Structural and Luminescent Properties of Micro- and Nanosized Particles of Lanthanide Terephthalate Coordination Polymers

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• 作者：Carole Daiguebonne ; Nicolas Kerbellec ; Olivier Guillou ; Jean-Claude Bü ; nzli ; Frederic Gumy ; Laure Catala ; Talal Mallah ; Nathalie Audebrand ; Yves Gé ; rault ; Kevin Bernot ; Guillaume Calvez
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：May 5, 2008
• 年：2008
• 卷：47
• 期：9
• 页码：3700 - 3708
• 全文大小：4814K
• 年卷期：v.47,no.9(May 5, 2008)
• ISSN：1520-510X

文摘

Reaction in water between rare earth ions (Ln = Y, La−Tm, except Pm) and the sodium salt of terephthalic acid leads to a family of lanthanide-based coordination polymers of general formula [Ln₂(C₈H₄O₄)₃(H₂O)₄]_n with Ln = La−Tm or Y. The isostructurality of the compounds with the previously reported Tb-containing polymer is ascertained on the basis of their X-ray powder diffraction diagrams. The coordination water molecules can be reversibly removed without destroying the crystal structure for compounds involving one of the lighter lanthanide ions (La−Eu). For compounds involving one of the heavier lanthanide ions (Tb−Tm) or yttrium, a structural change occurs during the drying process. X-ray diffraction data show this new anhydrous phase corresponding to the linking of pairs of Er(III) ions through μ-carboxylate bridges. Porosity profiles calculated for the anhydrous phases of Tb(III) and Er(III) show the presence of channels with very small sections. The luminescent properties of all the compounds have been recorded and the two most luminescent polymers, namely, the europium- and the terbium-containing ones, have been studied in more detail. Tb(III)-containing compounds display large quantum yields, up to 43%. Polyvinylpyrrolidone nanoparticles doped with [Ln₂(C₈H₄O₄)₃(H₂O)₄]_n (Ln = Eu, Tb, Er) have also been synthesized and characterized. The encapsulation of the coordination polymers results in somewhat reduced luminescence intensities and lifetime, but the nanoparticles can be dispersed in water and remain unchanged in this medium for more than 20 h.