Browsing Τμήμα Χημείας / Department of Chemistry by Title
Now showing items 1189-1208 of 1320
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Article
Tailoring MgO-based supported Rh catalysts for purification of gas streams from phenol
(2012)The present work is focused on the sol-gel synthesis, characterization and catalytic performance evaluation of novel Mg-Ce-Zr-O-based mixed oxides supported Rh catalysts for the purification of H 2-rich gas streams from ...
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Article
Temperature programmed reduction of silica supported nickel catalysts
(1993)Nickel oxide promoted catalysts are prepared by simple precipitation, precipitation from homogeneous solution and impregnation methods and their reduction behavior is monitored with temperature programmed reduction (TPR) ...
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Article
Temperature-programmed desorption (TPD), reaction (TPR) and oxidation (TPO) of species formed on Rh/MgO after interaction with H2 and CO
(1991)Chemisorption and reaction of CO on a 2.5 wt. % Rh/MgO catalyst appears to be sensitive to the adsorption temperature and the extent of CO/He treatment. CO, CO2 and H2 are produced during temperature-programmed desorption ...
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Article
Template Synthesis and Single-Molecule Magnetism Properties of a Complex with Spin S = 16 and a [Mn8O8]8+ Saddle-Like Core
(2003)The compound [CeIVMn8IIIO8(O2CMe)12(H2O)4]·4H2O (1·4H2O) has been obtained from a template synthesis involving the reaction of the chain polymer {[MnIII(OH)(O2CMe)2]·(MeCO2H)·(H2O)}n (3) with Ce(IV). Compound 1 contains a ...
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Article
Temporal profiling of human urine VOCs and its potential role under the ruins of collapsed buildings
(2012)Context: The scent profile of human urine was investigated as potential source of chemical markers of human presence in collapsed buildings after natural or man-made disasters. Objective: The main goals of this study were ...
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Article
Tert-Butyl 3-(4-Cyano-5-phenylisothiazol-3-yl)carbazate
(2009)3-Iodo-5-phenylisothiazole-4-carbonitrile 1 reacts with tert-butyl carbazate via a Buchwald C-N style coupling to afford tert-butyl 3-(4-cyano-5-phenylisothiazol-3-yl)-carbazate 2 in 70% yield. © 2009 by the authors.
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Article
Tether-Directed Regioselective Synthesis of an Equatorialface Bisadduct of Azafullerene Using Cyclo-[2]-octylmalonate
(2019)Abstract Bisazafullerene (C59N)2 has been functionalized under aerobic conditions with cyclo-[2]-octylmalonate through a Mannich-type reaction, furnishing the corresponding monoadduct. A regioselective tether-directed ...
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Article
Tetraphenylhexaazaanthracenes: 16π Weakly Antiaromatic Species with Singlet Ground States
(2015)Tetraphenylhexaazaanthracene, TPHA-1, is a fluorescent zwitterionic biscyanine with a closed-shell singlet ground state. TPHA-1 overcomes its weak 16π antiaromaticity by partitioning its π system into 6π positive and 10π ...
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Article
The first polyoxomolybdenum carbonate compound: Synthesis and crystal structure of (NH4)5[(Mo2vO4) 3(μ6-CO3)(μ-CO3) 3(μ-OH)3]· 0.5CH3OH 1
(2001)The first polyoxomolybdenum carbonate has been synthesized and its single crystal structure as well as its IR, UV-vis and 13C NMR spectra have been determined.
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Article
The water-gas shift reaction on Pt/γ-Al2O3 catalyst: Operando SSITKA-DRIFTS-mass spectroscopy studies
(2008)Steady-state isotopic transient kinetic analysis (SSITKA) experiments coupled with in situ DRIFTS and mass spectrometry (operando) were performed for the first time to study essential mechanistic aspects of the water-gas ...
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Article
A theoretical study of chlorine atom and methyl radical addition to nitrogen bases: Why do Cl atoms form two-center - Three electron bonds whereas CH3 radicals form two-center - Two-electron bonds?
(1996)Ab initio molecular orbital calculations have been carried out on a series of adducts between chlorine atom and NH3, NMe3, NCl3, HN=CH2, and pyridine, and between methyl radical and HN=CH2 and pyridine. A two-center-three-electron ...
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Article
Thermal stability of solid and aqueous solutions of humic acid
(2007)The effects of temperature on the stability of a soil humic acid were studied in the present work. Solid samples of Gohy-573 humic acid (HA) and dissolved ones in aqueous solution (pH 6.0, 0.1 mol L-1 NaClO4) were investigated ...
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Article
The thermally induced phase transition of crystalline 9-cyanoanthracene dimer: A single crystal study
(1984)The crystal structure of the title compound is reported, and single crystal X-ray techniques are used to show that at temperatures close to the first exothermic peak of the title compound calorigram, a phase transition ...
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Article
Thermolyzable polymer networks and star polymers containing a novel, compact, degradable acylal-based dimethacrylate cross-linker: Synthesis, characterization, and thermolysis
(2007)A compact, cleavable acylal dimethacrylate cross-linker, 1,1-ethylenediol dimethacrylate (EDDMA), was synthesized from the anhydrous iron(III) chloride-catalyzed reaction between methacrylic anhydride and acetaldehyde. The ...
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Article
Thermoresponsive Hydrogels Based on Telechelic Polyelectrolytes: From Dynamic to “Frozen” Networks
(2018)A novel thermoresponsive gelator of (B-co-C)-b-A-b-(B-co-C) topology, comprising a poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) weak polyelectrolyte as central block, end-capped by thermosensitive poly(triethylene ...
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Book Chapter
Thirty Years of Amphiphilic Polymer Co-networks
(Royal Society of Chemistry, 2020)Amphiphilic polymer co-networks (APCNs) constitute a type of polymeric hydrogels, endowed with hydrophobic polymer segments in addition to their hydrophilic components, which results in lower aqueous swelling and, consequently, ...
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Article
Thorium adsorption by oxidized biochar fibres derived from Luffa cylindrica sponges
(2018)The present study deals with the preparation of oxidized biochar fibres derived from Luffa cylindrica sponges and the subsequent adsorption of Th(IV). The adsorption experiments were performed by batch-type experiments and ...
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Article
Thorium determination in aqueous solutions after separation by ion-exchange and liquid extraction
(2011)The concentration of thorium in aqueous samples has been determined by means of alpha-spectroscopy and UV-Vis photometry after chemical separation and pre-concentration of the actinide by cation exchange and liquid-liquid ...
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Article
Thorium determination in water samples by liquid scintillation counting after its separation by cloud point extraction
(2011)The aim of this study is the separation and pre-concentration of thorium from aqueous solutions by cloud point extraction (CPE) and its the radiometric determination by liquid scintillation counting (LSC). For CPE, tributyl ...
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Article
Thorium removal from acidic aqueous solutions by activated biochar derived from cactus fibers
(2016)The removal of thorium from acidic aqueous solutions (pH 3) by activated biochar fibers obtained from Opuntia Ficus Indica has been investigated by batch experiments as a function of the initial metal concentration, ionic ...