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Ligand-Field Analysis of Low-Spin N,N'-Propylenebis(naphthyldiiminate)nickel(II) in Ethanol Solution

Kurzak K., Gonciarz A., Kuźniarska-Biernacka I.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 1

47-56

EN

Titled complex denoted as [Ni(nappn)]ź0.5H2O, where H2nappn is tetradentate Schiff base: 1,3-bis(naphthylideneimine)propane, has been characterized by elemental analysis, molar conductivity, ultraviolet (UV) and visible (Vis) spectroscopy. The known X-ray structure of this complex shows that Ni atom adopts square-planar coordination. Combined multi-technique experiments have been applied to establish the structure of complex in solution. The molar conductivity value indicates non-electrolytic properties of solution studied. The spectroscopic measurements were used to study the coordination properties of donor-atoms and their bonding abilities. All the experimental transition energies are derived from Gaussian analysis of the solution spectrum. The d-d transition energies were used to derive the angular overlap model (AOM) and crystal-field model (CFM) parameters for the studied complex inD4h symmetry. The first full ligand-field interpretation of the low-spin Schiff base nickel(II) complex in solution has been presented.

2

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

3

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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Spectrochemical Properties of Noncubic Transition Metal Complexes in Solutions. XIII. Angular Overlap Treatment of Diaquabis(salicylideneaminothiazole)cobalt(II)

Kuźniarska-Biernacka I., Kurzak K.

Polish Journal of Chemistry

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2003

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Vol. 77 / nr 1

13-19

EN

Mixed ligand cobalt(II) complex with monodentate (water) and bidentate (Schiff base: salicylidene-2-aminothiazole) ligands has been characterized by elemental analyses, molar conductivities, ultraviolet (UV) and visible (VIS) spectroscopy. The electronic spectra of solids as well as solutions exhibit pseudo-octahedral coordination geometry for the cobalt centre. The molar conductivities indicate their non-electrolytic properties in solvents studied. Combined multi-technique experiments have been used to postulate theC2h geometry for the species in solutions and to determine the coordination properties of ligators and their bonding abilities (ligand-field parameters).

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Angular Overlap Treatment of cis-Dichlorobis(1,10-phenanthroline)chromium(III) Chloride Dihydrate in Aqueous Solution

Kurzak K., Biernacki K.

Polish Journal of Chemistry

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2002

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Vol. 76 / nr 4

503-509

EN

Low-symmetry mixed-ligands cis-[CrCl2(phen)2]Cl complex (phen = 1,10-phenanthroline) has been characterized spectroscopically. Electronic spectrum of aqueous solution of this complex has been measured at room temperature and interpreted using the angular overlap model (AOM), and assuming C2v symmetry. All the experimental transition energies 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 in the ligand-field theory (except those energetically higher than the range of the measured spectrum).

6

Spectrochemical Properties of Noncubic Transition Metal Complexes in Solution : XI. Angular Overlap Studies of Bis(oxalato)- and Bis(malonato)diaquachromate(III) Complexes in Aqueous Solution

Kurzak K.

Polish Journal of Chemistry

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2000

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Vol. 74, nr 3

331-347

EN

Mixed ligands chromium(III) complexes with monodentate(water) and bidentate ligands: oxalic acid deprotonated or malonic acid have been synthesized, investigated and characterized structurally and spectroscopically. Their geometrical isomers have been studied spectrophotometrically in aqueous solution. The "poor" experimental contours were resolved into the component bands by Gaussian analysis.The effect of different bonding of the bidentate ligands upon the chromium(III) ion in aqueous solution was described and discussed.

7

Angular overlap treatment of cis-bis(2,2'-bipyridyl)dichlorochromium(III) chloride dihydrate in aqueous solution

Kurzak K., Biernacki K.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 4

660-666

EN

Six-coordinate cis-[CrCL2(bipy)2](+) complex (bipy=2,2'-bipyridyl) has been prepared. Electron spectrum of aqueous solution of this complex has been recorded and explained by the angular overlap model (AOM), assuming C-2v symmetry. All transition energies are derived from Gaussian analysis of the spectrum. The calculations of the ligand field parameters take into account all the transitions required in the ligand field (LF) theory (except those energetically higher than the range of the spectrum recorded).