title: The study of polyoxometalates formation using capillary zone electrophoresis.
abstract: The formation process of polyoxometalates [PMo12 O40 ](3-) and [PMo12 - x Vx O40 ](-3-x) has been studied in aqueous solutions of 0.1 M malonate buffer at pH 2.8-3.0 using CZE. Two different approaches, pre-capillary and in-capillary, were examined and compared. In precapillary mode, the reaction mixture of the reactants and reaction products was injected into the capillary followed by the separation procedure. In in-capillary mode, the sequential input of the reagents and running electrolyte into the capillary and the species separation occurs simultaneously. The optimal parameters of in-capillary separation were established as functions of applied voltage and the length of the intermediate buffer zone between the reagents in the capillary. As a result the best-compromise conditions for the separation of the mixtures containing the reactants, intermediates, and reaction products, in order to achieve the best efficiency, symmetry, and peak areas, were achieved at -18 kV and the input parameter of 900 mbar·s. It was also shown that in-capillary mode is more informative than pre-capillary mode for studying the complex compound formation process.
authors: Research Institute, Institute of Inorganic Chemistry, Novosibirsk, Russian Federation.
authors: Artem A
authors: AA
authors: Zdanov
authors: Olga V
authors: OV
authors: Shuvaeva
mesh_terms: D019075:Electrophoresis, Capillary / Q000379:methods*; D007477:Ions / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D028561:Transition Elements / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D000099294:Polyoxometalates
chemical_list: D007477:Ions; D010100:Oxygen; D028561:Transition Elements; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates
keywords: CZE separation; Chemical reaction in-capillary; Polyoxometalates