdc)(Hpdc)] n (2, pdcZpyridine-2,5-dicarboxylic acid) have been synthesized via hydrothermal procedure. Their molecular structures were determined by single-crystal X-ray diffraction analysis. Polymer 1 adopts a 3D microporous structure filled with disordered free water molecules which interact by hydrogen bonds with terminal water bound to the metal centers. IR spectroscopy, TGA and powder X-ray diffraction analysis revealed that the remarkable dehydration-rehydration process of open-framework 1 is completely reversible. Polymer 2 forms a 3D framework composed of 2D grid-like inorganic subnetworks and pdc ligands as linkers. This solid is highly stable up to 405 8C. The solid-state photoluminescence measurements exhibited red light-emitting characteristic of two europium(III) coordination polymers. Moreover, the anhydrous products were found to be more strongly fluorescent and be of longer lifetime.