Thermodynamic parameters, Delta G degrees, Delta H degrees and T Delta S degrees are reported for the formation of proton amine-hexacyanoferrate(II) complexes, in aqueous solution, at 25 degrees C. Delta H degrees were determined by the temperature dependence of formation constants and/or by direct calorimetry in aqueous solution, at T = 25 degrees C. Enthalpy changes for the reaction H(j)A(i+) + HjFe(CN)(6)(j-4) = AFe(CN)(6)H-i+j(i+j-4) (where A = methylamine, ethylenediamine, and tetraethylenepentamine) are quite low and the main contribution to the stability of these complexes arises from the entropic term, as expected for electrostatic interactions. When j = 0, the formation entropy is linearly dependent on i according to the simple equation T Delta S degrees = 13.4 i kJ-mol(-1).

Thermodynamics of protonated amine-hexacyanoferrate(II) complex formation in aqueous solution

DE STEFANO, Concetta;FOTI, Claudia;GIUFFRE', Ottavia;
1998-01-01

Abstract

Thermodynamic parameters, Delta G degrees, Delta H degrees and T Delta S degrees are reported for the formation of proton amine-hexacyanoferrate(II) complexes, in aqueous solution, at 25 degrees C. Delta H degrees were determined by the temperature dependence of formation constants and/or by direct calorimetry in aqueous solution, at T = 25 degrees C. Enthalpy changes for the reaction H(j)A(i+) + HjFe(CN)(6)(j-4) = AFe(CN)(6)H-i+j(i+j-4) (where A = methylamine, ethylenediamine, and tetraethylenepentamine) are quite low and the main contribution to the stability of these complexes arises from the entropic term, as expected for electrostatic interactions. When j = 0, the formation entropy is linearly dependent on i according to the simple equation T Delta S degrees = 13.4 i kJ-mol(-1).
1998
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/1892147
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 4
social impact