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Now showing items 221-240 of 244

Taming ring morphology in 2D Co(OH)2 Liesegang patterns

Shreif Z.; Mandalian L.; Abi-Haydar A.; Sultan R. (, 2004)

We present here novel expermients on the formation of Liesegang rings in 2D. We consider the system of propagating Co(OH)2 bands studied extensively in 1D, from the viewpoint of a large number of considerations. In this ...
The davis-beirut reaction: A novel entry into 2h-indazoles and indazolones. Recent biological activity of indazoles

Haddadin M.J.; Conrad W.E.; Kurth M.J. (SHARJAHEXECUTIVE STE Y-2, PO BOX 7917, SAIF ZONE, 1200 BR SHARJAH, U ARAB EMIRATES, 2012)

A novel, easy method for the syntheses of richly diversified 2H-indazoles and indazolones, called the Davis-Beirut reaction, and other recent 2H-indazole synthetic routes are briefly reviewed. An update on the biological ...
The Davis-Beirut reaction: N 1, N 2-disubstituted-1 H-indazolones via 1,6-electrophilic addition to 3-alkoxy-2 H-indazoles

Conrad W.E.; Fukazawa R.; Haddadin M.J.; Kurth M.J. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2011)

A variety of electrophiles (anhydrides, acid chlorides, carbonochloridates, sulfonyl chlorides, and alkyl bromides) react with 3-methoxy-2H-indazole (1a), benzoxazin[3,2-b]indazole (1d), and oxazolino[3,2-b]indazole (1e) ...
The quinoxaline di-N-oxide DCQ blocks breast cancer metastasis in vitro and in vivo by targeting the hypoxia inducible factor-1 pathway

Ghattass K.; El-Sitt S.; Zibara K.; Rayes S.; Haddadin M.J.; El-Sabban M.; Gali-Muhtasib H. (LONDON236 GRAYS INN RD, FLOOR 6, LONDON WC1X 8HL, ENGLAND, 2014)

Background: Although tumor hypoxia poses challenges against conventional cancer treatments, it provides a therapeutic target for hypoxia-activated drugs. Here, we studied the effect of the hypoxia-activated synthetic ...
Theoretical calculation of the low-lying electronic states of the molecule YS

Korek M.; Farhat A.; Abdul-Al S.N. (, 2010)

The potential energy curves have been investigated for the 25 lowest electronic states in the 2s+1Λ (±) representation of the molecule YS via complete active space self-consistent field. Multireference configuration ...
Theoretical modeling of front propagation of CdS nanoparticles in a gel

Al-Ghoul M.; Ghaddar T. (STAFA-ZUERICHLAUBISRUTISTR 24, STAFA-ZUERICH, CH-8712, SWITZERLAND, 2010)

We report a theoretical model to describe the spatiotemporal dynamics of a new system consisting of sulfide ions diffusing into an organic gel containing mercaptoethanol-capped cadmium ions. The product, cadmium sulfide, ...
Theoretical structure-reactivity study of ethylene insertion into nickel-alkyl bonds. A kinetically significant and unanticipated role of trans influence in determining agostic bond strengths

Hasanayn F.; Achord P.; Braunstein P.; Magnier H.J.; Krogh-Jespersen K.; Goldman A.S. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2012)

Theoretical methods (B3LYP, M06, and CCSD(T)) have been used to study the kinetics and thermodynamics of ethyl migratory insertion in a series of square-planar [(X Y)Ni(ethyl)(ethylene)] complexes (X Y = anionic bidentate ...
Therapeutic potential of flavonoids in cancer: ROS-mediated mechanisms

Slika, H.; Mansour, H.; Wehbe, N.; Nasser, S.A.; Iratni, R.; Nasrallah, G.; Shaito, A.; Ghaddar, T.; Kobeissy, F.; Eid, A.H (Elsevier Masson s.r.l, 2022)

Cancer is a leading cause of morbidity and mortality around the globe. Reactive oxygen species (ROS) play contradicting roles in cancer incidence and progression. Antioxidants have attracted attention as emerging therapeutic ...
Thin film microstructure of a solution processable pyrene-based organic semiconductor

Lucas L.A.; DeLongchamp D.M.; Richter L.J.; Kline R.J.; Fischer D.A.; Kaafarani B.R.; Jabbour G.E. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2008)

Semiconducting 6,7,15,16-tetrakis(dodecylthio)quinoxalino[2′, 3′:9,10]phenanthro[4,5-abc]phenazine (TQPP-12) has been synthesized as a candidate solution-processable semiconductor for organic electronics applications. We ...
Thin film microstructure of solution processable pyrene-based small molecules for electronic applications

Lucas L.A.; DeLongchamp D.M.; Richter L.J.; Kline R.J.; Fischer D.A.; Kaafarani B.R.; Jabbour G.E. (, 2007)

[No abstract available]
Time resolved study of three ruthenium(II) complexes at micellar surfaces: A new long excited state lifetime probe for determining critical micelle concentration of surfactant nano-aggregates

Patra, D.; Chaaban, A.H.; Darwish, S.; Saad, H.A.; Nehme, A.S.; Ghaddar, T.H. (Elsevier, 2016)

Three different ruthenium complexes have been synthesized and their luminescence properties in different solvent environments are reported. Luminescence intensities and excited state lifetimes of Ru-I, Ru-II and Ru-III ...
Time-resolved fluorescence study during denaturation and renaturation of curcumin-myoglobin complex

Patra D.; Barakat C. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2012)

Curcumin influences the transition point, the concentration of denaturant required to effect 50percent of the total change, of myoglobin denaturation. Curcumin enhances absorbance of myoglobin at 280nm with a binding ...
Transannular anti-Michael addition: formation of 4H-pyrazolo[5,1-c]thiazines

Suen Y.F.; Hope H.; Nantz M.H.; Haddadin M.J.; Kurth M.J. (OXFORDTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2006)

The reaction of 2-(diphenylmethylene)thietan-3-one (2) with 1,2,4,5-tetrazines (3a-c) in KOH-MeOH-THF gives 4H-pyrazolo[5,1-c]thiazines (7a-c). This novel condensation reaction proceeds via the intermediacy of an ...
Two polymorphs of phenanthro[4,5-abc]phenazine-18-crown-6: Preparation, X-ray diffraction and DFT studies

Fonari A.; Jradi F.M.; Fonari M.S.; Al-Sayah M.H.; Antipin M.Y.; Kaafarani B.R.; Timofeeva T.V. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2011)

Phenanthro[4,5-abc]phenazine-18-crown-6 chromophore (1) was synthesized, and its two polymorphic modifications were obtained by recrystallization from dichloromethane-methanol and dichloromethane-hexane solvent mixtures. ...
Two simple protocols for the preparation of diallylaminoethyl-substituted nucleic bases: A comparison

Shatila R.S.; Bouhadir K.H. (OXFORDTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2006)

The syntheses of pyrimidine and purine nucleic bases substituted with diallylaminoethyl groups are reported following two different protocols. A comparison is made between the yield, expense, and difficulty of each route. ...
Unique role of ionic liquid [bmin][BF 4] during curcumin-surfactant association and micellization of cationic, anionic and non-ionic surfactant solutions

Patra D.; Barakat C. (OXFORDTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2011)

Hydrophilic ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroburate, modified the properties of aqueous surfactant solutions associated with curcumin. Because of potential pharmaceutical applications as an antioxidant, ...
Universal low-temperature MWCNT-COOH-based counter electrode and a new thiolate-disulfide electrolyte system for dye-sensitized solar cells

Hilmi A.; Shoker T.A.; Ghaddar T.H. (American Chemical Society; WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2014)

A new thiolate-disulfide organic-based electrolyte system composed of the tetrabutylammonium salt of 2-methyl-5-trifluoromethyl-2H-[1,2,4]triazole-3-thiol (S-) and its oxidized form 3,3′-dithiobis(2-methyl-5- trifluorome ...
Unusual friedlander reactions: A route to novel quinoxaline-based heterocycles

Shoker T.A.; Ghattass K.I.; Fettinger J.C.; Kurth M.J.; Haddadin M.J. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2012)

Acid catalyzed Friedlander reactions of a number of 2,3-dihydro-1H- cyclopenta[b]quinoxaline-1-ones with 2-aminobenzaldehyde yield, unexpectedly, 8H-indolo[3,2-a]phenazine and quinolino[2,3-c]cyclopentadienone[2,3-b] ...
Uptake of acid pollutants by mineral dust and their effect on aerosol solubility

Saliba N.A.; Chamseddine A. (OXFORDTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2012)

Due to the implications caused by mineral dust and sea-salt heterogeneous reactions with SO2, NOx and NH3 derivatives, this study aims to understand the interaction between gaseous and particulate phases; PM10 and PM2.5, ...
Vertex-based finite volume simulation of Liesegang patterns on structureless meshes

Abi Mansour A.; Al-Ghoul M. (American Physical Society; COLLEGE PKONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, 2014)

A computational method is suggested for the simulation of Liesegang patterns in two dimensions on structureless meshes. The method is based on a model that incorporates dynamical equations for the nucleation and growth of ...

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Browsing Department of Chemistry - Faculty Publications by Title

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