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Now showing items 60-79 of 244

Davis-Beirut reaction: Route to thiazolo-, thiazino-, and thiazepino-2 h -indazoles

Farber K.M.; Haddadin M.J.; Kurth M.J. (American Chemical Society; WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2014)

Methods for the construction of thiazolo-, thiazino-, and thiazepino-2H-indazoles from o-nitrobenzaldehydes or o-nitrobenzyl bromides and S-trityl-protected 1°-aminothioalkanes are reported. The process consists of formation ...
Degradation of aqueous carbamazepine in ultrasonic-Fe0-H2O2 systems

Ghauch A.; Baydoun H.; Dermesropian P. (LAUSANNEPO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2011)

This study investigated the suitability of carbamazepine (CBZ) oxidation by an improved Fenton's process. CBZ (42μM) is used as probe for non-halogenated pharmaceuticals. The experiments were performed at room temperature ...
Degradation of sulfamethoxazole by persulfate assisted micrometric Fe0 in aqueous solution

Ghauch A.; Ayoub G.; Naim S. (LAUSANNEPO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2013)

Persulfate (PS) chemical activation using micrometric Fe0 particles (MIPs) was tested on sulfamethoxazole (SMX) solution (39.5μM). MIPs load (0.89-17.85mM), PS content (0.4-1.0mM), pH (5.50-8.30) and alkalinity (bicarbonate) ...
Density, fractal angle, and fractal dimension in linear Zn electrodeposition morphology

Saab R.; Sultan R. (BERLINGENTHINER STRASSE 13, D-10785 BERLIN, GERMANY, 2005)

In this paper, we explore some aspects of the formation of tree-like structures (dendrites) with branching and ramifications in Zn electrodeposition systems. A special cell is designed wherein dendrites are grown between ...
Design, synthesis, and properties of new derivatives of pentacene

Jiang J.; Kaafarani B.R.; Neckers D.C. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2006)

Stable, soluble ethynylated derivatives of pentacene (9a-c) were synthesized, and the ethynyl moieties on the terminal rings were used to tune the electronic properties of these compounds. Their oxidation potentials are ...
DFT study of the geometry and energy order of the low singlet and triplet states of [d4-η5-CpMo(CO)2X] 16-electron complexes (X = halogen, CN, H, and CH3)

Hasanayn F.; Markarian M.-Z.; Al-Rifai R. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2004)

DFT methods have been used to investigate the dependence of the geometry and energy order of the low energy states of [d4-η 5-CpMo(CO)2X] 16-electron complexes on X (X = halogen, CN, H and CH3). The calculations use a ...
DFT study of the products, potential energy surface, and substituent effects for methyl radical addition to [Rh(PMe3)2(CO)X] (X = halogen or CN)

Nsouli N.H.; Mouawad I.; Hasanayn F. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2008)

Methyl radical addition to [trans-Rh(PMe3)2(CO)Cl] (1) has been studied using density functional theory utilizing ECPs on the heavy elements. At the B3LYP level, ΔH298 for the transformation from separate reactants to the ...
DFT study of the transition states and products of methyl radical addition to olefins coordinated in an asymmetrical mode to [Cp2Zr(O tBu)]+: Predictions of reversed regioselectivities compared to the noncoordinated reactions

Hasanayn F.; El-Makkaoui M.S. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2009)

The addition of free alkyl radicals to olefins is known to encounter a small activation energy and to be highly regioselective, typically favoring the less substituted carbon of the double bond. The ability to modify the ...
Diarylpyrenes vs. diaryltetrahydropyrenes: Crystal structures, fluorescence, and upconversion photochemistry

El-Ballouli A.O.; Khnayzer R.S.; Khalife J.C.; Fonari A.; Hallal K.M.; Timofeeva T.V.; Patra D.; Castellano F.N.; Wex B.; Kaafarani B.R. (LAUSANNEPO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2013)

The synthesis of two series of substituted 2,7-diaryl-4,5,9,10- tetrahydropyrenes (1a-c) and 2,7-diarylpyrenes (2a-c) is reported; the opposing phenyl tips being terminated with tBu (a), OCH3 (b), or F (c) to impart variation ...
Diazocinones: Synthesis and conformational analysis

Robins L.I.; Carpenter R.D.; Fettinger J.C.; Haddadin M.J.; Tinti D.S.; Kurth M.J. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2006)

1,2,4,5-Tetrazines (prepared from aryl nitriles) condense with isoxazolylcyclobutanones (prepared from 3-benzenesulfonyl-3-vinylcyclobutanol) in methanolic KOH to give conformationally restricted 6-isoxazol-5-yl-6,7- ...
Direct H-OR and OR-OR′ metathesis pathways in ester hydrogenation and transesterification by Milstein's catalyst

Hasanayn F.; Baroudi A. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2013)

Using DFT calculations we identify a low-energy reaction path connecting methyl acetate and Milstein's trans-[Ru(H)2(PNN)(CO)] catalyst directly with acetaldehyde and trans-[Ru(H)(OMe)(PNN)(CO)]. The transformation represents ...
Discotic liquid crystals for opto-electronic applications

Kaafarani B.R. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2011)

Discotic liquid crystals (DLCs) have been exploited in opto-electronic devices for their advantageous properties including long-range self-assembling, self-healing, ease of processing, solubility in a variety of organic ...
Discussion of Chicgoua Noubactep on Removal of thiobencarb in aqueous solution by zero valent iron by Md. Nurul Amin et al. [Chemosphere 70 (3) (2008) 511-515]

Ghauch A. (OXFORDTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2008)

The following comments are proposed to clarify some related issues on the use of zero valent iron micrometric particles for the treatment of a thiobencarb pesticide solution published in a recent article by Nurul Amin et ...
Distinguishing motor oils at higher concentration range by evaluating total fluorescence quantum yield as a novel sensing tool

Patra D. (LAUSANNEPO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2008)

Recently we developed a fluorescence-based fiber optic sensor for polycyclic aromatic hydrocarbons (PAHs) detection and subsequently methods were developed for studying multi-fluorophoric systems at higher concentration ...
Do counter electrodes on metal substrateswork with cobalt complex based electrolyte in dye sensitized solar cells?

Miettunen K.; Saukkonen T.; Li X.; Law C.; Sheng Y.K.; Halme J.; Tiihonen A.; Barnes P.R.F.; Ghaddar T.; Asghar I.; Lund P.; O'Reganb B.C. (PENNINGTON65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA, 2013)

Yes. Testing 7 different metals as a substrate for a counter electrode in dye sensitized solar cells (DSSC) showed that some metals can be a good option for use with cobalt electrolyte. It was found that Stainless steels ...
Dye adsorption, desorption, and distribution in mesoporous TiO2 films, and its effects on recombination losses in dye sensitized solar cells

O'Regan B.; Xiaoe L.; Ghaddar T. (CAMBRIDGETHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND, 2012)

Recombination rates through bare, partially dyed, and fully dyed mesoporous TiO2 films have been measured, as well as the penetration kinetics of dye molecules into the films. We give evidence that homogeneous partial dye ...
Dynamical profiles of the reactive components in direct and revert Liesegang patterns

Kalash L.; Farah H.; Eddin A.Z.; Sultan R. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2013)

In periodic precipitation (Liesegang banding), the overwhelmingly common trend is the increase in spacing between consecutive bands as we move away from the interface. Revert spacing is a rare trend observed in a few ...
Dynamics of a complex diffusion-precipitation-re-dissolution Liesegang pattern

Msharrafieh M.; Sultan R. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2006)

A complex behavior in a Liesegang system involving the precipitates Co(OH)2 and Ni(OH)2 is reported. Under a special choice of initial cation concentrations (Experiment III), a sequence of three band domains: BA (thin-medium), ...
Eco-Friendly Aqueous Dye-Sensitized Solar Cell with a Copper(I/II) Electrolyte System: Efficient Performance under Ambient Light Conditions

Jilakian, M.; Ghaddar, T.H. (American Chemical Society, 2022)

Organic solvents used in electrolytes of dye-sensitized solar cells (DSCs) are generally toxic and not environmentally safe, which renders their use, especially in indoor solar modules, difficult. In this paper, an ...
Effect of an alternating current electric field on Co(OH)2 periodic precipitation

Karam T.; Sultan R. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2013)

The present paper studies the effect of an alternating current (AC) electric field on Co(OH)2 Liesegang patterns. In the presence of an AC electric field, the band spacing increases with spacing number, but reaches a plateau ...

Now showing items 60-79 of 244

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Browsing Department of Chemistry - Faculty Publications by Title

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