Thermodynamics for complex formation between palladium(II) and oxalate

PILNÝ, Radomír, Přemysl LUBAL and Lars Ivar ELDING. Thermodynamics for complex formation between palladium(II) and oxalate. Dalton Transactions. Royal Society of Chemistry, 2014, vol. 43, No 32, p. 12243-12250. ISSN 1477-9226. Available from: https://dx.doi.org/10.1039/c4dt01062k.

Basic information

• Original name: Thermodynamics for complex formation between palladium(II) and oxalate
• Authors: PILNÝ, Radomír (203 Czech Republic, belonging to the institution), Přemysl LUBAL (203 Czech Republic, guarantor, belonging to the institution) and Lars Ivar ELDING (752 Sweden).
• Edition: Dalton Transactions, Royal Society of Chemistry, 2014, 1477-9226.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10402 Inorganic and nuclear chemistry
• Country of publisher: United Kingdom of Great Britain and Northern Ireland
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 4.197
• RIV identification code: RIV/00216224:14310/14:00078301
• Organization unit: Faculty of Science
• Doi: http://dx.doi.org/10.1039/c4dt01062k
• UT WoS: 000339862000016
• Keywords in English: palladium(II) ion; oxalate; metal complex formation; thermodynamics
• Tags: AKR, rivok
• Tags: International impact, Reviewed

Abstract

Complex formation between [Pd(H2O)4]2+ and oxalate (ox = C2O42-) has been studied spectrophoto-metrically in aqueous solution at variable temperature, ionic strength and pH. Thermodynamic parameters at 298.2 K and 1.00 M HClO4 ionic medium for the reaction [Pd(H2O)4]2+ + H2ox <-> [Pd(H2O)2(ox)] + H3O+ with equilibrium constant K1,H (in mol.dm-3) are log10K1,H = 3.38 ± 0.08, delta H0 = -33 +/- 3 kJ.mol-1, and deltaS0 = -48 +/- 11 J.K-1.mol-1, as determined from spectrophotometric equilibrium titrations at 15.0, 20.0, 25.0 and 31.0 degrees of Celsius. Thermodynamic overall stability constants Beta_n_0 (in (mol.dm-3)n) for [Pd(H2O)2(ox)] and [Pd(ox)2]2- at zero ionic strength and 298.2 K, defined as the equilibrium constants for the reaction Pd2+ + n ox2- <-> [Pd(ox)n]2-2n (water molecules omitted) are log10Beta_1 = 9.04 ± 0.06 and log10Beta_ = 13.1 +/- 0.3, respectively, calculated by use of Specific Ion Interaction Theory from spectrophotometric titrations with initial hydrogen ion concentrations of 1.00, 0.100 and 0.0100 mol.dm-3 and ionic strengths of 1.00, 2.00 or 3.00 mol.dm-3. The palladium complexes are significantly more stable than oxalato complexes of other divalent metals with higher co-ordination numbers as a result of the chelate effect.

Links

• ED1.1.00/02.0068, research and development project: Name: CEITEC - central european institute of technology