The cerium(III) coordination polymer with mixed polycarboxylic acids. Preparation of the CeO₂ nanoparticles by thermal decomposition of the polymer

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• 作者：Reza Mohammadinasab ; Masoumeh Tabatabaee ; Boris-Marko Kukovec ; Hossein Aghaie
• 关键词：Coordination polymer ; Cerium(III) ; CeO2 nanoparticles ; Benzene-1 ; 2 ; 4 ; 5-tetracarboxylic acid ; Pyridine-2 ; 6-dicarboxylic acid
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：24 August, 2013
• 年：2013
• 卷：405
• 期：Complete
• 页码：368-373
• 全文大小：1480 K

文摘

A treatment of benzene-1,2,4,5-tetracarboxylic acid (H₄btc) and pyridine-2,6-dicarboxylic acid (H₂pydc) with Ce(NO₃)₃¡¤6H₂O (in the molar ratio 1:1:2) under hydrothermal conditions led to the formation of a new 1D cerium(III) coordination polymer {[(pydc)₂Ce₂(¦Ì-H₂btc)(H₂O)₆]¡¤4H₂O}_n (1). Compound 1 was characterized by infrared spectroscopy, elemental analyses and by X-ray diffraction studies. The polymeric chain of 1 contains cerium(III) ions bridged by H₂btc^2? ligand. Each H₂btc^2? ion is connected to four cerium(III) ions via its two bidentate and bridging carboxylate groups. Cerium(III) ion is nine-coordinated by three oxygen atoms from two different H₂btc^2? ligands, two oxygen atoms and one nitrogen atom from the tridentate pydc^2? ligand and three coordinated water molecules, resulting with a distorted tricapped trigonal prismatic arrangement. Many hydrogen bonds of the O-H?O type are also present in the crystal structure of 1 and assemble the polymeric chains and the co-crystallized water molecules into a 3D architecture. The coordination polymer 1 was used for the preparation of the CeO₂ nanoparticles. Synthesized CeO₂ nanoparticles were characterized by infrared spectroscopy, powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). The face-centered cubic structure of CeO₂ was determined by PXRD.