Equilibrium study on Pd(II) chelates of mercapto carboxylic acids

Citation
G. Crisponi et al., Equilibrium study on Pd(II) chelates of mercapto carboxylic acids, POLYHEDRON, 18(25), 1999, pp. 3257-3262
Citations number
29
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
POLYHEDRON
ISSN journal
02775387 → ACNP
Volume
18
Issue
25
Year of publication
1999
Pages
3257 - 3262
Database
ISI
SICI code
0277-5387(1999)18:25<3257:ESOPCO>2.0.ZU;2-I
Abstract
The coordination of Pd(II) with a set of different mercapto and dimercapto compounds has been investigated by potentiometric titration at 25 degrees C in KCl 0.1 M. The ligand concentration ranged from 10(-4) M to 10(-3) M, a nd for each ligand concentration the 0.25, 0.50, 0.75 and 1.00 Metal/Ligand ratios were examined in the 2.5-11 pH range. Using KCl 0.1 M as an ionic s trength medium the reported formation constants are implicitly referred to the complexation reaction starting from [PdCl4](2-) as is generally done fo r the aquo ion. On the bases of the estimated complexation stoichiometries some coordination models are proposed. The influence of -SH basicity, total charge of complexes and steric factors on the coordination properties of t he various ligands is discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.