Education
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Mar 1998–
Sep 2002The University of New South Wales
Chemistry · Ph.D.Australia · Sydney
Other
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LanguagesArabic and English
Publications (18) View all
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Article: Synthesis and Structural Chemistry of a Ternary Calix[4]arene Lattice Inclusion System
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ABSTRACT: AbstractA ternary calix[4]arene lattice inclusion system 3 has been synthesized, characterized and its crystal structure was determined by single crystal X-ray diffraction study. 3 is orthorhombic, space group Pbca with a=21.236(3) Å, b=12.2820(16) Å, c=25.795(3) Å, α=90°, β=90°, γ=90° and Z=4. Analyses of single crystals of arene 3 crystallized from DMSO revealed the existence of a ternary system of 3 with DMSO and H2O. Compound 3 exists in eclipsed form rather than the staggered form. Different types of host–host, host–guest and guest–guest interactions were observed and analysed. Graphical AbstractThe structural chemistry of a ternary calix[4]arene lattice inclusion system has been analysed and interesting supramolecular motifs were observed.Journal of Chemical Crystallography 05/2012; 40(3):191-194. · 0.57 Impact Factor -
Article: Effect of the acid-activated clays on the properties of porous clay heterostructures
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ABSTRACT: Porous clay heterostructures (PCHs) are quite a new class of solid acids, and exhibited pore sizes in the rarely observed supermicropore to small mesopore region. They are formed by the surfactant-directed assembly of mesostructured silica within the two dimensional galleries of smectite layered silicates. The acid activation of the smectite clay was an effective way to improve the acidity and the mesoporosity of the raw clay mineral. We have studied the effect of the type of clay minerals on the properties of porous acid-activated clay heterostructures (PACHs). Three different raw clays with different cation exchange capacities were selected and acid-activated at an acid/clay ratio of 0.2 (w/w). The synthesis of PACHs was achieved and characterized by powder x-ray diffraction, nitrogen adsorption-desorption and acidity using cyclohexylamine as probe molecule. A short order in the structure, as revealed by the powder x-ray diffraction of PACH materials was observed, with higher surface areas, pore volumes and acidity for some clays. These properties were not enhanced as we expected, and compared to the PCHs, indicating that the origin or type of clay affects the final properties of the derived materials. By using a soft extraction of the surfactants via chemical way, the stability and the properties of PCH and PACH materials were not improved except for one type of clay. KeywordsMontmorillonites–Acid-activated clays–Porous clay heterostructures–Mesoporous materials–AcidityJournal of Porous Materials 04/2012; 13(3):319-324. · 1.24 Impact Factor -
Article: Crystallographic Analyses of High-Z Value Structure of a Pyridinium–Carboxylate Complex
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ABSTRACT: AbstractEquimolar amounts of the proton acceptor 2-aminopyridine 1 and proton donor picolinic acid 2 were solvent-free grinded to give complex 5. X-ray diffraction was used to determine the crystal structure of the new complex 5 that found to be ionic, with proton transfer occurring to the aromatic nitrogen of the 2-aminopyridine moiety. Nonclassical hydrogen bonding exist in the solid state structure of 5, such as, 2-aminopyridine-carboxylic acid supramolecular heterosynthon was carefully investigated and compared to those exist in cocrystals in terms of supramolecular chemistry and crystal engineering. Complex 5 crystallizes in the monoclinic P2(1)/n space group with unit cell parameters of: a=8.7714(12) Å, b=12.1579(17) Å, c=10.8546(15) Å, with α=90°, β=110.100(4)°, γ=90°, and Z=4. Graphical Abstract Equimolar amounts of the proton acceptor 2-aminopyridine 1 and proton donor picolinic acid 2 were solvent-free grinded to give complex 5. X-ray diffraction was used to determine the crystal structure of the new complex 5 that found to be ionic, with proton transfer occurring to the aromatic nitrogen of the 2-aminopyridine moiety. Nonclassical hydrogen bonding exist in the solid state structure of 5, such as, 2-aminopyridine-carboxylic acid supramolecular heterosynthon was carefully investigated and compared to those exist in cocrystals in terms of supramolecular chemistry and crystal engineering. KeywordsNonclassical hydrogen bonding–Proton-transfer complex–Supramolecular interactions–Solvent-free and ethyl acetate drop grinding–High-Z value structureJournal of Chemical Crystallography 04/2012; 41(5):708-714. · 0.57 Impact Factor -
Article: Synthesis and X-Ray Crystallographic Analyses of a Ternary Inclusion Complex of Racemic V-Shaped Diheteroaromatic Host with Formic Acid and Water
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ABSTRACT: AbstractA V-shape diquinoline was synthesized so that it used nitro groups as alternative sensor groups to the halogens employed previously. The solid-state structure of its inclusion compound with formic acid was carefully investigated in term of crystal engineering and supramolecular chemistry. A ternary inclusion complex was obtained and its supramolecular interactions were carefully investigated and presented. The suitable X-ray crystals were obtained by crystallization of the host diquinoline from formic acid. The structure adopted acid⋯pyridine hydrogen-bonded cocrystal in addition to other non-covalent interactions. No proton-transfer process was detected; no salt formation. Graphical AbstractA V-shape diquinoline was synthesized so that it used nitro groups as alternative sensor groups to the halogens employed previously. The solid-state structure of its inclusion compound with formic acid was carefully investigated in term of crystal engineering and supramolecular chemistry. A ternary inclusion complex was obtained and its supramolecular interactions were carefully investigated and presented. The suitable X-ray crystals were obtained by crystallization of the host diquinoline from formic acid (Figure 1). KeywordsCrystal engineering–Intermolecular forces–Supramolecular synthons–Ternary inclusion complex–X-ray crystal structureJournal of Chemical Crystallography 04/2012; 41(4):570-576. · 0.57 Impact Factor -
Article: Enhanced Guest Inclusion by a Sulfur-Containing Diquinoline Host
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ABSTRACT: The sulfur-bridged compound 7α,15α-dibromo-6,7,14,15-tetrahydro-6α,14α-thiacycloocta[1,2-b:5,6-b′]diquinoline (10) yields an apohost crystal form plus a series of six lattice inclusion compounds. The diverse range of their X-ray crystal forms is described, and the structures are compared in crystal engineering terms. Compound 10 exhibits none of the anomalous properties shown earlier by its oxygen-bridged and nor-bromo cousins. Further, it demonstrates inclusion capabilities considerably superior to its methano-bridged analogue. Although the sulfur atom does not appear to be actively driving inclusion host behavior, closer analysis reveals that it is always involved. Multiple sulfur interactions are present in all these clathrate structures, most commonly involving bifurcated H···S···H motifs.09/2011;
