King Abduaziz University

Jeddah, Saudi Arabia

King Abduaziz University

Jeddah, Saudi Arabia
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Asiri A.M.,King Abdulaziz University | Asiri A.M.,King Abduaziz University | Khan S.A.,King Abduaziz University | Tahir M.N.,University of Sargodha
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 16H 13ClN 2S, the dihedral angle between the 4-chlorobenzaldehyde moiety and the heterocyclic fivemembered ring is 7.21 (17)°. In the crystal, molecules are linked by weak C - H⋯π interactions, generating [100] chains.


Asiri A.M.,King Abduaziz University | Khan S.A.,King Abduaziz University | Tahir M.N.,University of Sargodha
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 13H 12N 2O 3, the dihedral angle between the aromatic rings is 7.94 (12)°. In the crystal, inversion dimers linked by pairs of C - H⋯O hydrogen bonds generate R 2 2(6) loops. Weak π-π [centroidcentroid separations = 3.7480 (13) and 3.9047 (13) Å] and C - H⋯π interactions help to consolidate the packing.


Asiri A.M.,King Abdulaziz University | Asiri A.M.,King Abduaziz University | Khan S.A.,King Abduaziz University | Tahir M.N.,University of Sargodha
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 16H 13ClN 2S, the mean planes fitted through all non-H atoms of the heterocyclic fivemembered and the benzene rings are oriented at a dihedral angle of 5.19 (7)°. In the crystal, a weak C - H⋯π interaction occurs, along with weak π-π interactions [cenroidcentroid distance = 3.7698 (11) Å].


Asiri A.M.,King AbduAziz University | Al-Amoudi M.S.,Taif University | Al-Talhi T.A.,Taif University | Al-Talhi A.D.,Taif University
Journal of Saudi Chemical Society | Year: 2011

Titanium dioxide nanoparticles are used in various applications, including environmental photocatalysis, solar cells and memory devices. In this study, we present the photodegradation of Rhodamine 6G and phenol red, employing heterogeneous photocatalytic process under solar irradiation. The experiments were carried out to study the effects of various parameters (i.e. the effect of the anchoring groups on the catalyst, concentration of the n-TiO2 semiconductor). The n-TiO2 was synthesized by a sol-gel process and characterized by SEM. When samples of n-TiO2 of different sizes were encapsulated with eriochromycine dye the quantum size effect is observed in the visible region of the spectrum. The rate of degradation was estimated from the residual concentration spectrophotometrically. Phenol red showed higher degradation than Rhodamine 6G which can be attributed to its sulfonic and hydroxyl anchoring groups. The photodegradation showed pseudo-first-order kinetics. © 2010.


Beall G.W.,Texas State University | Beall G.W.,King Abduaziz University | Duraia E.-S.M.,Texas State University | Duraia E.-S.M.,Suez Canal University | And 2 more authors.
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2014

Production of graphene by thermal annealing on copper foil substrates has been studied with different sources of carbon. The three carbon sources include humic acid derived from leonardite, graphenol, and activated charcoal. Hexagonal single crystalline graphene has been synthesized over the copper foil substrates by thermal annealing of humic acid, derived from leonardite, in argon and hydrogen atmosphere (Ar/H2=20). The annealing temperature was varied between 1050 C and 1100 C at atmospheric pressure. Samples have been investigated using scanning electron microscope (SEM) and Raman spectroscopy. At lower temperatures the thermal annealing of the three carbon sources used in this study produces pristine graphene nanosheets which cover almost the whole substrate. However when the annealing temperature has been increased up to 1100 C, hexagonal single crystalline graphene have been observed only in the case of the humic acid. Raman analysis showed the existence of 2D band around 2690 cm-1.


Asiri A.M.,King Abdulaziz University | Asiri A.M.,King Abduaziz University | Khan S.A.,King Abduaziz University | Tahir M.N.,University of Sargodha
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

The title compound, C 17H 14N 2O 2S, crystallizes with two roughly planar molecules in the asymmetric unit, in which the dihedral angles between the 1,3-benzodioxole-5-carbaldehyde moiety and the heterocyclic five-membered ring are 3.76 (5) and 5.33 (12)°. In each mol-ecule, a short C - H⋯S contact generates an S(5) ring. In the crystal, pairs of molecules are linked by a weak C - H⋯N inter-action, forming dimers.


Asiri A.M.,King Abduaziz University | Khan S.A.,King Abduaziz University | Tahir M.N.,University of Sargodha
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 26H 21N 3O, the phenyl ring of the 4-amino-anti-pyrine group and the heterocyclic five-membered ring along with its substituents, except for the N-bound methyl group (r.m.s. deviation = 0.0027 Å), form a dihedral angle of 54.20 (5)°. Two S(6) ring motifs are formed due to intra-molecular C - H⋯N and C - H⋯O hydrogen bonds. In the crystal, molecules are linked into supra-molecular chains along the a-axis direction via C - H⋯O contacts.


Alshaery A.A.,King AbduAziz University
Life Science Journal | Year: 2012

In this paper, an iterative method of arbitrary order of convergence (p ≥ 2) is developed for solving the universal Lambert's problem using homotopy continuation technique. The method does not need any priori knowledge of the initial guess, a property which avoids the critical situation between divergent to very slow convergent solution, that may exist in the application of other numerical methods depending on initial guess. Computational algorithms and numerical applications will b e applied for some orbits.

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