Studies on Complexation of Alkaline Earth Metal Cations with Acyclic Polyether Dicarboxylic Acids
作者:Jong Seung Kim、Sang Chul Lee、Eun Tae Kim、Jae Hoon Cho、Moon Hwan Cho、Joung Hae Lee
DOI:10.1021/je980058h
日期:1998.11.1
Acyclic polyether dicarboxylicacids having butyl and tetradecyl side alkyl chains at the α-position of the carboxylic acid sidearm unit were prepared by the reaction of bisphenol and 2-bromoalkanoic acid in the presence of sodium hydride with quantitative yields. Complexation studies and solvent extraction on complexes of these ethers with alkalineearthmetal ions indicate that 1,2-bis((2-2‘-car
Separation of yttrium-90 from strontium-90 by solvent extraction with ionizable crown ethers
作者:Donald J. Wood、S. Elshani、H. S. Du、N. R. Natale、C. M. Wai
DOI:10.1021/ac00058a009
日期:1993.5.15
sym-Dibenzo-16-crown-5-oxyacetic acid and its analogues are selective for the extraction of Y3+ over Sr2+ from aqueous solutions into chloroform. The selectivity and the pH range of extraction are influenced by the structure of the ligand. The size of the macrocyclic cavity, the tether length of the lariat, the attachment of alkyl functional groups to the lariat, and the identity of the ionizable group can affect selectivity and extraction efficiency. When the carboxylic acid at the terminal end of the lariat is replaced by a hydroxamic acid, the selectivity for Y3+ over Sr2+ is significantly increased. Using these ionizable crown ethers as extractants, Y-90 fractions of greater than 99.9% purity can be obtained in a single solvent extraction step from solutions of Sr-90.
Wood Donald J., Elshani S., Du H. S., Natale N. R., Wai C. M., Anal. Chem., 65 (1993) N 10, S 1350-1354
作者:Wood Donald J., Elshani S., Du H. S., Natale N. R., Wai C. M.
DOI:——
日期:——
Synthesis of new lipophilic acyclic di-ionizable polyethers, bis(crown ethers) and macrocyclic diamides
作者:Sadik Elshani、Chien M. Wai、N.R. Natale、Richard A. Bartsch
DOI:10.1016/s0040-4020(99)00514-1
日期:1999.7
A series of new lipophilic acyclic polyethers containing two carboxylic or hydroxamic acid groups have been prepared. From lipophilic acyclic polyether dicarboxylic acids 2, 9 and 13, the bis(crownethers) 20–25 were synthesized. From lipophilic acyclic polyether dicarboxylic acids 10–12 and 14, the new macrocyclic diamides 26–32 were prepared in high yields without the use of high dilution techniques