| 查看: 263 | 回复: 0 | ||
[求助]
Selective Binding to Alkali/Heavy Metal Ions of Bis(benzoaza-15-crown-5)
|
|
The structure of compound 1 was determined on a Bruker SMART 1000 CCD detector/PLATFORM diffractometer using monochromatic Mo Kα radiation (=0.71073 Å ) in the range from 2.41°to 25.01° at 293 K. The final cycle of full-matrix least-squares refinement was based on 1727 observed reflections. Calculations were completed with SHELXTL (Simens, version 5.04) program. In the molecular structure of compounds 1, the two benzene rings lie in the same plane, two crown ether ring are also in the same plane. The dihedral angle between crown ether cycle flat and chain is similar to 90 degree. From crystal structure, forming sandwich complexes between 1 and metal ions is difficult because of the rigid in bridge chain. This is consistent with the later experimental results. In the experimental of solvent extraction, metal ions were extracted to organic layer from aqueous phase. Table 3 shows distribution ratios (DM) of various metal ions between the two phases. The relative selectivity of cations can figure up from following formula: DM = [M+]org / [M+]aq = %Ex / (100 %Ex). |
回复此楼» 猜你喜欢
面上项目没有好文章就没希望了吗？
已经有15人回复
-
困死了
已经有8人回复
-
不知道还有没有招博士的学校了
已经有5人回复
-
售SCI一区T0P文章，我:8.O.5.5.1.O.5.4,科目齐全,可+急
已经有8人回复
-
材料博士申请
已经有5人回复
-
售SCI一区T0P文章，我:8.O.5.5.1.O.5.4,科目齐全,可+急
已经有7人回复
-
售SCI一区T0P文章，我:8.O.5.5.1.O.5.4,科目齐全,可+急
已经有9人回复
-
还有课题组有博士名额吗
已经有6人回复
-
关于水星近日点进动成因的质疑 与实证分析
已经有10人回复
-
博士申请
已经有3人回复
