Browsing Τμήμα Χημείας / Department of Chemistry by Title
Now showing items 1010-1029 of 1302
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Spin-triplet excitons in 1,3-diphenyl-7-(fur-2-yl)-1,4-dihydro-1,2,4- benzotriazin-4-yl
(2013)7-(Fur-2-yl)benzotriazinyl 1 is the first example of a hydrazyl radical dimer with a thermally accessible triplet state. The triplet exciton (|D| = 0.018 cm-1, |E| = 0.001 cm-1) was observed by solid-state VT-EPR spectroscopy ...
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Article
"Squaring the clusters": A Mn III 4Ni II 4 molecular square from nickel(ii)-induced structural transformation of a Mn II/III/IV 12 cage
(2012)A Mn III 4Ni II 4 molecular square exhibiting slow magnetization relaxation has been prepared from the reaction of a Mn II 4Mn III 6Mn IV 2 cluster and a simple Ni II source. © The Royal Society of Chemistry 2012.
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Stabilization of lead sulfide nanoparticles by polyamines in aqueous solutions. A structural study of the dispersions
(2010)Lead sulfide (PbS) nanoparticles have been synthesized in aqueous solutions by a reaction between inorganic lead salts and sodium sulfide and stabilized using the cationic polyelectrolytes branched poly(ethylenimine) (PEI), ...
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Stable N- and N/S-Rich Heterocyclic Radicals: Synthesis and Applications
(2016)Over the last few decades the number of stable heterocyclic neutral radicals has dramatically increased. There have been significant efforts to use these unusual open-shell compounds in a broad array of applications that ...
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Star polymers and polymer networks containing a novel, hydrolyzable diacetal-based dimethacrylate cross-linker: Synthesis, characterization, and hydrolysis kinetics
(2007)A hydrolyzable diacetal dimethacrylate cross-linker, MOEME, was retrieved from the same product mixture where its monoacetal homologue, DMOEM, was synthesized. MOEME was copolymerized with MMA by GTP after purification, ...
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A steady-state tracing kinetic analysis of oxidative coupling of methane over Li+-doped TiO2: Mechanistic aspects of the carbon and oxygen reaction pathways to form CO2
(1994)A steady-state tracing kinetic study of the oxidative coupling of methane reaction at 800°C over Li+-doped TiO2 catalyst was performed. In particular, the carbon and oxygen reaction pathways which lead to the formation of ...
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The steam reforming of phenol over natural calcite materials
(2009)Five natural calcite materials of different geographical origin were studied towards the steam reforming of phenol reaction and the activity results obtained were correlated with some of their physico-chemical properties. ...
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The steam reforming of phenol reaction over supported-Rh catalysts
(2004)The steam reforming of phenol reaction towards H2 production was studied in the 575-730°C range over Rh supported on CeO2, ZrO2 and SiO2 single metal oxides and various mixed metal oxides such as CeO2-SiO2, ZrO2-SiO2 and ...
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Stereochemistry of the [4 + 2] cycloadditions of trans,trans- and cis,trans-2,4-hexadiene to C60
(2002)The [4 + 2] cycloaddition of trans,trans-2,4-hexadiene with C60 proceeds via a concerted mechanism with retention of stereochemistry in the cycloadduct 1a. However, when cis,trans-2,4-hexadiene reacts with C60, isomerization ...
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Stimuli-Responsive amphiphilic polyelectrolyte heptablock copolymer physical hydrogels: An unusual ph-response
(2012)An amphiphilic cationic polyelectrolyte based on poly[2-(dimethylamino) ethyl methacrylate] (polyDMA) and poly(n-butyl methacrylate) (polyBuMA) with a BuMA-DMA-BuMA-DMA-BuMA-DMA-BuMA heptablock copolymer architecture was ...
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Stoichiometric mass-action ion-exchange model explicit isotherms for mono-, di-, tri- and tetrameric ions
(1995)Analytical isotherms for the unhindered stoichiometric mass-action ion exchange of monomeric, dimeric, trimeric and tetrameric ions are derived. The linear increase in oligomer charge from 1 to 4 leads to an exponential ...
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Structural and electron paramagnetic resonance (EPR) characterization of novel vanadium(V/IV) complexes with hydroquinonate-iminodiacetate ligands exhibiting "noninnocent" activity
(2013)Reaction of KVO3 with 2-[N,N′-(carboxymethyl)aminomethyl]-5-methylhydroquinone (H4mecah) in aqueous solution at pH 8.2 results in the isolation of mononuclear K2[VV(O)2{Hmecah(-3)}]·2H2O complex. On the other hand, reaction ...
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Structural and Redox Properties of Ce1-xZrxO2-δ and Ce0.8Zr0.15RE0.05O2-δ (RE: La, Nd, Pr, Y) Solids Studied by High Temperature in Situ Raman Spectroscopy
(2017)In situ Raman spectroscopy at temperatures up to 450 °C is used to probe the structural and redox properties of Ce1-xZrxO2-δ solids (x = 0-0.8) prepared by the citrate sol-gel and coprecipitation with urea methods. The ...
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Structural architectures and biological properties of main group bismuth(III) iodide complexes with heterocyclic thioamides
(2019)A series of mononuclear, dinuclear and polynuclear bismuth(III) iodide complexes (1–5) bearing heterocyclic thioamide ligands, 2-mercapto-3,4,5,6-tetrahydro-pyrimidine (tHPMT), 2-mercapto-benzimidazole (MBZIM), ...
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Structural characterization of amphiphilic polymer conetworks end-linked with the optimal amount of cross-linker
(2010)Amphiphilic polymer conetworks were synthesized by the end-linking of ABA triblock copolymers using optimal (minimal) amount of cross-linker in pursuit of nanoscale phase separated materials with a long-range order. ...
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Structural characterization of glassy and rubbery model anionic amphiphilic polymer conetworks
(2008)The structure of two series of model amphiphilic polymer conetworks based on the hydrophilic anionic methacrylic acid was characterized by atomic force microscopy (AFM) and small-angle neutron scattering (SANS). In the ...
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Structural characterization of the {3[BPMTU]+• 3[X] -• nH2O} salts (BPMTU = 1,3-bis(3-pyridylmethyl)-2- thiourea and X = Cl, Br, I). A polychlorine network based on O⋯Cl - and OH⋯Cl- interactions
(2011)Ionic salts with the formulae {3[BPMTU]+ 3[X]- nH2O} (BPMTU = 1,3-bis(3-pyridylmethyl)-2-thiourea, X = Cl - and n = 1.5 (1), X = Br-and n = 1 (2), X = I- and n = 1 (3)) were synthesized. The compounds have been characterized ...
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Structural characterization, hydrolytic stability and dynamics of cis-MoVIO22+ hydroquinonate/phenolate complexes
(2018)Although, the investigation of the interactions of MoVI ion with the “non-innocent” phenols/hydroquinones is essential for the understanding of the role of molybdenum in the biological systems, the MoVI complexes of ...
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Structural dynamics of heme-copper oxidases and nitric oxide reductases: Time-resolved step-scan Fourier transform infrared and time-resolved resonance Raman studies
(2005)Of the spectroscopic methods available for the characterization of the dynamics of heme protein active sites, time-resolved resonance Raman spectroscopy (TR3) is a powerful technique because excitation within the heme π-π* ...
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Structural effects of crosslinking a biopolymer hydrogel derived from marine mussel adhesive protein
(2006)In an effort to explore new biocompatible substrates for biomedical technologies, we present a structural study on a crosslinked gelatinous protein extracted from marine mussels. Prior studies have shown the importance of ...