engleski

Application of 1-(4-Tolyl)-2-methyl-3-hydroxy-4-pyridone to the Spectrophotometric Determination of Vanadium(V)

The application of 1-(4-tolyl)-2-methyl-3-hydroxy-4-pyridone(HY) for the spectrophotometric determination of V(V) by extraction into chloroform was investigated. It was found that depending on the extraction conditions three types of complexes are formed. At pH 1.2-2.5 an orange complex of the composition VO2Y(HY) with a maximum absorption at 500 nm is formed. However, at 1.2-2.0 M hydrogen ion concentration and in the presence of an excess of chloride ions a blue complex VO2Cl(HY)2 with maximum absorption at 625 nm was found. In the presence of an excess of perchlorate ions and at 0.2-1.0 M hydrogen ion concentration a blue complex VO2ClO4(HY)2 with maximum absorption at 605 was found. Solutions of these complexes show great stability and they follow the Lambert-Beers law. Procedures for the determination of vanadium at either 500 or 625 nm are very simple fast and selective. The compositions of the complexes have been characterized in chloroform solution. They were also isolated in crystalline form and identified by elemental analysis and infrared spectroscopy.

vanadium/ extraction / spectrophotometric determination /

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