Six-Fold Coordinated Uranyl Cations in Extended Coordination Polymers

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• 作者：Ionut Mihalcea ; Natacha Henry ; Till Bousquet ; Christophe Volkringer ; Thierry Loiseau
• 刊名：Crystal Growth & Design
• 出版年：2012
• 出版时间：September 5, 2012
• 年：2012
• 卷：12
• 期：9
• 页码：4641-4648
• 全文大小：576K
• 年卷期：v.12,no.9(September 5, 2012)
• ISSN：1528-7505

文摘

Four uranyl-organic framework-type compounds have been hydrothermally synthesized with different ditopic aromatic dicarboxylates. The use of 1,4-benzenedicarboxylate (noted 1,4-bdc), 4,4鈥?biphenyldicarboxylate (noted 4,4鈥?bpdc), 4,4鈥?azobenzenedicarboxylate (noted 4,4鈥?adc), and 1,3-benzenedicarboxylate (noted 1,3-bdc) gave rise to the crystallization of a series of phases UO₂(L) (L = 1,4-bdc (1), 4,4鈥?bpdc (2), 4,4鈥?adc (3), or 1,3-bdc (4)), which exhibited 6-fold coordinated uranyl centers as monomeric square bipyramidal unit. The crystal structures showed that the para position of the carboxylate groups favored the formation of layered extended assemblies in 1鈥?b>3, whereas the meta isomer isophthalate induced the formation of a three-dimensional framework. In situ X-ray diffraction of the thermal behavior indicated the decomposition of the different networks in the range 360鈥?20 掳C, successively followed by the crystallization of the uranium oxide U₃O₈.