Data Grid supports data-intensive applications in a large scale grid environment. It makes use of storage systems as distributed data stores by replicating contents. On the co-allocation architecture, the client can divide a file into k... more
Data Grid supports data-intensive applications in a large scale grid environment. It makes use of storage systems as distributed data stores by replicating contents. On the co-allocation architecture, the client can divide a file into k blocks of equal size and download the blocks dynamically from multiple servers by GridFTP in parallel. But the drawback is that faster servers must wait for the slowest server to deliver the final block. Therefore, designing efficient strategies for accessing a file from multiple copies is very import. In this paper, we ...
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Research Interests: Engineering, Materials Engineering, Inorganic Chemistry, Organic Chemistry, Supramolecular Chemistry, and 18 moreX Rays, Mathematical Sciences, Physical sciences, Organometallics, High performance polymers, Hazardous Materials, Macromolecules, Hydrogen Bond, CHEMICAL SCIENCES, Transition metal chemistry, Molecular Conformation, Inorganic Biochemistry, Organometallic Compounds, Salicylic Acid, Edetic Acid, Chromium Compounds, Molecular Structure, and Chlorides
A new zinc phosphite exhibited remarkable structural transformations upon heat stimulation to convert into a dehydrated form (NCU-2a) and a new structure, NCU-2b. The gas adsorption properties of the materials as well as the luminescence... more
A new zinc phosphite exhibited remarkable structural transformations upon heat stimulation to convert into a dehydrated form (NCU-2a) and a new structure, NCU-2b. The gas adsorption properties of the materials as well as the luminescence properties of LED devices fabricated using these materials were also investigated.
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A mixed-metal uranyl aquofluoride, [(UO2)2F8(H2O)2Zn2(4,4'-bpy)2].(4,4'-bpy), has been synthesized under hydrothermal conditions and has been structurally characterized by single-crystal X-ray diffraction, infrared spectroscopy,... more
A mixed-metal uranyl aquofluoride, [(UO2)2F8(H2O)2Zn2(4,4'-bpy)2].(4,4'-bpy), has been synthesized under hydrothermal conditions and has been structurally characterized by single-crystal X-ray diffraction, infrared spectroscopy, thermogravimetric analysis, emission spectroscopy, and solid-state NMR spectroscopy. It is one of the few uranium fluoride-organic framework solids in which an organic molecule is directly incorporated into the extended structure of the metal fluoride and is the first example of mixed-metal uranium oxyfluoride incorporating an organic ligand. The structure consists of neutral layers of edge- and corner-sharing uranium-centered pentagonal bipyramids and zinc-centered octahedra, which are linked through 4,4'-bpy ligands into a 3-D framework. The 1H MAS NMR spectrum is in support of the conclusion that the occluded 4,4'-bpy molecules in the structural channels are not protonated. Crystal data: monoclinic, space group P2(1)/c, a = 9.4630(5) A, b ...
Research Interests: Engineering, Materials Engineering, Condensed Matter Physics, Inorganic Chemistry, Materials Chemistry, and 15 moreCrystal Growth, Chemical, Solid State Chemistry, Advanced Materials, Multidisciplinary, Physical sciences, Hydrogen Bond, CHEMICAL SCIENCES, X ray diffraction, Particle Size, Single Crystal, Hydrothermal Synthesis, IR Spectroscopy, Three Dimensional, and Layered Architecture
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A mixed metal phosphate incorporating isonicotinate ligand, Cu(HINT)(VO2)(PO4), was hydrothermally synthesized and characterized by single-crystal X-ray diffraction and magnetic susceptibility. This compound crystallizes in the monoclinic... more
A mixed metal phosphate incorporating isonicotinate ligand, Cu(HINT)(VO2)(PO4), was hydrothermally synthesized and characterized by single-crystal X-ray diffraction and magnetic susceptibility. This compound crystallizes in the monoclinic space group C2/c with cell parameters a=22.033(1)Å, b=6.2986(3)Å, c=16.0202(9)Å, β=121.001(1), and Z=8. The structure consists of two-dimensional neutral sheets of CuVO2(PO4) with the dipolar isonicotinate ligand being coordinated to Cu ions as a pendent
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The first metal phosphate incorporating isonicotinate ligand, Zn(HINT)(HPO4), was hydrothermally synthesized and characterized by single-crystal X-ray diffraction and solid-state NMR spectroscopy. This compound crystallizes in the... more
The first metal phosphate incorporating isonicotinate ligand, Zn(HINT)(HPO4), was hydrothermally synthesized and characterized by single-crystal X-ray diffraction and solid-state NMR spectroscopy. This compound crystallizes in the monoclinic space group P21/c with cell parameters a=20.5643(8)Å, b=8.5169(4)Å, c=10.3928(4)Å, β=97.466(1)°, and Z=8. The structure consists of 2D neutral sheets of zinc hydrogen phosphate with the dipolar isonicotinate ligand being coordinated to zinc as
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Nanostructured zinc phosphite templated by cetyltrimethylammonium (CTA(+)) cations was synthesized using a hydro(solvo)thermal method. This is the first example of a crystalline metal phosphite containing long carbon tails of the CTA(+)... more
Nanostructured zinc phosphite templated by cetyltrimethylammonium (CTA(+)) cations was synthesized using a hydro(solvo)thermal method. This is the first example of a crystalline metal phosphite containing long carbon tails of the CTA(+) ions as templates in its structure, as is structurally characterized by single-crystal X-ray diffraction. The 2D inorganic structures with 4.8(2) topologies are constructed from the interconnection of tetrahedral ZnO3Br and HPO3 units, which are sandwiched between CTA(+) ion surfactants in a packing behavior of a largely lamellar liquid-crystalline structure to extend the interlayer d spacing to 28.05 Å. Adsorption experiment shows selective adsorption properties of 1-naphthol and a adsorption capacity of 0.17 mmol/mmol (CTA)ZnBr(HPO3). This compound has potential as an adsorbent for the removal of 1-naphthol pollutant from wastewater. In addition, the naphthol-adsorbed sample shows interesting luminescent properties that are different from that of an as-synthesized sample. The crystal structure, thermal stability, IR spectrum, adsorption, and photoluminescence properties have been studied.
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Two zinc germanates incorporating bidentate-bridging organic amine ligands have been synthesized under solvothermal conditions by using the amines as solvents. Their structural features are infinite chains formed of edge-sharing ZnO(4)N... more
Two zinc germanates incorporating bidentate-bridging organic amine ligands have been synthesized under solvothermal conditions by using the amines as solvents. Their structural features are infinite chains formed of edge-sharing ZnO(4)N trigonal bipyramids and unbranched vierer single layers with the composition [Ge(4)O(10)] and discrete ZnO(2)N(2) tetrahedra and unbranched zweier double chains with the composition [Ge(2)O(5)], respectively.
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The first examples of metal phosphite incorporating a squarate anion as a ligand have been synthesized by a hydrothermal method. Their structures contain zigzag chains of edge-sharing LnO(8) (Ln = Sm, Eu, and Gd) square antiprisms... more
The first examples of metal phosphite incorporating a squarate anion as a ligand have been synthesized by a hydrothermal method. Their structures contain zigzag chains of edge-sharing LnO(8) (Ln = Sm, Eu, and Gd) square antiprisms connected by phosphite groups to form 2D layers, which are pillared by squarate ligands into a 3D framework. The photoluminescence properties of the Eu compound have also been studied.
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Two new polymorphs, β- and γ-In(2)Ge(6)O(15)(NH(2)CH(2)CH(2)NH(2))(2), have been synthesized under solvothermal conditions using 2-methylpentamethylenediamine as a solvent and structurally characterized by single-crystal X-ray... more
Two new polymorphs, β- and γ-In(2)Ge(6)O(15)(NH(2)CH(2)CH(2)NH(2))(2), have been synthesized under solvothermal conditions using 2-methylpentamethylenediamine as a solvent and structurally characterized by single-crystal X-ray diffraction. Both structures contain single layers with the composition [Ge(6)O(15)] that are connected by In(2)O(6)N(4) octahedral dimers to form 3D frameworks. The germanate layers contain four-, six-, and eight-membered rings and six-membered rings in the β and γ polymorphs, respectively. Compounds with related structures are discussed for comparison.
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A new uranium(IV) fluorooxalate, UF3(H2O)(C2O4)0.5, has been synthesized by a hydrothermal method and structurally characterized by single-crystal X-ray diffraction, infrared spectroscopy, and thermogravimetric analysis. The structure... more
A new uranium(IV) fluorooxalate, UF3(H2O)(C2O4)0.5, has been synthesized by a hydrothermal method and structurally characterized by single-crystal X-ray diffraction, infrared spectroscopy, and thermogravimetric analysis. The structure consists of two-dimensional layers of corner- and edge-sharing tricapped trigonal prisms with the composition UF(4/2)F(2/2)O3 linked by bisbidentate oxalate ligands to form a three-dimensional framework. Magnetic susceptibilities were measured to confirm the tetravalent state of uranium. Crystal data: monoclinic, space group C2/c, a = 17.246(3) Angstroms, b = 6.088(1) Angstroms, c = 8.589(2) Angstroms, beta = 95.43(3) degrees, and Z = 8.
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Two organically-templated layered uranium(IV) fluorooxalates, (H(4)TREN)[U(2)F(6)(C(2)O(4))(3)].4H(2)O (1) (TREN = tris(2-aminoethyl)amine) and (H(4)APPIP)[U(2)F(6)(C(2)O(4))(3)].4H(2)O (2) (APPIP = 1,4-bis(3-aminopropyl)piperazine), have... more
Two organically-templated layered uranium(IV) fluorooxalates, (H(4)TREN)[U(2)F(6)(C(2)O(4))(3)].4H(2)O (1) (TREN = tris(2-aminoethyl)amine) and (H(4)APPIP)[U(2)F(6)(C(2)O(4))(3)].4H(2)O (2) (APPIP = 1,4-bis(3-aminopropyl)piperazine), have been synthesized by hydrothermal methods and structurally characterized by single-crystal X-ray diffraction, thermogravimetric analysis, and magnetic susceptibility. Both structures consist of anionic [U(2)F(6)(C(2)O(4))(3)](4-) layers separated by organic ammonium cations and lattice water molecules. The UF(3)O(6) polyhedra are connected by oxalate ligands in different ways within the layers. They are the first examples of organically-templated uranium fluorooxalates. Crystal data for compound 1 follow: monoclinic, P2(1)/c (No. 14), a = 19.1563(5) A, b = 8.9531(2) A, c = 16.6221(4) A, beta = 114.633(1) degrees, and Z = 4. Crystal data for compound are the same as those for 1 except a = 10.3309(8) A, b = 15.564(1) A, c = 17.537(1) A, and beta = 95.430(4) degrees.