Binding of fluoride and carbonate by open chain polyammonium cations |
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Authors: | De Stefano Concetta Foti Claudia Pettignano Alberto Sammartano Silvio |
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Institution: | Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone 31, Vill. S. Agata, 98166 Messina, Italy |
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Abstract: | The formation of open chain polyammonium cation-fluoride and -carbonate complexes was studied by potentiometric and calorimetric techniques at t=25 °C. Several species of HiAL (A=amine; L=F−, CO32−) are formed in both systems with a mean stability (ζ=|zanion×zcation|) and for fluoride and carbonate, respectively. The comparison with analogous systems (chloride and acetate for fluoride and hydrogenphosphate, sulfate and malonate for carbonate) showed that fluoride and carbonate form the most stable species with open chain polyammonium cations, among low molecular weight anions. The N-alkyl substitution does not play negligible role in the stability of these complexes, the species formed by substituted amines being more stable. |
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Keywords: | Open chain polyammonium cations Fluoride Carbonate Anion coordination chemistry Potentiometry Calorimetry Complex formation Thermodynamic parameters |
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