Abstract
The effect of various components, including α,α′-dipyridyl (α,α′-dip), phenanthroline (Phen) and bathophenanthroline (B-phen), on the complexation of Ni(II) with 1,3-diphenyl–2-(2-hydroxy-4- nitrophenylhydrozo)propodion-1,3 (R) was studied. Homogeneous (Ni(II)-R) and mixed-ligand (Ni(II)-R-α,α'- dip, Ni(II)-R-Phen and Ni(II)-R-B-phen) complex compounds are determined to form at pH = 6, 5.5 and 5, respectively. The yield of the Ni(II)-R complex is established to be maximal at R concentration of 8·10 -5 M; Ni(II)-R-α,α'-dip – at concentration R and α,α'-dip of 8·10 -5 and 5.2·10 -5 M, respectively; Ni(II)-R-Phen – at concentration R and Phen of 8·10 -5 and 4.8·10 -5 M, respectively; Ni(II)-R-B-phen – at concentration of R and B-phen 8·10 -5 and 4·10 -5 M, respectively. All complexes, which differ in stability, were determined to form immediately after mixing the solutions of the components. The ratio of reacting components in the composition of homogeneous (1:2) and mixed (1:2:1) ligand compounds is established in terms of conformity to Beer's law. The equation coefficients for the calibration curve were obtained by the method of least squares. In the complexation of nickel(II), the А = f(c) dependence was shown to be expressed by linear equations. The stability constants of homogeneous (Ni(II)-R) and mixed-ligand (Ni(II)-R-α,α'-dip, Ni(II)-R-Phen and Ni(II)-R-B-phen) complexes were calculated. Under optimal complexation conditions, Ni(II)-R was titrated with a solution of the components, including α,α'-dip, Phen and B-phen, using the conductometric method. The effect of foreign ions on the complexation of nickel(II) with R both in the absence and presence of other components was studied. In the presence of other components, the selectivity of complexation reactions was established to increase significantly. These reagents were proved to be more selective for spectrophotometric determination of nickel(II) in comparison with reagents known from the literature. The developed technique was applied for nickel(II) determination in three varieties of apples.
Highlights
ВВЕДЕНИЕ По сравнению с другими переходными металлами никель является умеренно токсичным элементом, однако, даже при низкой концентрации оказывает общее токсическое воздействие на организм человека, повышение его содержания вызывает заболевания дыхательных путей и легких, злокачественные опухоли и дерматические реакции
Homogeneous (Ni(II)-R) and mixed-ligand (Ni(II)-R-α,α'dip, Ni(II)-R-Phen and Ni(II)-R-B-phen) complex compounds are determined to form at pH = 6, 5.5 and 5, respectively
The yield of the Ni(II)-R complex is established to be maximal at R concentration of 8·10-5 M; Ni(II)-R-α,α'-dip – at concentration R and α,α'-dip of 8·10-5 and 5.2·10-5 M, respectively; Ni(II)-R-Phen – at concentration R and Phen of 8·10-5 and 4.8·10-5 M, respectively; Ni(II)-R-B-phen – at concentration of R and B-phen 8·10-5 and 4·10-5 M, respectively
Summary
В работе использовали 1·10-3 М этанольный раствор реагента и водно-этанольные растворы (3:7) третьих компонентов, которые готовили растворением их точных навесок. Окраска реагента и комплексов зависит от рН среды, поэтому спектры поглощения при комплексообразовании изучали на фоне контрольного опыта R-α,α'-дип, R-Фен и R-Б-фен. Под влиянием третьих компонентов у всех образующихся смешанолигандных комплексов наблюдался батохромный эффект Изучение зависимости оптической плотности от рН раствора показало, что при взаимодействии с α,α'-дипиридилом, диантипирилметаном и батофенантролином оптимальные условия комплексообразования сдвигаются в кислую среду (рН = 5) для всех комплексов 1. Спектры поглощения растворов комплексов с никелем(II): 1 – Ni-R; 2 – Ni-R-α,α'-дип; 3 – Ni-R-Фен; 4 – Ni-R-Б-фен. 2. Зависимость оптической плотности раствора комплексов никеля(II) от pH в присутствии и в отсутствие третьих компонентов при опт. При оптимальных условиях комплексообразования Ni(II)-R титровали раствором третьих компонентов (α,α'-дип, Фен, и Б-фен) кондуктометрическим методом [20] При оптимальных условиях комплексообразования Ni(II)-R титровали раствором третьих компонентов (α,α'-дип, Фен, и Б-фен) кондуктометрическим методом [20] (табл. 2)
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