Spectrophotometric study of uranyl-oxalate complexation in solution

HAVEL, Josef, Julio Arturo SOTO-GUERRERO and Přemysl LUBAL. Spectrophotometric study of uranyl-oxalate complexation in solution. POLYHEDRON. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD, 2002, vol. 21, 14-15, p. 1411-1420. ISSN 0277-5387.

Basic information

• Original name: Spectrophotometric study of uranyl-oxalate complexation in solution
• Authors: HAVEL, Josef (203 Czech Republic, guarantor), Julio Arturo SOTO-GUERRERO (484 Mexico) and Přemysl LUBAL (203 Czech Republic).
• Edition: POLYHEDRON, OXFORD, PERGAMON-ELSEVIER SCIENCE LTD, 2002, 0277-5387.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10406 Analytical chemistry
• Country of publisher: United Kingdom of Great Britain and Northern Ireland
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 1.414
• RIV identification code: RIV/00216224:14310/02:00008618
• Organization unit: Faculty of Science
• UT WoS: 000176723200016
• Keywords in English: Spectrophotometric study; uranyl-oxalate; complexation in solution
• Tags: complexation in solution, Spectrophotometric study, uranyl-oxalate

Abstract

Uranyl-oxalate complex equilibrium in aqueous solution was studied by UV-Vis spectrophotometry. Due to high spectra correlation, derivative spectrophotometry was also applied during the search for the best chemical model. The absorption spectra of all the complexes were calculated and found in a good agreement with theoretical considerations. Overall protonation constants of oxalate, necessary for accurate calculation of uranyl-oxalate formation constants, were also determined under the same conditions and the following values were obtained log K-1 = 3.83 +/- 0.01; log K-2 = 4.92 +/- 0.01. Stability constants determined for the [(UO2),(C2O4)(q)](2p-2q) species were: log beta(11) = 6.31 +/- 0.02, 109 +/- 12 = 11.21 +/- 0.07, log beta(13) = 13.8 +/- 0.04, log beta(23) = 18.5 +/- 0.2, log beta(25) = 28.5 +/- 0.1 (I = 3.0 M NaClO4; 25 degreesC). The equilibrium constants were extrapolated to infinite dilution by applying specific ion interaction theory (SIT) and are the following: log beta(11)(0) = 7.41 +/- 0.01, log beta(12)(0) = 11.80 +/- 0.02, log beta(13)(0) = 13.96 +/- 0.07. Formation of polynuclear [(UO2)(2)(C2O4)(3)](2-) and [(Uo(2))(2)(C2O4)(5)](6-) Species was proved and confirmed independently by conductometry and vapor pressure osmometry. (C) 2002 Published by Elsevier Science Ltd.

Links

• MSM 143100011, plan (intention): Name: Struktura a vazebné poměry, vlastnosti a analýza syntetických a přírodních molekulových ansamblů

Investor: Ministry of Education, Youth and Sports of the CR, Structure and character of bonding, properties and analysis of synthetic and natural molecular ensembles