Browsing Τμήμα Χημείας / Department of Chemistry by Title
Now showing items 760-779 of 1302
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Article
p-Hydroquinone-metal compounds: Synthesis and crystal structure of two novel VV-p-hydroquinonate and VIV-p-semiquinonate species
(2002)Reaction of the p-hydroquinone derivative H2Na4bicah·4H2O with either VIVOSO4·3H2O and NaVVO3 in equivalent quantities or with NaVVO3 yields the tetranuclear VIVO2+ macrocycle-semiquinonate compound Na6{(VIVO)4-(μ2-O) ...
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Article
p-phenylenecarbenonitrene and its halogen derivatives: How does resonance interaction between a nitrene and a carbene center affect the overall electronic configuration?
(2001)A series of para-conjugatively coupled phenylenecarbenonitrenes {(4-nitrenophenyl)methylene (3a), (4-nitrenophenyl)fluoromethylene (3b), (4-nitrenophenyl)chloromethylene (3c), and (4-nitrenophenyl)bromomethylene (3d)} were ...
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Article
Palladium catalyzed C-C coupling reactions of 3,5-dichloro-4 H -1,2,6-thiadiazin-4-one
(2011)Palladium catalyzed Suzuki-Miyaura, Stille, and Sonogashira coupling reactions are reported for the electron-deficient heterocyclic scaffold 3,5-dichloro-4H-1,2,6-thiadiazin-4-one (1). Furthermore, 3,5-di(thien-2-yl)-4H- ...
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Article
Partial oxidation of methane to synthesis gas over Ru/TiO2 catalysts
(1996)The catalytic partial oxidation of methane to synthesis gas is investigated over Group VIII metal catalysts. It is shown that while all catalysts promote methane combustion followed by reforming with H2O and CO2, the Ru/TiO2 ...
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Article
Partial oxidation of methane to synthesis gas over supported ruthenium catalysts
(1997)The partial oxidation of methane to synthesis gas has been investigated over Ru supported on SiO2, γ-Al2O3, YSZ (Yttria-stabilized zirconia) and TiO2 catalysts in the temperature range of 550-750°C. The results show that ...
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Conference Object
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Article
Pd-catalyzed C-N coupling of primary (het)arylamines with 5-substituted 3-chloro-4H-1,2,6-thiadiazin-4-ones
(2018)The Buchwald-Hartwig Pd-catalyzed C-N coupling reaction of 5-substituted 3-chloro-4H-1,2,6-thiadiazin-4-ones with primary (het)arylamines is described, affording twenty new 3,5-disubstituted 4H-1,2,6-thiadiazin-4-ones in ...
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Article
Pentanuclear complexes with unusual structural topologies from the initial use of two aliphatic amino-alcohol ligands in Fe chemistry
(2012)Five novel pentanuclear Fe 3+ clusters with the aliphatic amino-alcohol ligands 3-amino-1-propanol (Hap) and 2-(hydroxymethyl)piperidine (Hhmpip) [Fe 5(μ 3-Ο) 2(L) 4(O 2CR) 7] [L = ap -, R = Ph (1)
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Article
Perchlorophenalenyl radical
(2001)We report the preparation and solid-state characterization of the perchlorophenalenyl radical (1). The radical is initially obtained as a yellow-green solid by reduction of the perchlorophenalenium salt (12+). This solid ...
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Article
Perchlorophenalenyl radical, C13Cl9: A modulated structure with nine threefold-symmetric molecules in the asymmetric unit
(2001)The odd-alternant perchlorophenalenyl radical, C13Cl9, forms molecular stacks centered on crystallographic threefold rotation axes, but the spacing within the stacks (3.78 Å) is too large to allow good overlap of the ...
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Article
Permeation profiles of potential urine-borne biomarkers of human presence over brick and concrete
(2012)Headspace solid phase micro-extraction gas chromatography-mass spectrometry (SPME-GC-MS) analysis was performed over an in-house made filling chamber loaded with brick or concrete, mimicking a potential entrapment scene ...
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Article
PH-potentiometric investigation towards chelating tendencies of p -hydroquinone and phenol iminodiacetate copper(II) complexes
(2010)Copper ions in the active sites of several proteins/enzymes interact with phenols and quinones, and this interaction is associated to the reactivity of the enzymes. In this study the speciation of the Cu 2+ with iminodiacetic ...
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Article
Phase behavior of random and ABC triblock methacrylic polyampholytes with poly(vinyl alcohol) in water: effect of pH and salt
(1995)ABC triblock and random methacrylic polyampholytes of molecular weight 4,000 g mol-1 with various base-neutral-acid compositions were examined for their phase separation behavior, each in an aqueous mixture with poly(vinyl ...
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Article
The phenol steam reforming reaction over MgO-based supported Rh catalysts
(2004)The phenol steam reforming reaction toward H2 formation has been investigated in the 575-730°C range over MgO, CeO2, and ZrO 2 single metal oxides and various mixed metal oxides such as Mg-Ce-O, Mg-Zr-O, and Mg-Ce-Zr-O, ...
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Article
The phenol steam reforming reaction towards H2 production on natural calcite
(2009)The steam reforming of phenol towards H2 production was studied in the 650-800 °C range over a natural pre-calcined (air, 850 °C) calcite material. The effects of reaction temperature, water, hydrogen, and carbon dioxide ...
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Article
Phenyl radical, cation, and anion. The triplet-singlet gap and higher excited states of the phenyl cation
(1997)High-level ab initio molecular orbital calculations have been carried out for the phenyl cation (1), the phenyl radical (2), and the phenyl anion (3). Our best estimate for the heat of formation (ΔH(f298)) of the phenyl ...
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Article
Phonon spectroscopy of photochemical reactions in organic solids: Photodimerization of 2-benzyl-5-benzylidenecyclopentanone and photopolymerization of 2,5-distyrylpyrazine
(1982)The nature of the photoreactions in 2-benzyl-5-benzylidenecyclopentanone (abbreviated as BBCP) and 2,5-distyrylpyrazine (abbreviated as DSP) is investigated by a combination of Raman spectroscopy and electronic spectroscopy. ...
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Book Chapter
Phospholipid aggregates as model systems to understand ion-specific effects: Experiments and models
(World Scientific Publishing Co., 2009)The Langmuir monolayers and bilayer stacks of zwitterionic phospholipids have been recently used as model systems to understand specific anionic effects. Simple thermodynamic experiments coupled to theoretical considerations ...
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Article
Photochemistry of an azido-functionalized cryptand: Controlling the reactivity of an extremely long-lived singlet aryl nitrene by complexation to alkali cations
(2005)Photolysis of the cryptand 1, bearing an intraannular azido substituent, results in a complex photochemistry. Low-temperature photolysis yields the triplet nitrene 32, which has been characterized by EPR spectroscopy. Small ...
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Article
PHOTODIMERISATION OF CRYSTALLINE 2,5-DIBENZYLIDENECYCLOPENTANONE.
(1982)The solid state photocycloaddition of 2,5-dibenzylidenecyclopentanone and the photostability of 2,5-dibenzylidene-methylcyclopentanone were used to show that topochemical reaction may proceed in crystals in which the ...