Binding of acrylic and sulphonic polyanions by open-chain polyammonium cations |
| |
Authors: | Crea F De Robertis A De Stefano C Sammartano S Gianguzza A Piazzese D |
| |
Institution: | a Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone, 31 I-98166 S. Agata di Messina, Italy b Dipartimento di Chimica Inorganica, Università di Palermo, Viale delle Scienze, Parco d'Orleans II, I-90128 Palermo, Italy |
| |
Abstract: | The interactions between some acrylic and sulphonic polyanions and some protonated amines (diamines NH2-(CH2)x-NH2, x=2,…,10; linear tri-, tetra-, penta- and hexa-amines) were studied potentiometrically in aqueous solution, at 25°C. For both types of polyanions AL2Hi (L?, monomer of polyanion, A, amine) species are formed, with i=1,…,n (n=number of amino groups in the amine). The stability of these species is strictly dependent on the polyammonium cation charge, and fairly independent of the type of amine (in diamine species maximum stability is observed for x=4, 5). Acrylic and sulphonic polyanion complexes are considerably stronger than analogous species formed by low molecular weight anions. Mean stability can be expressed as log K=2.87ζ2/3, for polyacrylic anions and log K=2.42ζ2/3 for polysulphonic anions (ζ=absolute value for charge product of reactants). |
| |
Keywords: | Anion coordination chemistry Polyacrylic acid Polysulphonic acids Linear polyammonium cations Polyammonium–polyanion complexes Speciation Aquatic chemistry |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|