Thermodynamics of mixed-ligand complex formation of copper (II) ethylenediaminetetraacetate with hexamethylenediamine in an aqueous solution

• Published in: Journal of thermal analysis and calorimetry Vol. 100; no. 1; pp. 355 - 360
• Main Authors: Pyreu, D. F., Kozlovskii, E. V.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-04-2010; Springer
• Subjects: ACETATES; Analytical Chemistry; Aqueous solutions; CALORIMETRY; Chemistry; Chemistry and Materials Science; Complex formation; Copper; Copper compounds; ETHYLENE; ETHYLENEDIAMINE; Ethylenediamines; Inorganic Chemistry; LIGANDS; Measurement Science and Instrumentation; Physical Chemistry; Polymer Sciences; SOLUTIONS; Strength; THERMAL ANALYSIS; THERMODYNAMIC PROPERTIES; Thermodynamics; Thermodynamic parameters; Copper (II) ethylenediaminetetraacetate; Hexamethylenediamine; Mixed-ligand complex; Denticity
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-009-0144-y

The mixed-ligand complex formation in the system Cu
2+
−Edta
4−
−(CH
2
)
6
(NH
2
)
2
(L), where L is hexamethylenediamine has been calorimetrically, pH-potentiometrically and spectrophotometrically studied in aqueous solution at 298.15 K and the ionic strength of I = 0.5 (KNO
3
). The thermodynamic parameters of formation of the CuEdtaL
2−
, CuEdtaHL
−
(CuEdta)
2
L
4−
and (CuEdta)
2
En
4−
complexes have been determined. The most probable coordination mode for the complexone and the ancillary ligand in the mixed-ligand complexes was discussed.