79364-86-6Relevant academic research and scientific papers
THE PREPARATION AND PROPERTIES OF NEUTRAL DIAMIDE IONOPHORES FOR GROUP IIA METAL CATIONS-II
Borowitz, Irving J.,Readio, Josephine D.,Li, Ven-Shun
, p. 1009 - 1016 (2007/10/02)
The elaboration of a series of neutral ligands featuring vicinal ether and N,N-dialkylacetamido groups is described.Several of these ligands were previously described.The ligands are moderate binders with Kapp=1E3-1E5 in methanol of the Group IIA cations for wich they are sensitive.Binding constants by Scatchard method are reported for number of ligands mainly with Ca, Sr, Mn and Ba.The ligands in methylene chloride solution extract these cations via their picrate salts from water.The electrochemical Kijpot (selectivity) values for some of the ligands when they are incorporated into liquid membrane electrodes and tested with various cations as determined by Simon et al. (ETH Zurich) are reported.Selectivity ratios of over 100:1 for Na vs Ca were found for several piperidenyl amides of 1,2-phenylenedioxydiacetic acid.Incorporation of N-methylamino instead of ether oxygen groups into the basic structure gives a stronger cation binder which is still selective for Group IIA vs Group IA cations but with binding capacity for transition metal cations also.Limitations of the Scatchard plots for these ligands and the non-correspondance of electrochemical selectivities with the ordering of binding of cations in single liquid phase are discussed.
Neutral Diamide Ionophores - Phenylenedioxydiacetamides
Lin, Whei Oh,Altoe, Antonio Paulo
, p. 101 - 110 (2007/10/02)
The preparation of a series of neutral ligands containing ether and amide groups is described.These ligands as well as related ones bearing other diamide groups are shown to selectively chelate Group IIA cations by picrate extraction from water to methylene dichloride.This result was also confirmed by atomic absorption measurement.The changes in UV absorption of aromatic rings and amide groups in the ligands upon titration with metal salts in methanol allow the estimation of the ordering of cation binding. - Keywords: Acyclic ionophores; Neutral ionophores; Phenylenedioxydiacetamide, complexation studies
Phenylenedioxydiacetamide - End Group Effect
Lin, Whei Oh,Altoe, Antonio Paulo
, p. 871 - 874 (2007/10/02)
A series of neutral ligands featuring ether and amide groups were prepared.The complexation studies suggest a strong participation of the extra terminal amide group. - Keywords: Complexation studies; Neutral ionophoros; Neutral ligands
