Thermodynamic functions of Ni(II) complexes with 5-(2-hydroxyphenyl)-pyrazole derivatives. A potentiometric study

Autor:	M. L. Narwade, S. D. Deosarkar, V. J. Thakre
Rok vydání:	2013
Předmět:	Potentiometric titration Enthalpy Complex formation Pyrazole Gibbs free energy Dissociation constant Metal chemistry.chemical_compound symbols.namesake chemistry visual_art visual_art.visual_art_medium Electroanalytical method symbols Physical chemistry Physical and Theoretical Chemistry
Zdroj:	Russian Journal of Physical Chemistry A. 87:1767-1770
ISSN:	1531-863X 0036-0244
DOI:	10.1134/s0036024413100208
Popis:	Proton-ligand dissociation constants of five biologically important pyrazole derivatives, viz. [5-(2-hydroxyphenyl)-3-(pyridin-3-yl)-4-benzoyl]-pyrazol (HPPBP), [5-(2-hydroxyphenyl)-3-(3-nitrophenyl)-4-(3-pyridinoyl)]-pyrazol (HPNPPP), [5-(2-hydroxyphenyl)-3-(3-nitrophenyl)-4-benzoyl]-pyrazol (HPNPBP), [5-(2-hydroxyphenyl)-3-phenyl-4-(3-pyridinoyl)]-pyrazol (HPPPP), and [5-(2-hydroxyphenyl)-3-(3-nitrophenyl)-4-(2-furoyl) pyrazol (HPNPFP) and metal ligand stability constants of their Ni(II) complexes in 70% (v/v) dioxane-water and 0.1 M KNO3 were determined at 298.15, 303.15, and 308.15 K by potentiometric method. Thermodynamic functions, such as, free energy change (ΔG ○), enthalpy change (ΔH ○) and entropy (ΔS ○) change for dissociation and complex formation have been estimated form temperature dependence of proton-ligand and metal-ligand stability constants and interpreted in terms of feasibility of these processes.
Databáze:	OpenAIRE
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