Extended Members of the Layered Rare-Earth Hydroxide Family, RE2(OH)5NO3•nH2O (RE = Sm, Eu, and Gd): Synthesis and Anion-Exchange Behavior
Extended Members of the Layered Rare-Earth Hydroxide Family, RE2(OH)5NO3•nH2O (RE = Sm, Eu, and Gd): Synthesis and Anion-Exchange Behavior
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DOI：
10.1002/ejic.200801052
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发表时间：
2009-03-01
影响因子：
2.3
通讯作者：
Byeon, Song-Ho
中科院分区：
文献类型：
--
作者：
Lee, Kyung-Hee;Byeon, Song-Ho
采用水热法合成了三种新型层状稀土氢氧化物RE（OH）（2.5）（NO3）（0.5）中心点xH（2）O（RE = Gd，Eu，Sm）。这些材料对应于RE 2（OH）（5）NO3中心点nH（2）O（RE =稀土系列）家族的扩展成员。虽然有人建议，LRH结构似乎是动力学上有利于钇或（后半部分）的小稀土离子，适当的控制水热反应的pH值条件下，可以扩展这个家庭的较大的稀土离子在本研究中。在稀土层状氢氧化物RE_2（OH）_（5）NO_3中心点nH（2）O（RE = Gd，Eu，Sm）中，成功地进行了NO_3 ~-与一系列有机阴离子（羧酸根、烷基磺酸根和烷基硫酸根）的离子交换反应。FTIR光谱的LRH主机和一些选定的有机阴离子交换衍生物清楚地揭示了硝酸根的情况下，并归因于羧酸根和磺酸根基团的交换反应后的特征带的外观。尽管层间距的大的扩展，层状氢氧化钆和长烷基链阴离子交换衍生物表现出类似的顺磁性行为。(C)Wiley-VCH Verlag GmbH & Co. KGaA，69451魏因海姆，德国，2009）
Three new layered rare-earth hydroxides (LRHs), RE(OH)(2.5)(NO3)(0.5)center dot xH(2)O (RE = Gd, Eu, and Sm), have been prepared by a hydrothermal reaction. These materials correspond to the extended members of the RE2(OH)(5)NO3 center dot nH(2)O (RE = the rare-earth series) family. Although it has been suggested that the LRH structure seems to be kinetically favored by yttrium or (the second half of) the small rare-earth ions, an appropriate control of pH conditions for the hydrothermal reaction could extend this family to the larger rare-earth ions in the present study. The ion-exchange reactions between NO3- and diverse organic anions (a series of organic carboxylates, 1-alkanesulfonates, and alkylsulfates) were successfully carried out in the gallery of layered rare-earth hydroxides, RE2(OH)(5)NO3 center dot nH(2)O (RE = Gd, Eu, and Sm). The FTIR spectra of the LRH hosts and some selected organic anion-exchanged derivatives clearly revealed the absence of nitrate and the appearance of characteristic bands attributed to carboxylate and sulfonate groups after the exchange reactions. Despite a large expansion of interlayer spacing, the layered gadolinium hydroxide and the long alkyl chain anion-exchanged derivative showed a similar paramagnetic behavior. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)