Publication: Temperature and methyl substitution effect on copper(ii) complexes with biorelevant ligands and species distribution in aqueous solution
No Thumbnail Available
Date
2019-06-24
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis Ltd
Abstract
In the present work, the stability constants of copper(II) complexes with 1,10-phenanthroline (phen), its methyl derivatives [4-methyl-1,10-phenanthroline (4-mphen) and 4,7-dimethyl-1,10-phenanthroline (dmphen)] and L-tryptophan (trp) were investigated using potentiometric method in 0.1 mol.L-1 KCl aqueous ionic media at 298.15 K, 308.15 K and 318.15 K. 'BEST' software package was applied to the potentiometric data for the calculation of the protonation constants of the ligands and the stability constants of the copper(II) binary and ternary complexes. The concentration distributions of the various complex species formed in solution were also evaluated as a function of pH using the 'SPE' software package. The thermodynamic parameters, enthalpy change (Delta H degrees), entropy change (Delta S degrees) and Gibbs energy change (Delta G degrees) were determined from the stability constants using Gibbs and van't Hoff equations. The complexation of copper(II) with the ligands in this work is spontaneous, exothermic and favourable at lower temperatures.
Description
Keywords
Alpha-amino-acids, Crystal-structure, Formation equilibria, Chemical speciation, Ternary complexes, Dna-binding, Stability, Cu(ii), Ni(ii), Copper(ii), 1, 10-phenanthroline derivatives, L-tryptophan, Stability constants, Potentiometric methods, Thermodynamic parameters, Science & technology, Physical sciences, Chemistry, physical, Physics, condensed matter, Chemistry, Physics
Citation
Collections
Metrikler