Central European Journal of Chemistry
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Fluorescent chemosensors for metal ions based on 3-(2-benzoxazol-5-yl)alanine skeleton
Central European Journal of Chemistry - Tập 8 - Trang 674-686 - 2010
The ability of new chelate ligands, benzoxazol-5-yl-alanine derivatives substituted in position 2 by heteroaromatic substituent, to form complexes with selected metal ions in acetonitrile are studied by means of absorption and steady-state and time-resolved fluorescence spectroscopy. Among the ligands studied, only azaaromatic derivatives form stable complexes with transition metal ions in the gro...... hiện toàn bộ
Inclusion compounds of cystostatic active (C5H5)2VCl2 and (CH3C5H4)2VCl2 with α-, β- and γ-cyclodextrines: Synthesis, EPR study and microbiological behavior toward Escherichia coli
Central European Journal of Chemistry - Tập 3 - Trang 72-81 - 2005
The inclusion of vanadocene dichloride (VDC) and 1,1′-dimethyl vanadocene dichloride (MeVDC) into cyclodextrines (α-CD, β-CD and γ-CD) was studied by EPR spectroscopy. It was found that VDC and MeVDC with β-CD and γ-CD form true inclusion compounds, but with α-CD, VDC and MeVDC gave only fine dispersion mixtures. The inclusion was validated by anisotropic EPR spectra of solid samples. In addition,...... hiện toàn bộ
Effects of dissolved metal chlorides on the behavior of silica nanoparticles in aqueous media
Central European Journal of Chemistry - Tập 12 - Trang 480-491 - 2014
Effects of chlorides of univalent (LiCl, NaCl, KCl), bivalent (MgCl2, BaCl2) and trivalent (AlCl3) metals at different concentration (0.001–0.1 M) on the behavior of nanosilica A-200 (0.5–5 wt.%) in aqueous media are analyzed using photon correlation spectroscopy (particle size distribution, PSD), electrophoresis (zeta potential ζ), potentiometric titration (surface charge density), and estimation...... hiện toàn bộ
New N-aryloxy-phthalimide derivatives. Synthesis, physico-chemical properties, and QSPR studies
Central European Journal of Chemistry - Tập 8 - Trang 789-796 - 2010
Starting from N-hydroxyphthalimide 1 and the reactive fluoro- or chloro-nitroaryl derivatives 2, 3 and 4a-e (2-chloro-3,5-dinitropyridine; 3, NBD-chloride; 4a, 1-fluoro-2,4-dinitrobenzene; 4b, picryl chloride; 4c, 4-chloro-3,5-dinitrobenzotrifluoride; 4d, 2-chloro-3,5- dinitrobenzotrifluoride; 4e, 4-chloro-3,5-dinitrobenzoic acid) the corresponding N-(2-nitroaryloxy)-phthalimide derivatives 5a-e, ...... hiện toàn bộ
Thermodynamic description of the Cu-Ni-Pb system
Central European Journal of Chemistry - - 2011
Thermodynamic description is presented for the ternary Cu-Ni-Pb system. Optimized parameters of the sub-systems, Cu-Ni, Cu-Pb and Ni-Pb, are taken from earlier assessments and those of the ternary system are optimized in this study by using the experimental phase equilibrium and thermodynamic data. Better agreement is obtained by the present optimization. Calculated results are compared with the o...... hiện toàn bộ
Modified silica surface by phenylboronic acid derivatives as effective sugar sensor
Central European Journal of Chemistry - Tập 7 - Trang 697-701 - 2009
Silica surface was modified with phenylboronic acid derivatives. The structures of the functionalized supports were characterized by FT-IR spectroscopy, 13C CP/MAS NMR spectrometry, elemental and thermogravimetric analysis. The solid supports were effectively applied as artificial receptors for sugars in aqueous solutions. Alizarin Red S. (ARS) was used to detect colour change upon carbohydrate (s...... hiện toàn bộ
Transport properties of PVA/PEI/PEG composite membranes: sorption and permeation characterizations
Central European Journal of Chemistry - Tập 6 - Trang 634-640 - 2008
Poly(vinylalcohol)/poly(ethyleneglycol)/poly(ethyleneimine) blend membranes were prepared by solution casting followed by solvent evaporation. The chemical structure of the prepared membranes was analyzed by FTIR and DSC. The sorption behavior as well as the permeabilities of the membranes for pure CO2 and N2 were investigated. The results show that the PVA/PEI/PEG membranes possess a higher perme...... hiện toàn bộ
Characterization of polymeric system for cisplatin delivery — analytical methods for Pt determination
Central European Journal of Chemistry - Tập 11 - Trang 1548-1553 - 2013
Cis-diamminedichloroplatinum(II) (cisplatin) was immobilized in a star-shaped polymer carrier. In order to define whether this polymer could be used as a drug delivery system for cisplatin, its characteristics, e.g. loading efficiency and release profile of cisplatin from the polymer in phosphate buffered saline (PBS), have to be assessed, and hence an appropriate analytical procedure for precise ...... hiện toàn bộ
Influence of the addition of Pd and Cu to cobalt catalysts prepared by SMAI for F-T synthesis
Central European Journal of Chemistry - Tập 5 - Trang 144-155 - 2007
The Co-Pd/SiO2 and Co-Cu/SiO2 catalysts were prepared via solvated metal atom impregnation (SMAI) method and investigated for the Fischer-Tropsch (F-T) synthesis. The catalysts contained 5wt.% Co and a weight ratio of Pd (or Cu) to Co of 1/30. XPS indicated that Co, Pd and Cu were in metallic state. The results of XPS and magnetic measurements showed that Co and Pd (Cu) were alloyed. The Co partic...... hiện toàn bộ
Flow injection analysis of ethambutol in synthetic urine using a graphite-polyurethane composite electrode as an amperometric detector
Central European Journal of Chemistry - - 2013
Ethambutol (ETB) is a first-line antitubercular drug effective against actively growing Mycobacterium tuberculosis. Resistance of the mycobacterium to ethambutol among tuberculosis (TB) patients results from inadequate or inappropriate dosing of treatment or using low quality medication. It is therefore necessary to develop reliable methods for determining ethambutol metabolic profiles of patients...... hiện toàn bộ
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