| 查看: 255 | 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
294求调剂
已经有6人回复
-
322求调剂：一志愿湖南大学 材料与化工（085600），已过六级。
已经有14人回复
-
282求调剂
已经有6人回复
-
调剂
已经有9人回复
-
315求调剂
已经有13人回复
-
材料调剂
已经有8人回复
-
070300化学学硕311分求调剂
已经有6人回复
-
求调剂
已经有7人回复
-
材料调剂
已经有9人回复
-
一志愿211，化学学硕，310分，本科重点双非，求调剂
已经有9人回复
