ISSN:
1040-0397
Keywords:
Ion selective electrodes
;
Carbonate
;
Trifluoroacetophenone
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Potentiometric properties of carbonate-selective membranes based on some trifluroacetophenone derivatives [e.g., trifluoroacetyl-p-decylbenzene (TFADB), 1,7-bis(4′-trifluoro-acetophenyl)-4-decyl-1,7-dioxo-2,6-dioxy-heptane (compound I) and 1,2-bis(4-trifluoroacetylbenzoyloxymethyl)-benzene (compound II)] with varying concentration of tridedecylmethyl ammonium chloride (TDMACl) have been examined. It was observed that both TFADB- and compound-II-based membranes with about 50 mol % TDMACl (relative to the carrier) exhibit the maximum selectivity for carbonate. On the other hand, the compound-I-based membranes with about 50 mol % TDMACl showed the greatest discrimination of lipophilic anions (ClO4-, salicylate, SCN3-) including NO3-, but those with about 80 mol % against Cl- and CH3COO-. These results conform well to the theoretical model developed by Simon et al. if we assume trifluroacetophenone derivatives form 2:1 and/or 3:1 complexes with the anions in the plasticized PVC-based membranes. Molecular mechanics calculations indicated that bis-trifluroacetophenones may not form 1:1 complex with the carbonate ion because of a large steric hindrance between the two bulky adjacent chains.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140091112
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