Expressions for Enthalpies of Concurrent Polynuclear Complex Formation Reactions in Two-Phase Aqueous Systems
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POVAR, Igor; SPINU, Oxana; PINTILIE, Boris. Expressions for Enthalpies of Concurrent Polynuclear Complex Formation Reactions in Two-Phase Aqueous Systems. In: Journal of Solution Chemistry. 2018, nr. 11(47), pp. 1725-1739. ISSN 0095-9782.
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Journal of Solution Chemistry
Numărul 11(47) / 2018 / ISSN 0095-9782

Expressions for Enthalpies of Concurrent Polynuclear Complex Formation Reactions in Two-Phase Aqueous Systems


DOI: 10.1007/s10953-018-0802-4
Pag. 1725-1739

Povar Igor, Spinu Oxana, Pintilie Boris
 
Institute of Chemistry of the Academy of Sciences of Moldova
 
Disponibil în IBN: 3 decembrie 2018


Rezumat

The paper presents a new thermodynamic approach to studying polynuclear complex formation reactions in multicomponent two-phase systems, solid phase plus saturated aqueous solution, under real conditions. The quintessence of this developed approach consists in the thermodynamic analysis of concurrent reactions on the basis of the introduced notion of a generalized reaction equation. The formation of complex polynuclear species is characterized by certain peculiarities in the behavior of studied two-phase heterogeneous systems. The formation of polynuclear complexes of the metal ion with a complexing agent leads to expressions for the enthalpy ∆H and heat capacity ∆Cp as certain concentration functions, which are normative multipliers, referring these thermochemical quantities to one mole of the metal ion. It is shown that one of these functions, Φ, characterizes the degree of formation of polynuclear complexes. In the case of concurrent formation of mono- and polynuclear complexes, the derived expressions are useful in distinguishing separate contributions of individual complex formation reactions to the ∆H and ∆Cp of the overall process.

Cuvinte-cheie
Enthalpy of complex formation reaction, Generalized reaction equation, heat capacity, heterogeneous system, Polynuclear complex