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Search Results: 1 - 10 of 551178 matches for " A.O AL-YOUBI "
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ELECTROCHEMICAL INVESTIGATION OF CYSTEAMINE AT CARBON FIBER MICRODISK ELECTRODE
IS EL-HALLAG,A.O AL-YOUBI,A.Y OBAID,E.H EL-MOSSALAMY
Journal of the Chilean Chemical Society , 2011,
Abstract: The electrooxidation of cysteamine compound was carried out using convolutive cyclic voltammetry, linear sweep voltammetry and chronoamperomtry techniques at a carbon fiber microdisk electrode in 0. 1 M perchloric acid. The electrooxidation potential (E0'' ) of cysteamine occurs at + 0.921 V. The mechanistic pathway of electrooxidation process at carbon fiber microelectrode is loss of 1 electron per molecule. The electrode process is controlled mainly by diffusion. The chemical and electrochemical parameters of the investigated system were determined experimentally and verified theoretically via digital simulation method.
ELECTROCHEMICAL INVESTIGATION OF CYSTEAMINE AT CARBON FIBER MICRODISK ELECTRODE
EL-HALLAG,IS; AL-YOUBI,A.O; OBAID,A.Y; EL-MOSSALAMY,E.H; EL-DALY,S.A; ASIRI,A.M;
Journal of the Chilean Chemical Society , 2011, DOI: 10.4067/S0717-97072011000400003
Abstract: the electrooxidation of cysteamine compound was carried out using convolutive cyclic voltammetry, linear sweep voltammetry and chronoamperomtry techniques at a carbon fiber microdisk electrode in 0. 1 m perchloric acid. the electrooxidation potential (e0'' ) of cysteamine occurs at + 0.921 v. the mechanistic pathway of electrooxidation process at carbon fiber microelectrode is loss of 1 electron per molecule. the electrode process is controlled mainly by diffusion. the chemical and electrochemical parameters of the investigated system were determined experimentally and verified theoretically via digital simulation method.
(E)-2-Methyl-5-(thiophen-2-ylmethylidene)cyclopentan-1-one
Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Hassan M. Faidallah,Khalid A. Alamry
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811033708
Abstract: The exocyclic C=C double-bond in the title compound, C11H12OS, has an E configuration. The methyl-bearing C atom in the cyclopentane ring is disordered over two positions with a site-occupation factor of 0.899 (8) for the major occupied site.
4-(5,3′-Dimethyl-5′-oxo-2-phenyl-2′,5′-dihydro-2H-[3,4′]bipyrazol-1′-yl)benzenesulfonamide monohydrate
Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Hassan M. Faidallah,Khalid A. Alamry
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811034453
Abstract: In the title compound, C20H19N5O3S·H2O, the pyrazole ring is connected to a pyrazolone ring, and the two five-membered rings are aligned at 45.0 (1)°. The pyrazole ring is connected to a phenyl ring and the two are twisted by 42.7 (1)°. Finally, the pyrazolone ring is connected to a benzene ring and the two are twisted by 19.5 (1)°. The N—H and –NH2 portions and the solvent water molecules are engaged in N—H...N, N—H...O and O—H...O hydrogen-bonding interactions to generate a three-dimensional network.
4-(3-Methyl-5-phenyl-1H-pyrazol-1-yl)benzenesulfonamide
Abdullah M. Asiri,Hassan M. Faidallah,Abdulrahman O. Al-Youbi,Salem A. Basaif
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811032855
Abstract: With respect to the planar five-membered ring of the title compound, C16H15N3O2S, the phenyl ring is aligned at 47.0 (1)° and the phenylene ring at 37.6 (1)°. The amino group has the N atom in a pyramidal geometry; the group is a hydrogen-bond donor to the sulfonyl O atom of one molecule and to the pyrazole N atom of another molecule, resulting in the formation of a layer parallel to the bc plane.
2-Oxo-4-(thiophen-2-yl)-1,2,5,6-tetrahydrobenzo[h]quinoline-3-carbonitrile
Abdullah M. Asiri,Hassan M. Faidallah,Abdulrahman O. Al-Youbi,Khalid A. Alamry
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811033915
Abstract: In the molecule of the title compound, C18H12N2OS, the tetrahydrobenzo[h]quinoline fused-ring system is buckled owing to the ethylene –CH2CH2– fragment, the benzene ring and the pyridine ring being twisted by 16.0 (1)°. The 4-substituted aromatic ring is bent away from the pyridine ring by 59.5 (2)° (for the major disordered thienyl component) in order to avoid crowding the cyanide substituent. In the crystal, two molecules are linked by a pair of N—H...O hydrogen bonds to form a centrosymmetric dimer. The thienyl ring is disordered over two sites in a 72.7 (2):27.3 ratio.
Ethyl (2E)-2-cyano-3-(1-methyl-1H-pyrrol-2-yl)prop-2-enoate
Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Khalid A. Alamry,Hassan M. Faidallah
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811031941
Abstract: The 15 non-H atoms of the title compound, C11H12N2O2, are approximately coplanar, the r.m.s. deviation being 0.145 . The major deviation from coplanarity is seen in a twist between the ethene (E configuration) and pyrrole rings [C—C—N—C torsion angle = 8.26 (18)°]. The carbonyl O and cyano N atoms are syn to each other. In the crystal, supramolecular linear tapes linked by C—H...O and C—H...N interactions are further connected by C—H...π(pyrrole) interactions.
4-(1,3-Benzodioxol-5-yl)-2-oxo-1,2,5,6-tetrahydrobenzo[h]quinoline-3-carbonitrile
Abdullah M. Asiri,Hassan M. Faidallah,Abdulrahman O. Al-Youbi,Khalid A. Alamry
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811033903
Abstract: In the molecule of the title compound, C21H14N2O3, the tetrahydrobenzo[h]quinoline fused-ring system is buckled owing to the ethylene –CH2CH2– fragment, the benzene ring and the pyridine ring being twisted by 24.3 (1)°. The ring of the benzodioxol system is bent away from the pyridine ring by 61.4 (1)° in order to avoid crowding the cyanide substituent. Two molecules are linked by a pair of N—H...O hydrogen bonds to form a centrosymmetric dimer.
4-(4-Methoxyphenyl)-2-oxo-1,2,5,6-tetrahydrobenzo[h]quinoline-3-carbonitrile
Abdullah M. Asiri,Hassan M. Faidallah,Abdulrahman O. Al-Youbi,Khalid A. Alamry
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811033897
Abstract: In the molecule of the title compound, C21H16N2O2, the tetrahydrobenzo[h]quinoline fused-ring system is buckled owing to the ethylene –CH2CH2– fragment, the benzene ring and the pyridine ring being twisted by 19.7 (1)°. The 4-substituted aromatic ring is bent away from the pyridine ring by 50.3 (1)° in order to avoid crowding the cyanide substituent. In the crystal, two molecules are linked by a pair of N—H...O hydrogen bonds to form a centrosymmetric dimer.
(E)-1-(Naphthalen-1-yl)-3-(1-phenyl-1H-pyrazol-4-yl)prop-2-en-1-one
Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Hassan M. Faidallah,Khalid A. Alamry
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811035124
Abstract: In the title molecule, C22H16N2O, the phenyl ring is twisted slightly with respect to the plane of the central pyrazole ring [dihedral angle = 14.8 (2)°]; the central ring is connected to the naphthyl ring through a —CH=CH—C(=O)— fragment, whose C=C double bond has an E configuration. The pyrazole ring and naphthalene ring system are twisted by 46.3 (1)°. Weak intermolecular C—H...O hydrogen bonds link the molecules, forming supramolecular chains running along the a axis. The crystal studied was a non-merohedral twin with a component ratio of 0.544 (2):0.456 (2).
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