Wyniki wyszukiwania - BazTech

1

Recognition of Environmentally Important Ions

Łukasik N., Wagner-Wysiecka E., Hubscher-Bruder V., Michel S., Bocheńska M.

Logistyka

|

2013

|

nr 4

EN

The synthesis and binding properties of N,N’-bis(2-naphthyl)pyridine-2,6-dicarboxyamide are described. The ion binding ability in solution has been tested by UV-Vis spectrophotometry and liquid-liquid extraction of metal picrates from water into dichloromethane. Among studies ions spectral changes of ligand solution in acetonitrile were observed in the presence of Pb2+, Cu2+, and F- ions. The stability constants (logβ) and the stoichiometry of formed complexes were determined.

PL

Artykuł przedstawia syntezę i właściwości kompleksujące receptora jonów, będącego amidową pochodną kwasu pirydyno-2,6-dikarboksylowego. Badania prowadzone były przy użyciu spektrofotometrii UV-Vis oraz metod ekstrakcyjnych.

2

The Synthesis, X-ray Structure and Metal Cation Complexation Properties of Colored Crown with Two Heterocyclic Residues as a Part of Macrocycle

Wagner-Wysiecka E., Luboch E., Fonari M. S.

Polish Journal of Chemistry

|

2008

|

Vol. 82, nr 7

1319-1330

EN

New azocrown ether with pyrrole and pyridine as parts of macrocycle was synthesized. Metal cation complexation was investigated in acetonitrile and in acetonitrile-water mixture with the use of UV/VIS spectroscopy. Structure of the macrocycle was studied by X-ray diffraction.

3

Metal Cation Complexation by Pyrrole-Containing Chromogenic Macrocycles

Wagner-Wysiecka E., Rzymowski T., Luboch E.

Polish Journal of Chemistry

|

2008

|

Vol. 82, nr 6

1299-1302

4

Optical recognition elements. Macrocyclic imidazole chromoionophores entrapped in silica xerogel

Kledzik K., Jamrógiewicz M., Gwiazda M., Wagner-Wysiecka E., Jezierska J., Biernat J. F., Kłonkowski A. M.

Materials Science Poland

|

2007

|

Vol. 25, No. 4

1041--1051

EN

Materials containing new chromoionophores consisting of crown residue and azole moiety as parts of macrocycles were encapsulated by the sol-gel procedure in silica xerogel matrices and proposed as chemical recognition elements especially for such metal ions as Li+, Cs+ and Cu2+. Action of these recognition elements is in principle based on changes of reflectance. The recognition elements containing 21- membered chromogenic derivatives of unsubstituted imidazole and 4-methylimidazole are able to distinguish in aqueous solution whether the Li+ concentration ratio is lower or higher than 1. In the case of Cu2+ complexes with 18-membered macrocyclic chromoionophore in which phenol residue was replaced by imidazole and 21-membered chromogenic derivative of 4-methylimidazole, values of the EPR parameters g and A suggest participation of two oxygen and two nitrogen atoms of the ligand in the equatorial plane of the tetragonally distorted octahedral environment of the central ion.

5

Characterization of Small Azocrown Ether Stereoisomers

Luboch E., Wagner-Wysiecka E., Kravtsov V., Kessler V.

Polish Journal of Chemistry

|

2003

|

Vol. 77 / nr 2

189-196

EN

The stable E- and Z-isomers of 10-membered azocrown ether have been isolated and studied by X-ray, 1H NMR and UV-Vis methods. Their structures in a solid state indicate the stretched conformation for trans-isomer and unstressed for cis-isomer. The concerted effect of azo-group _-conjugation with benzene residue and steric strain of molecular conformation results in the observed stability of isomers.

6

Macrocyclic Derivatives of Resorcinol and 1,3-Dihydroxynaphthalene. New Lithium and Sodium Selective Ionizable Chromogenic Reagents

Wagner-Wysiecka E.

Polish Journal of Chemistry

|

2001

|

Vol. 75, nr 10

1457-1463

EN

The synthesis of ionizable chromoionophores, derivatives of resorcinol and dihydroxynaphthalene has been described. Acid-base properties of these compounds were studied in a mixed, water containing solvent system. Complexation of metal cations was investigated. Selectivity for lithium and sodium ions for 18-membered and 21-membered crown ethers, respectively, was found.

7

New lithium selective chromogenic crown ethers

Wagner-Wysiecka E., Luboch E., Kłonkowski A., Biernat J.F.

Biocybernetics and Biomedical Engineering

|

2001

|

Vol. 21, no. 4

67-85

EN

New proton-dissociable crown compounds resembling mordant azo dyes were prepared and investigated. Molecules of the chromoionophores constitute of: polyoxyethylene residues and two azo chromophores forming macrocycle, and phenolic OH residue. As a proton dissociable group also azole NH groups were chosen. Many of the compounds are valuable reagents for recognition of lithium cations with largc separations of spectral bands for the ligands and their complexes with alkali metal cations. Derivatives of phenols and resorcinol selectively recognize lithium ions in dioxane-water solutions at high pH. Derivatives of azoles recognize lithium in neutral acetonitrile solutions. Stability constants of the respective complexes were determined. Thc chromoionophores with phenol residues were immobilized in an organic-inorganic hybrid xerogels. Opposite to solutions, some of these materials recognize lithium cations on contact with their neutral aqueous salt solutions.

PL

Syntezowano zdolne do oddysocjowania protonu związki koronowe o konstytucji zbliżonej do lakowych barwników azowych i badano ich właściwości. Cząsteczki tych chromojonoforów zawierają fragment polioksyetylenowy i dwa chromofory azowe tworzące makrocykl oraz fenolową grupę OH. Jako grupę zdolną do oddysocjowania protonu wybrano też resztę NH azoli. Wiele z tych związków to wartościowe odczynniki do rozpoznawania kationów litu charakteryzujące się znacznym rozdzieleniem pasm widmowych dla ligandów i ich kompleksów z kationami metali alkalicznych. Pochodne fenoli i rezorcynolu selektywnie rozpoznają jony litu w roztworach woda-dioksan przy wysokich wartościach pH. Chromojonofory z fragmentem fenolowym były immobilizowane w hybrydowych nieorganiczno-organicznych kserożelach. W odróżnieniu od roztworów, niektóre z tych materiałów rozpoznają sole litu po zetknięciu z ich obojętnymi wodnymi roztworami.