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Control of size in losartan/copper(II) coordination complex hydrophobic precipitate.
Mater Sci Eng C Mater Biol Appl
October 2013
Departamento de Farmácia, Universidade Federal de Juiz de Fora (UFJF), Campus Governador Valadares, Av. Dr. Raimundo Monteiro de Rezende, 330, Centro, 35010-177 Governador Valadares, MG, Brazil.
Reaction of highly soluble orally active, non-peptide antihypertensive drug losartan with copper(II) leads to the spontaneous formation of a very insoluble 2:1 covalent complex, which self assembles in a hydrophobic supramolecular structure of nanometric dimensions. Thermal analysis showed that Los/Cu(II) complex presents intermediate stability in comparison with its precursors KLos and Cu(OAc)2·H2O. Isothermal titration calorimetry indicated complexation to be a stepwise process, driven by enthalpy and entropy.
View Article and Find Full Text PDFApplication of artificial neural network to simultaneous potentiometric determination of silver(I), mercury(II) and copper(II) ions by an unmodified carbon paste electrode.
Talanta
October 2004
Department of Chemistry, Razi University, Kermanshah, Iran.
The response characteristics and selectivity coefficients of an unmodified carbon paste electrode (CPEs) towards Ag(+), Cu(2+) and Hg(2+) were evaluated. The electrode was used as an indicator electrode for the simultaneous determination of the three metal ions in their mixtures via potentiometric titration with a standard thiocyanate solution. A three-layered feed-forward artificial neural network (ANN) trained by back-propagation learning algorithm was used to model the complex non-linear relationship between the concentration of silver, copper and mercury in their different mixtures and the potential of solution at different volumes of the added titrant.
View Article and Find Full Text PDFN,N'-disalicylidene-1,3-diaminopropane as a selective chelating titrant for copper(II).
Talanta
October 2002
Department of Chemistry, Faculty of Science, Ankara University, 06100 Ankara, Turkey.
This study was carried out to develop a new complexometric titration method for determination of copper. For this purpose, the standard solutions of copper(II) (10(-3)-10(-5) M) were potentiometrically titrated using N,N'-disalicylidene-1,3-diaminopropane (Schiff base) as titrant and copper(II)-selective electrode for end-point indication in both ammonium acetate and ammonia/ammonium chloride buffer media. The stoichiometry of titration reaction and interference effects of some metal ions on titration of copper were discussed.
View Article and Find Full Text PDFInvestigation of the complexation of metal-ions by strong ligands in fresh and marine water.
Environ Sci Pollut Res Int
October 2003
Dipartimento di Chimica Generale, Università di Pavia, Via Taramelli 12, I-27100 Pavia, Italy.
Scope: The detection and investigation of metal ions bound in strong complexes in natural waters is a difficult task, due to low concentration of the metal ions themselves, and also of the strong ligands, which, moreover, are often not of a well-defined composition. Here, a method is proposed for the investigation of the speciation of metal ions in natural waters.
Objective And Method: It is based on the sorption of metal ions on strongly sorbing ion exchange resins, i.
Determination of thallium(I) in solutions containing cations interfering in potentiometric ion-pair formation-based titrations.
Talanta
June 1994
Department of Analytical Chemistry, Faculty of Chemical Technology, Technical University of Pardubice, 532 10 Pardubice, The Czech Republic.
The possibility of the use of simple potentiometric coated-wire sensors in the analysis of mixtures of ions, the determination of which is based on the ion-pairing principle, was studied. Attention was especially paid on the determination of thallium(I) in the presence of alkali metal ions, mercury(II), copper(II) and silver(I). It was found that thallium(I) can selectively be titrated with sodium tetraphenylborate in diluted solutions.
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