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Spectrochemical Properties of Noncubic Transition Metal complexes in Solutions. XVI. Angular Overlap Treatments of cis-Bis(2,2'-bipyridyl)oxalatechromium(III) Iodide in Aqueous Solution

Kurzak K., Biernacki K.

Polish Journal of Chemistry

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2004

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Vol. 78 / nr 5

673-679

EN

The electronic absorption spectrum of cis-[Cr(ox)(bpy)2]I (bpy = 2,2_-bipyridyl; ox = oxalate ion) of aqueous (H2O) solution, has been measured at room temperature and interpreted using the angular overlap model (AOM), and assuming C2v as the effective symmetry. All the experimental transitions are derived from Gaussian analysis of the solution spectrum. The calculations of the ligand field parameters take into account all the transitions, which are required from the ligand field theory (except those energetically higher than the range of the measured spectrum). The coordination

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Spectrochemical properties of Noncubic transition Metal Complexes in Solutions. XVII. Angular Overlap Treatment of cis-Bis(2,2'-bipyridyl)malonatechromium(III) Iodide in Aqueous Solution

Kurzak K., Biernacki K.

Polish Journal of Chemistry

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2004

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Vol. 78 / nr 5

681-686

EN

Amixed ligands chromium(III) complex with bidentate ligands: 2,2_-bipyridyl (bpy) and malonic acid deprotonated (mal-, malonate ion), has been synthesized, investigated and characterized structurally and spectroscopically. Electronic spectra of this complex were recorded in an aqueous solution at room temperature. The 'poor' experimental contours were resolved into the component bands by Gaussian analysis. The spectra were interpreted using C2v symmetry. The resolved spectra have been treated using an angular overlap model (AOM). The effect of _- and _-bonding of the bidentate ligands upon the chromium(III) ion in aqueous solution was described and discussed.

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Studies of processes during ASV determination of lead in the presence of copper on a solid electrode modified with 2,2'-bipyridyl in polyaniline

Wagner K., Strojek J. W., Kozieł K.

Chemia Analityczna

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2002

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Vol. 47, No. 3

385-397

EN

Anodic stripping voltammetry (ASV) was studied for determination of lead in the presence of copper on solid electrode, modified by polyaniline and 2,2'-bipyridyl, which forms a stable complex with copper ions and improves the accuracy of lead determination. The molecules of 2,2'-bipyridyl were immoblized on the electrode surface in a polyaniline film synthesized during electrochemical oxidation. Complementary data were obtained in spectro-photometric UV-VIS measurements of lead and copper complexes in acetate buffer and by the analysis of atomic force microscopy images of the modified glassy carbon electrode.

PL

W pracy zbadano zastosowanie w anodowej woltamperometrii inwersyjnej elektrody stałej modyfikowanej polianilinąi 2,2'-bipirydylem, którego zdolność kompleksowania jonów miedzi pozwala znacznie zwiększyć dokładność oznaczaniajonów Pb(2+) w obecności Cu(2+). Cząsteczki 2,2'-bipirydylu zostały wbudowane w warstwę polianiliny podczas elektrochemi cznej syntezy polimeru w roztworze H(2)SO(4). Właściwości modyfikowanej elektrody badano przy użyciu metod elektroanalitycznych, spektroskopii UV-VIS, mikrowagi kwarcowej oraz mikroskopii AFM. Omówiono wpływ niektórych czynników (np. czasu kontaktu elektrody z roztworem oraz stężenia jonów Cu(2+) na właściwości elektrody i mechanizm zachodzących procesów elektrochemicznych.