Thermodynamic Stabilities of Ni(II), Cu(II), Co(II), Fe(III), AND U(II) Complexes of the Oximated Derivative of P-Tert-Butylcalix[6]Arene

Autor:	Salih Yildiz, Ufuk Sancar Vural
Rok vydání:	1995
Předmět:	Exothermic reaction Polymers and Plastics Chemistry Stability constants of complexes Stereochemistry Ionic strength Materials Chemistry Ceramics and Composites Physical chemistry Ionic bonding Chemical stability General Chemistry
Zdroj:	Journal of Macromolecular Science, Part A. 32:1123-1132
ISSN:	1520-5738 1060-1325
DOI:	10.1080/10601329508019153
Popis:	The stability constant (log K) of Ni(II), Cu(II), Co(II), Fe(III) and U(II) complexes with the oximated derivative of p-tert-butylcalix[6]arene were determined at different ionic strengths (0.012, 0.023 and 0.032 M) and at different temperatures (20°,24°,28° and 32°C). For each metal-ligand system at each temperature, thermodynamic stability constant, log K°, was obtained graphically at zero ionic strength from the plot of log K vs ionic strength. The order of thermodynamic stability of the complexes is as follows: U(II)>Fe(III)>Ni(II)>Cu(II)>Co(II). The stability constants were found to be proportional with the ionic strength and inversely proportional to temperature. Thermodynamic parameters such as ΔH°, ΔS° were derived from the plot of log K° vs T−1 and ΔG was calculated for each temperature. Based on the negative values of ΔG and ΔH° suggest that the metal-ligand interaction is exothermic.
Databáze:	OpenAIRE
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