Wyniki wyszukiwania - BazTech

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Recognition Material for Cu(II) Ions Based on Photoinduced Electron Transfer and Surface Plasmon Resonance Effects

Orłowska M., Kledzik K., Mroczkiewicz M., Ostaszewski R., Kłonkowski A. M.

Polish Journal of Chemistry

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2008

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Vol. 82, nr 6

1289-1293

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Enhancement of 5D4 → 7FJ Luminescence in Tb(III) in the Vicinity of Ag Nanoparticles in Silica Xerogel

Lipowska B., Kledzik K., Kłonkowski A. M.

Polish Journal of Chemistry

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2008

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Vol. 82, nr 6

1295-1298

3

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

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2007

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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.

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Zastosowanie spektroskopii TOF-SIMS w charakterystyce katalizatorów Pd/SiO2 otrzymanych metodą zol-żel

Karski S., Ludomirska I., Proga H., Szynkowska M.I., Witońska I., Kłonkowski A.M., Kledzik K.

Przemysł Chemiczny

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2006

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T. 85, nr 1

33-37

PL

Zbadano wpływ warunków preparatyki katalizatorów Pd/SiO2 otrzymanych metodą zol-żel na ich aktywność i selektywność w procesie redukcji aldehydu krotonowego. Do analizy powierzchni katalizatora użyto spektrometru TOF– SIMS, co umożliwiło wizualizację powierzchni, określenie składu chemicznego oraz segregację warstw powierzchniowych katalizatora w zależności od temperatury kalcynacji i redukcji, i w konsekwencji dobranie optymalnych warunków preparatyki.

EN

Catalyst activity and selectivity were tested in the redn. (100°C/2 hrs.) of crotonaldehyde satd. vapors in 0.03 l. H2/ min in relation to the 5%Pd/SiO2 prepn. history, esp. to calcination at 300, 500, or 700°C in Ar and at 300 or 500°C in H2 just before the reaction. The 500 and 300°C, resp., resulted in Pd distributed uniformly on the SiO2 surface, a factor crit. for catalyst’s high activity. TOF-SIMS found CH3+, CH3O+, C2H5, and SiCH3+ on the catalyst surface, but calcination at 500 or 700°C removed most of the org. fragments. The H2-treatment at 500–700°C, resulted in Pd clusters nonuniformly distributed (TOF–SIMS) on the surface and in a less active catalyst.