...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Comparative investigation of the solution species [U(CO3)(5)](6-) and the crystal structure of Na-6[U(CO3)(5)]center dot 12H(2)O
【24h】

Comparative investigation of the solution species [U(CO3)(5)](6-) and the crystal structure of Na-6[U(CO3)(5)]center dot 12H(2)O

机译：溶液种类[U（CO3）（5）]（6-）与Na-6 [U（CO3）（5）]中心点12H（2）O的晶体结构的比较研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The limiting U(IV) carbonate species in aqueous solution was investigated by comparing its structure parameters with those of the complex preserved in a crystal structure. The solution species prevails in aqueous solution of 0.05 M U(IV) and 1 M NaHCO3 at pH 8.3. Single crystals of Na-6[U(CO3)(5)]center dot 12H(2)O were obtained directly from this mother solution. The U(IV) carbonate complex in the crystal structure was identified as a monomeric [U(CO3)(5)](6-) anionic complex. The interatomic distances around the U(IV) coordination polyhedron show average distances of U-O = 2.461(8) angstrom, U-C = 2.912(4) angstrom and U-O-dist = 4.164(6) angstrom. U L-3-edge EXAFS spectra were collected from the solid Na-6[U(CO3)(5)]center dot 12H(2)O and the corresponding solution. The first shell of the Fourier transforms (FTs) revealed, in both samples, a coordination of ten oxygen atoms at an average U-O distance of 2.45 +/- 0.02 angstrom, the second shell originates from five carbon atoms with a U-C distance of 2.91 +/- 0.02 angstrom, and the third shell was fit with single and multiple scattering paths of the distal oxygen at 4.17 +/- 0.02 angstrom. These data indicate the identity of the [U(CO3)(5)](6-) complex in solid and solution state. The high negative charge of the [U(CO3)(5)](6-) anion is compensated by Na+ cations. In solid state the Na+ cations form a bridging network between the [U(CO3)(5)](6-) units, while in liquid state the Na+ cations seem to be located close to the anionic complex. The average metal-oxygen distances of the coordination polyhedron show a linear correlation to the radius contraction of the neighbouring actinide(IV) ions and indicate the equivalence of the [An(CO3)(5)](6-) coordination within the series of thorium, uranium, neptunium and plutonium.
机译：通过比较其结构参数与保留在晶体结构中的配合物的结构参数，研究了水溶液中的有限的U（IV）碳酸盐种类。溶液种类主要存在于pH 8.3的0.05 M U（IV）和1 M NaHCO3水溶液中。 Na-6 [U（CO3）（5）]中心点12H（2）O的单晶直接从该母液中获得。晶体结构中的碳酸U（IV）络合物被鉴定为单体[U（CO3）（5）]（6-）阴离子络合物。 U（IV）配位多面体周围的原子间距离显示U-O = 2.461（8）埃，U-C = 2.912（4）埃和U-O-dist = 4.164（6）埃的平均距离。从固体Na-6 [U（CO3）（5）]中心点12H（2）O和相应的溶液中收集U L-3-edge EXAFS光谱。在两个样本中，傅立叶变换（FTs）的第一个壳都显示了十个氧原子的配位，平均UO距离为2.45 +/- 0.02埃，第二个壳源自五个碳原子，UC距离为2.91 + 0.02埃，并且第三壳以4.17 +/- 0.02埃的远侧氧的单个和多个散射路径拟合。这些数据表明固态和溶液状态下的[U（CO3）（5）]（6-）配合物的身份。 [U（CO3）（5）]（6-）阴离子的高负电荷被Na +阳离子补偿。在固态下，Na +阳离子在[U（CO3）（5）]（6-）单元之间形成桥接网络，而在液态下，Na +阳离子似乎位于靠近阴离子络合物的位置。配位多面体的平均金属-氧气距离与相邻act系离子（IV）的半径收缩呈线性关系，并指示[An（CO3）（5）]（6-）配位在一系列or，铀，n和p。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号