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Formation and stability of proton-amine-inorganic anion complexes in aqueous solution

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Abstract

Interaction of some amines with inorganic ligands was studied potentiometrically in aqueous solutions at 25°C at different ionic strengths. The systems taken into account were: meta-PP, meta-TPP, en-PP, en-TPP, en-HPO 2−4 , dap-SO 2−4 , tetren-HPO 2−4 , 6da-PP and 8da-TPP (meta=methylamine, en=ethylenediamine, tetren=tetraethylenepentamine, dap=1,2-diaminopropane, 6da=1,6-hexanediamine, 8da=1,8-octanediamine, PP=pyrophosphate, TPP=tripolyphosphate). Several ALHr species are formed for all the studied mixed systems (A=amine, L =inorganic ligand), and in some cases ApLqHr species were also found. The stability of mixed proton-ligand-ligand species is proportional to the charges involved in the complexation reaction and, to some extent, it depends on steric characteristic of the ligands. A simple relationship has been found between formation constants of mixed ligand species and charges involved in the complexation reaction. The ionic strength dependence of formation constants has been taken into account, and it was found that, also for these types of mixed complexes, a general equation independent of the nature of the reactants can be used.

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Authors and Affiliations

  1. Dpt. Chimica Analitica, Università, via P. Giuria 5, I-10125, Torino, Italy

    Enrico Prenesti

  2. Dpt. Chimica Inorganica, Analitica e Struttura Molecolare, Università, Salita Sperone 31, I-98166, S. Agata di Messina, Messina, Italy

    Pier G. Daniele, Concetta De Stefano & Silvio Sammartano

Authors
  1. Pier G. Daniele
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  2. Enrico Prenesti
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  3. Concetta De Stefano
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  4. Silvio Sammartano
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Daniele, P.G., Prenesti, E., De Stefano, C. et al. Formation and stability of proton-amine-inorganic anion complexes in aqueous solution. J Solution Chem 24, 325–341 (1995). https://doi.org/10.1007/BF01150872

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