Nathir Al-Rawashdeh

Jordan University of Science and Technology | Just · Department of Chemistry

For accurate patient identification and treatment, early-stage disease diagnosis is particularly important. However, a lack of patient compliance with the current diagnostic techniques prevents prompt diagnosis, making the creation of noninvasive diagnostic tools essential. Breath analysis, one of the most promising noninvasive diagnostic technique...

As the industry of olive oil continues to grow, the management of olive mill wastewater (OMW) by-products has become an area of great interest. While many strategies for processing OMW have been established, more studies are still required to find an effective adsorbent for total phenolic content uptake. Here, we present a composite of a Cu 1,4-ben...

A combined coagulation-flocculation/adsorption approach has been developed to remove organic and phenolic compounds from Olive mill wastewater (OMW). The effect of utilizing coagulation-flocculation on the removal of total suspended solids (TSS) prior to volcanic tuff (VT) /magnetite nanoparticles (MNPs) adsorption was investigated. On the other ha...

The development of green chemistry that minimize environmental impact is currently one of the major challenges in green synthesis of nanoparticles. In this study pristine pomegranate peel extract (PPP) was used for green synthesis of titanium dioxide nanoparticles (TiO2 NPs) and formation of a nanocomposite (PPP-TiO2). The synthesized nanocomposite...

Olive mill wastewater (OMW) represents a significant environmental problem in the Mediterranean region. It has extremely high concentrations of phenolic compounds, which creates an unpleasant odor and phytotoxic impact. In this study, we evaluated a developed cost effective and eco-friendly media of granular activated carbons impregnated with surfa...

Several Zinc Oxide (ZnO) photo-anodes were prepared with different morphologies. For each morphology, two composites containing graphene oxide (GO) were prepared. ZnO sheet-flowers attained the highest efficiency among control samples, owing to the light diffraction that may be caused by such morphology. On the other hand, ZnO rods achieved lower p...

Six new Schiff bases, namely, ((E)-(Phenylimino)methyl)phenol (1), 2-((E)-(p-Tolylimino)methyl)phenol (2), (E)-2-(Hydroxybenzylideneamino)benzoic acid (3), (E)-2-(Hydroxybenzylideneamino)benzoic acid (4), 2-((E)-(2 Hydroxyphenylimino)methyl) phenol (5), and 2-((E)-(2 Mercaptophenylimino)methyl)phenol (6) were synthesized and fully characterized. Th...

In this study the use of surfactant enhanced aquifer remediation (SEAR) technology for separating phenolic compounds from olive mill wastewater (OMW) by using modified surfactant were evaluated. New proposed modified surfactant, sodium polypropylene oxides sulfate (L167–4S), combined with cationic hydrotropes tetra butyl ammonium bromide (TBAB) in...

(E)-3-(9-Anthryl)acrylates and (E)-9-aroylethenylanthracenes have been prepared by solventless Wittig olefination with conjugated phosphoranes. The (E)-3-(9-anthryl)acrylates were brominated to give (E)-3[10-{9-bromoanthryl}]acrylates, which could be subjected to Suzuki reactions with arylboronic acids to produce (E)-3-[10-{9-arylanthryl}]acrylates...

The inhibition effect of lignin sulfonate against corrosion for mild steel in acidic solution has been examined by means of FTIR (fourier transform infrared spectroscopy), FAA (flame atomic absorption) spectroscopy, SEM (scanning electron microscope), EDS (energy dispersive X-ray spectroscopy), and mass loss techniques. The results revealed that li...

(E)-3-(Anthran-9-yl)acrylates and (E)-9-aroylethenylanthracenes have been prepared by solventless Wittig olefination with conjugated phosphoranes. The (E)-3-(Anthran-9- yl)acrylates were brominated to give (E)-3[9-bromoanthran-10-yl]acrylates, which could be subjected to Suzuki reactions with arylboronic acids to produce (E)-3-[9-arylanthran-10- yl...

The photochemistry of the vinyl substituted (E)-3-(anthran-9-yl)propenoates and (E)-9- (aroylethenyl)anthracenes as well of their reduced derivatives has been studied at λ = 254 nm and at λ = 352 nm. At λ = 254 nm and λ = 352 nm, the 9-vinyl substituted anthracenes undergo E/Z-isomerization, while their reduced derivatives undergo [4+4]-dimerisatio...

In the present study uranyl selective electrodes in polyvinyl chloride (PVC) matrix membrane were prepared based on a complex of uranyl ion (UO2) with carboxybenzotriazole (CBT) as ligand. The effect of the nature of plasticizer in PVC matrix were evaluated using three different plasticizers, these are dibutyl phthalate (DBP), dioctyl phthalate (DO...

The adsorption of Pb(II) ions on chemically activated carbon derived from palm tree leaves was investigated. The activated carbon (AC) was characterized by Infrared absorption spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) method and Scanning Electron Microscopic (SEM) analysis. The surface area (SBET), pore volume, and pore diameter of AC were...

A series of lanthanide complexes with the general formulae [Ln(dmpc)(NO3)2(H2O)2]NO3 (Ln¼Pr, Nd, Sm, Eu,Gd,Tb,Dy,andEr)and[La(dmpc)(NO3)2(H2O)2]NO3 were prepared by direct reaction between hydrated lanthanide(III) nitrate and dimethylpyridine-2,6-dicarboxylate (dmpc) in a 1:1 M ratio in ethylacetate– chloroform mixture. The luminescence properties...

The adsorption of three different dyes on similarly derived carbon materials from date palm leaves was studied. The adsorption kinetics and equilibrium data were investigated based on dyes adsorption tests. The break-through time was noted with a UV-VIS spectrometer to determine the maximum capacity of the date-palm leaf derived carbon material. Th...

The inhibition effect of sinapis alba (SA) extract on the corrosion of aluminum in 1.0M sodium hydroxide (NaOH) was investigated using weight-loss measurements, and electrochemical polarization methods; also, surface morphology was analyzed by scanning electron microscopy (SEM) technique. The results show that sinapis alba extract is a good inhibit...

Self-assembled monolayers (SAMs) formed by adsorption of 1,2-dibenzyldiselenide (DPMSe) and 1,2-diphenyldiselenide (DBSe) on Au(111) substrates at room temperature have been characterized using scanning tunnelling microscopy, X-ray photoelectron spectroscopy, infrared reflection absorption spectroscopy, near-edge X-ray absorption fine structure spe...

Ruthenium(II) diimine complexes with the π-acidic bidentate 1,2-bis(phenylthio)ethane (dpte) ligand exhibit surprising luminescence in room-temperature fluid solution. Variations in the MLCT energies and Ru(III/II) redox couple can be understood in terms of the influence of the donor properties of the ligands on the mainly metal-based HOMO and main...

In the title mol­ecule, C18H13BrO2, the anthracene unit forms an angle of 46.91 (2)° with the mean plane of the methyl acrylate moiety. In the crystal, the mol­ecules arrange themselves into strands parallel to [010] and, due to the crystal symmetry, there are eight strands crossing the unit cell. In each strand, mol­ecules form short C—H⋯O and C—H...

In the asymmetric unit of the title compound, C19H16O2, there are two symmetry-independent mol­ecules (A and B) that differ in the conformation of the ester eth­oxy group. In the crystal, the mol­ecules form inversion dimers via pairs of C—H⋯O inter­actions. Within the dimers, the anthracenyl units have inter­planar distances of 0.528 (2) and 0.479...

The inclusion complexes of selected sunscreen agents, namely, oxybenzone (Oxy), octocrylene (Oct), and ethylhexyl-methoxycinnamate (Cin) with β-cyclodextrin (β-CD) were studied by UV-Vis spectroscopy, differential scanning calorimetry (DSC), 13C NMR techniques, and molecular mechanics (MM) calculations and modeling. Molecular modeling (MM) study of...

The inhibition effect of exudate gum from Acacia trees (Gum Acacia, GA) on the corrosion of mild steel in acidic media was studied by weight loss, hydrogen evolution, and electrochemical polarization methods; also, surface morphology was analyzed by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoe...

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In this study, improved detection of bovine serum albumin (BSA) was achieved by use of a fabricated surface plasmon resonance (SPR) biosensor. Terphenyldithiol (TPDT) was self-assembled on a gold substrate, then gold nanoparticles (Au-NPs) were chemisorbed on to the TPDT monolayer by strong bonding with the terminal thiol groups of the TPDT. The ne...

In this study, improved detection of bovine serum albumin (BSA) was achieved by use of a fabricated surface plasmon resonance (SPR) biosensor. Terphenyldithiol (TPDT) was self-assembled on a gold substrate, then gold nanoparticles (Au-NPs) were chemisorbed on to the TPDT monolayer by strong bonding with the terminal thiol groups of the TPDT. The ne...

Series of (YBa2Cu3O7−δ )1−x (Al2O3)x samples have been prepared using solid state reaction method. Various amount of nano-sized Al2O3 particles (∼50 nm) were added with (x=0, 0.005, 0.01, 0.02, and 0.05). The microstructure and the morphology of the polycrystalline samples have been characterized by X-ray diffraction (XRD) and atomic force microsco...

The effect of β-cyclodextrin on the catalytic stability and reactivity of methylrhenium trioxide (MTO), CH3ReO3, which has been used for activation of hydrogen peroxide toward oxidation and epoxidation reactions, was studied using UV–Vis spectrophotometery. The stability and reactivity of the new catalytic system (MTO/β-CD) to activate H2O2 toward...

To investigate the effect of hydroxypropyl-beta-cyclodextrin (HP-beta-CD) concentration on the physicochemical properties of the sunscreen agents, namely oxybenzone (Oxy), octocrylene (Oct), and ethylhexyl-methoxy-cinnamate (Cin), in aqueous solution and cream formulations. The inclusion complexes of sunscreen agents with hydroxypropyl-beta-cyclode...

Series of (YBa 2 Cu 3 O 7−δ) 1−x (Al 2 O 3) x samples have been prepared using solid state reaction method. Various amount of nano-sized Al 2 O 3 particles (∼50 nm) were added with (x = 0, 0.005, 0.01, 0.02, and 0.05). The microstructure and the morphology of the polycrys-talline samples have been characterized by X-ray diffraction (XRD) and atomic...

Objective: To investigate the effect of hydroxypropyl-β-cyclodextrin (HP-β-CD) concentration on the physicochemical properties of the sunscreen agents, namely oxybenzone (Oxy), octocrylene (Oct), and ethyl-hexyl-methoxy-cinnamate (Cin), in aqueous solution and cream formulations. Methods: The inclusion complexes of sunscreen agents with hydroxyprop...

The electrochemical behavior of copper in 0.05 M HCl and 0.05 M NaCl carried out at open-circuit potential and at constant anodic potential after one hour has been investigated using electrochemical impedance spectroscopy (EIS) at 20 °C, 40 °C and 60 °C. The formation of copper chloride (CuCl) film does not protect copper from dissolution in the ch...

In this paper, the influence of inclusion complexation with β-cyclodextrin (β-CD) on the photostability of antazoline, xylometazoline, and naphazoline in aqueous media was investigated. The photodegradation reaction of these drugs molecules was explored using UV–vis spectrophotometery-based kinetic analysis and high performance liquid chromatograph...

Self-assembeld monolayers (SAMs) formed by the adsorption of 4′-nitro-1,1′-biphenyl-4-thiol (NBT) on gold substrates were studied using infrared reflection-absorption spectroscopy (IRRAS). The IRRAS results revealed that the straightforward approach for the fabrication of SAMs, namely, immersions of the gold film in organothiol solutions, leads to...

Superconducting thick films of Bi1.8Pb0.4Sr2Ca2.2Cu3Ox (BPSCCO) have been prepared on MgO single crystal substrates by employing a screen-printing method. Using this technique, we have prepared several samples utilizing different experimental conditions. Optimization of properties such as film thickness, microstructure, phase formation and annealin...

The electrochemical reduction processes of a new series of asymmetrical trityl di- (TrSSR) and trisulfides (TrSSSR) were studied using cyclic voltammetry on bare and coated gold electrodes. On a coated gold electrode surface, adsorption phenomena are absent; the electrochemical reduction process is irreversible and found to be diffusion controlled....

The inclusion complexes of selected imidazoline-derived drugs, namely Antazoline (AN), Naphazoline (NP) and Xylometazoline (XM) with β-cyclodextrin (β-CD) were investigated using steady-state fluorescence spectroscopy, differential scanning calorimetry (DSC), and molecular mechanics (MM) calculations and modeling. The modified form of the Benesi-Hi...

The photostability of ciprofloxacin in the presence and absence of α-, β-, γ-cyclodextrins (CDs) has been investigated in aqueous solutions by UV-visible spectroscopy. The results show that a linear relationship between irradiation time and the absorbance of the drug after irradiation proved that the degradation reaction is first-order. In addition...

A direct electrochemical (cyclic voltammetry) analysis of a new series of unsymmetrical trityl di- and trisulfides were performed inN,N-dimethylformamide (DMF). The tritylmoiety cleaves first during the reduction of all compounds. In all trisulfides, the formation of tritylalcohol, diatomic sulfur, and the analogue thiol were observed. The experime...

The inhibiting effect of the cationic surfactant cetyl trimethylammonium chloride (CTAC) on the corrosion of aluminium in hydrochloric acid solutions in the presence and absence of external magnetic fields of up to 0·114 T has been investigated by weight loss measurements. It was found that strong magnetic fields affect the corrosion rate. The effi...

The potential increase in fluorescence of a benzimidazole-type fungicide (carbendazim) due to complexation with cucurbit[6]uril is reported. The fluorescence of the probe carbendazim in aqueous Na2SO4 solution (pH=7.61) at room temperature is found to increase by a maximum factor of ∼10.0 and blue-shifted up to ∼11±1 nm with the increase in cucurbi...

Purpose To investigate the inhibiting effect of the cationic surfactant cetyl trimethylammonium chloride (CTAC) on aluminum (Al). Design/methodology/approach Pure aluminum rods were immersed in hydrochloric acid (HCl) and sodium hydroxide (NaOH) solutions for weight‐loss tests and potentiostatic polarization measurements. Findings The inhibition...

The inclusion of the anti-inflammatory drug, Nabumetone (NAB), in γ-cyclodextrin (γ-CD) was studied by fluorescence measurements. The emission fluorescence spectrum, of NAB reveals a maximum whose intensity increases with the different γ-CD’s growing concentrations. The stoichiometery (1:1) and binding constants of the complexes at 15, 25, 35, and...

Inhibition of the corrosion of aluminum (Al) in hydrochloric acid (HCl) by sulfonic acid (SA), sodium cumene sulfonate (SCS), and sodium alkyl sulfate (SAS) has been studied using weight-loss and potentiostatic polarization methods. The results drawn from the two techniques are comparable and exhibit small discrepancy. The inhibition action depends...

The complexation of sparfloxacin (SPR) and norfloxacin (NOR) by β-cyclodextrin (β-CD) in water and in mixed organic/aqueous media has been studied by absorption spectroscopy. Three organic solvents [dimethyl-sulphoxide, ethanol and 2-methyl-1-propanol have been adopted which differ in polarity and hydrophobicity. It has been shown that the presence...

Various complexes Hg(PQ)X2 (PQ = 2-(2`-pyridyl)quinoline, X = Cl−, Br−, I−, N3 −, NO2 −, NO3 −, and SCN−) have been synthesized by direct reaction of HgX2 (X = Cl−, Br−, and I−) with PQ or by the reaction of HgCl2 with either NaN3, NaNO2, NaNO3, or NaSCN followed by the addition of 2-(2`-pyridyl)quinoline solution to the reaction mixture. The new c...

The complexation reaction of trans-[RuCl2(Dpte)2] (Dpte – (diphenylthio)ethane) with mixed diimine ligands 2,2"-bipyridine, pyridylquinoline, 4,6-dichloro-2-(2-pyridyl)pyrimidine, 4,6-dichloro-5-methyl-2-(2-pyridyl)pyrimidine, and 4,6-dichloro-5-phenyl-2-(2-pyridyl)pyrimidine produces new Ru(II) mixed-ligand complexes. These complexes exhibit maxim...

Analysis of Palladium Complexes Containing Nitrogen Heterocyclic Ligands by Electrospray Ionization and Ion Trap Mass Spectrometry

Luminescence quenching of mixed-ligand… Abstract The effect of ionic strength and acidity (pH) on the luminescence quenching of the excited states of a number of mixed-ligand Ru(II) complexes have been studied. The mixed-ligand Ru(II) complexes of diphenyl-thioethylene (dpte); 2, -bipyridine (bpy), 2-(2-pyridyl)-quinoline (pyq); 4,6-dichloro-2-(2-p...

The ion formation characteristics of seven palladium complexes and coordination compounds were analyzed using electrospray ionization (ESI) and ion trap mass spectrometry (ITMS). It was observed that ligands having a single negative charge could undergo interchange with a mobile phase solvent molecule. It was found that lithiated molecule ions coul...

New molybdenum and tungsten complexes containing tert-butylcyclopentadienyl ligand (Cp'= tBu-C5H4) have been prepared and characterized. The reaction of M(CO)3(CH3CN)3 with tert-butylcyclopentadiene provide improved route to the metal-metal bond compounds [Cp'M(CO)3]2 (M= Mo (Ia), W (Ib)) in good isolated yields. New examples of mononuclear complex...

We have obtained visible range polarization spectra of template-synthesized gold nanoparticles oriented in polyethylene (PE). The plasmon resonance extinction bands observed with the incident electric field polarized parallel, perpendicular, and at intermediate angles to the direction of friction orientation are consistent with the long axis of the...

We have prepared nanoscopic gold rods of various radii and aspect ratios via anodic aluminum oxide - based template synthesis, and incorporated these particles into polyethylene films. The resulting composite films exhibit linear dichroic properties which result from a net orientation of the rods. The plasmon resonance absorption maxima occur at th...

We have succeeded in preparing gold rods of high aspect ratio (>6) and diameter ca. ≈32 nm, using anodically grown alumina films as host templates. To evaluate the sample quality, the plasmon resonance spectra of alumina/gold nanoparticle composite films were measured. In general, we found that the plasmon resonance maxima and intensity are depe...

The photogalvanic and photophysical behavior of a number of mixed-ligand ruthenium(II) complexes of 2,2â²-bipyridine (bpy), 3,3â²-bipyradzine (bpd), 2-(2â²-pyridyl)quinoline (pyrq), 4,4â²-dimethyl-2,2â²-bipyridine (dmbpy), and 2,3-bis(2â²-pyridyl)pyrazine (dpp) is reported both in water and in sodium lauryl sulfate (SDS) solutions. The effect of SD...

A number of RuII-diimine complexes were used to photosensitize methyl viologen cation radical (MV+) production in the presence of ethylenediaminetetraacetic acid (EDTA). An unusually high quantum yield (π(MV+) = 1.88) was obtained for [Ru(bpz)2dpq]2+ (bpz = 2′,2-bipyrazine; dpq = 2,3-di-(2′-pyridyl)-quinoxaline) at pH 11. This value is higher than...

The plasmon resonance spectra of nanoscopic silver particles adsorbed on transparent semiconductor electrodes in contact with eight aqueous electrolytes (KCl, KBr, KI, NaCl, NaBr, NaI, NaClO 4 , and KPF 6) have been examined. In all electrolytes, the plasmon resonance bands are red-shifted and decreased in intensity as the applied potential is made...