A5060015849- Organic Electronics and Photovoltaics
- Luminescence and Fluorescent Materials
- Organic Light-Emitting Diodes Research
- Photochemistry and Electron Transfer Studies
- Conducting polymers and applications
- Synthesis and Properties of Aromatic Compounds
- Molecular Junctions and Nanostructures
- X-ray Diffraction in Crystallography
- Covalent Organic Framework Applications
- Crystallization and Solubility Studies
- Photochromic and Fluorescence Chemistry
- Liquid Crystal Research Advancements
- Molecular Sensors and Ion Detection
- Metal-Organic Frameworks: Synthesis and Applications
- Oxidative Organic Chemistry Reactions
- Analytical Chemistry and Sensors
- Crystallography and molecular interactions
- Porphyrin and Phthalocyanine Chemistry
- Organic Chemistry Cycloaddition Reactions
- Synthesis and Biological Evaluation
- Advanced Chemical Physics Studies
- Radical Photochemical Reactions
- Conferences and Exhibitions Management
- Health and Medical Research Impacts
- COVID-19 and healthcare impacts
American University of Beirut
2016-2025
University of Windsor
2013
Yıldız Technical University
2012
Procter & Gamble (Switzerland)
2011
Instituto de Ciencia y Tecnología de Polímeros
2010
Lebanese American University
2009
University of Akron
2009
City University
2009
The Graduate Center, CUNY
2009
Georgia Institute of Technology
2003-2008
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 a variety organic solvents, and high charge-carrier mobilities along the stacking axis. An overview DLCs mobilities, theoretical modeling, alignment, device applications is addressed herein. The effects alignment on are discussed. Particular attention devoted to processing techniques that achieve...
Perspective covering carbazole-containing emitters and hosts for third generation TADF (thermally-activated delayed fluorescence) OLED technology along with computational benchmark studies.
A cross-sectional study was conducted investigating the association between exposure to financial, political, academic and social stressors, symptoms of depression, anxiety burnout among university students in Lebanon. Lebanon is a developing country experiencing financial crisis sociopolitical turmoil with poorly characterized impacts on mental health residents. To assess anxiety, condensed version Malach-Pines Burnout Measure Patient Health Questionnaire-4 (PHQ-4) were used, respectively....
A pyrene-based benzimidazole-linked polymer (BILP-10) has been synthesized by the co-condensation of 1,3,6,8-tetrakis(4-formylphenyl)pyrene and 1,2,4,5-benzenetetramine tetrahydrochloride in dimethylformamide. The use pyrene as a molecular building unit leads to formation self-assembled nanofibers that have moderate surface area (SABET = 787 m2 g−1) very high CO2/N2 (128) CO2/CH4 (18) selectivities at 273 K. Furthermore, results from gas uptake measurements indicate BILP-10 can store...
The high chemical and structural diversity of metal–organic frameworks (MOFs), which are porous crystalline materials, has attracted significant academic industrial interest. However, the poor processability MOF powders limits their full potential in practical applications. Toward this end, MOF-based composite materials increase framework robustness subsequent utility. Among these hybrid composites prepared on commercially available textile fibers offer flexibility needed for important...
Abstract Background Early exposure to medical research, specifically at the undergraduate level, contributes in building a solid education for students. In 2014, Medical Research Volunteer Program (MRVP) was established American University of Beirut (AUB). This program provides students with opportunity be involved ongoing research projects, on voluntary basis. Little is known about undergraduates’ outlook and challenges they face. The aim this study assess, among AUB students, perception,...
Tetrahydropyrene and pyrene have been functionalized in their 2,7-positions with carbazole 3,6-di-tert-butylcarbazole groups, the properties of these new compounds are compared to analogous derivatives benzene biphenyl using X-ray crystallography, UV-vis absorption fluorescence spectroscopy, electrochemistry, quantum-chemical calculations. The spectra similar those biphenyl-bridged analogues, although TD-DFT calculations indicate a different description excited states case, lowest observed...
Photocatalytic CO2 reduction into formate (HCOO-) has been widely studied with semiconductor and molecule-based systems, but it is rarely investigated covalent organic frameworks (COFs). Herein, we report a novel donor-acceptor COF named Co-PI-COF composed of isoindigo metallated porphyrin subunits that exhibits high catalytic efficiency (∼50 μmol g-1 h-1) at low-power visible-light irradiation in the absence rare metal cocatalysts. Density functional theory calculations experimental...
An isomeric mixture of a tris(pentafluorobenzyl ester) derivative hexaazatrinaphthylene forms stable amorphous films with an effective charge-carrier mobility 0.02 cm2/Vs, while the pure 2,8,15-isomer exhibits widely differing morphologies and carrier mobilities (0.001-0.07 cm2/Vs), depending critically on processing conditions.
Abstract Several hexaazatrinaphthylene derivatives and a tris(thieno)hexaazatriphenylene derivative have been synthesised by reaction of the appropriate diamines with hexaketocyclohexane. The crystal structure 2,3,8,9,14,15‐hexachloro‐5,6,11,12,17,18‐hexaazatrinaphthylene has determined X‐ray diffraction; this reveals molecular in good agreement that predicted density functional theory (DFT) calculations π‐stacking an average spacing between adjacent planes 3.18 Å. Solid‐state ionisation...
The nature of vibronic coupling in fused polycyclic benzene-thiophene structures has been studied using an approach that combines high-resolution gas-phase photoelectron spectroscopy measurements with first-principles quantum-mechanical calculations. results indicate general the electron-vibrational is stronger than hole-vibrational coupling. In acenedithiophenes, main contributions to arise from medium- and high-frequency vibrations. thienobisbenzothiophenes, however, interaction holes...
It is known that in photovoltaic applications, columnar discotic liquid crystal (LC) phases of conjugated compounds are useful to align the molecules for improving their charge mobilities. However, usually either crystalline or amorphous. For form LC phases, specific molecular design required ordered structural packing. In our recent report, a series compounds, 6,7,15,16-tetrakis(alkylthio)quinoxalino-[2′,3′:9,10]-phenanthro[4,5-abc]phenazine (TQPP-[SCn]4) (n = 6, 8, 10 and 12), which...
Quinoxalino[2′,3′:9,10]phenanthro[4,5-abc]phenazine (QPP) dyes have been studied as electron acceptor materials, fluorophores, and building blocks for self-organizing organic semiconductors. Condensation of tetraketopyrene with electron-rich diamino-terphenylene -triphenylene derivatives generates new donor–acceptor QPP that display columnar mesomorphism over wide ranges temperature; are fluorescent in solution, liquid crystal, solid phases; properties. Also reported the synthesis properties...
Stable, soluble ethynylated derivatives of pentacene (9a−c) were synthesized, and the ethynyl moieties on terminal rings used to tune electronic properties these compounds. Their oxidation potentials are higher their reduction lower than those pentacene. The HOMO−LUMO gaps among lowest reported for derivatives.
Nine 1,3,6,8-tetraarylpyrenes were prepared and characterized for OLED-based blue-light emission.
We report isomer-pure synthesis of thieno[2,3-f:5,4-f ']bis[1]benzothiophene and thieno[3,2-f:4,5-f ']bis[1]benzothiophene, the anti syn isomers a pentacyclic compound consisting alternating thiophene benzene rings. The optical electrochemical properties both are reported. In isomer, ribbonlike embedding three units leads to near-planar molecule with favorable π−π stacking behavior in solid state as shown by X-ray crystal structure analysis.
We report a first investigation of two new isomer-pure thieno[f,f′]bis[1]benzothiophenes, i.e.syn and anti with respect to the orientation thiophenes along long axis molecule, applied as organic semiconductors in field-effect transistors. The mobility both regioisomers is substantial reaches up 0.12 cm2 V−1 s−1, value that at most one order magnitude lower than best known transistors based on silicon dioxide gate insulators.
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 characterize the microstructure of TQPP-12 in films using combination polarized photon absorption spectroscopies (X-ray, vis, and infrared), X-ray diffraction, scanning probe techniques. This characterization strategy allowed determination molecular orientation packing style...
Most educational institutions lack a structured system that provides undergraduate students with research exposure in the medical field. The objective of this paper is to describe structure Medical Research Volunteer Program (MRVP) which was established at American University Beirut, Lebanon, as well assess success program.The MRVP program targets interested becoming involved field early on their academic career. It an active experience and opportunity learn from support physicians, clinical...
Abstract The development of n‐type organic semiconductors has evolved significantly slower in comparison to that p‐type mainly due the lack electron‐deficient building blocks with stability and processability. However, realize a variety optoelectronic devices, high‐performance polymer are essential. Herein, conjugated microporous polymers (CMPs) comprising isoindigo acceptor units linked benzene or pyrene donor ( BI PI ) showing semiconducting behavior reported. In addition, considering...
Although bis(diarylamino) mixed-valence radical cations have been quite extensively studied, their bis(carbazolyl) analogues not, even though the hole-transporting properties of species such as 4,4′-bis(9H-carbazol-9-yl)-1,1′-biphenyl, CBP, are widely exploited in organic light-emitting diodes. This work reports generation by chemical oxidation 4,4′-bis(3,6-di-tert-butyl-9H-carbazol-9-yl)-1,1′-biphenyl (a model for unstable cation CBP),...
Silicon-containing unsaturated polymers have been synthesized using the Pt(acac)2-catalyzed photoactivated hydrosilylation of alkynes. These fluoresce at 360 nm when excited 270 due to π-conjugated vinylphenyl segment in polymer chain. The excellent solubility several organic solvents.