Coordination Polymer Submicrospheres: Fast Microwave Synthesis and Their Conversion under Different Atmospheres

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• 作者：Shengliang Zhong ; Hongyu Jing ; Yuan Li ; Shungao Yin ; Chenghui Zeng ; Lei Wang
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：August 18, 2014
• 年：2014
• 卷：53
• 期：16
• 页码：8278-8286
• 全文大小：547K
• ISSN：1520-510X

文摘

Rare earth (RE) based coordination polymer (CP) submicrospheres have been prepared from pyridine-2,5-dicarboxylic acid and RE(NO₃)₃ via a facile microwave heating method in 5 min, with N,N-dimethylformamide (DMF) as solvent. The submicrospheres have diameters of 100鈥?00 nm. Furthermore, the surface of the microspheres is smooth and the microspheres are solid. Several CP submicrospheres (RE = La, Gd, Y) were selected and calcined under different atmospheres (including air, N₂, and NH₃). After calcination in air at 550 掳C for 4 h, rare earth oxide (RE₂O₃) submicrospheres were obtained. On calcination under an N₂ atmosphere, LaN/La₂O₃/C composite spheres were obtained for La-based CPs. For Gd(Y)-based CPs, Gd₂O₃(Y₂O₃)/C composite spheres were obtained. Porous carbon submicrospheres were obtained after the removal of RE₂O₃ and REN from the composite spheres. Interestingly, under an NH₃ atmosphere, La₂O₂CN₂ submicrospheres were produced from the La-based CPs. In addition, the Gd-based and Y-based CPs submicrospheres gave Gd₂O₃/GdN/C and Y₂O₃/C submicrospheres, respectively. As examples of their potential applications, their upconversion properties and electrochemical properties of the as-prepared products were investigated. This facile microwave synthesis method may offer an attractive approach for the preparation of other RE-CP micro-/nanostructures, and many interesting materials may be derived.