Abstract
The syntheses of several bis-(1,2-phenylenedioxydiscetamides) with eight binding sites (four ethers, four amides) are described. It had been anticipated that these bis-compounds would be much stronger binders for Group IIA cations than are members of our previously described 1,2-phenylenedioxydiacetamide system, e.g. 1-3, which give isolable complexes usually of 2:1 ligand/metal cation stoichiometry. Binding constants for the new diesters 4 and 5 were determined in methanol using UV absorption changes and the Scatchard method. The binding strength of 4 was concentration dependent and only moderately greater than that for 1 or for the more closely related 4-hydroxymethyl compound 3. Diester 5 was a weaker binder for Group IIA cations than was either 1 or 3. Cooperativity of the two sets of binding sites with either Sr 2+ or Ba 2+ was demonstrated for 4 but not for 5. Electrochemical selectivity values (K pot ij) as determined by Simon et al for 4, 5, and 6, in liquid membrane electrodes are reported for various cations. High ion selectivity for Na + vs either Ca 2+ or K + were found, especially for 6.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
