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−, CO3 2−) are formed in both systems with a mean stability logK = 1.0ζ (ζ = |zanion ×zcation|) and logK = 2.0ζ 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.

DE STEFANO C, FOTI C, PETTIGNANO A, & SAMMARTANO S (2004). Binding of fluoride and carbonate by open chain polyammonium cations. TALANTA, 64, 510-517 [10.1016/j.talanta.2004.03.017].

Binding of fluoride and carbonate by open chain polyammonium cations

PETTIGNANO, Alberto;
2004

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−, CO3 2−) are formed in both systems with a mean stability logK = 1.0ζ (ζ = |zanion ×zcation|) and logK = 2.0ζ 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.
Settore CHIM/01 - Chimica Analitica
DE STEFANO C, FOTI C, PETTIGNANO A, & SAMMARTANO S (2004). Binding of fluoride and carbonate by open chain polyammonium cations. TALANTA, 64, 510-517 [10.1016/j.talanta.2004.03.017].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/26654
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