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Full-Text Articles in Physical Sciences and Mathematics
Structure Determination Of Two New Incommensurate Compounds, Ba1+X[(CuXRh1-X)O3], With X = 0.1605 And X = 0.1695, Using A General Method Based On The Superspacegroup Approach, Mirvat Zakhour-Nakhl, John Claridge, Jacques Darriet, Francois Weill, Hans Conrad Zur Loye, Juan Perez-Mato
Structure Determination Of Two New Incommensurate Compounds, Ba1+X[(CuXRh1-X)O3], With X = 0.1605 And X = 0.1695, Using A General Method Based On The Superspacegroup Approach, Mirvat Zakhour-Nakhl, John Claridge, Jacques Darriet, Francois Weill, Hans Conrad Zur Loye, Juan Perez-Mato
Hans Conrad zur Loye
The single-crystal structures of two incommensurate compounds, Ba1+x[(CuxRh1-x)O3] with x = 0.1605 and x = 0.1695, were solved by a general method using the superspace group approach. A saw-tooth function was used to model both the occupational and displacive modulations. This approach requires very few refineable parameters and leads to low residuals, R = 0.0370 and R = 0.0330 for x = 0.1605 and x = 0.1695, respectively. The idealized structures of these two compounds consist of [(CuxRh1-x)O3]∞ chains containing groups of five face-shared (RhO6) octahedra separated by (CuO6) trigonal prisms. These chains in turn are separated from each other …
Structure Of Indium Iron Oxide, Daniel Giaquinta, William Davis, Hans Conrad Zur Loye
Structure Of Indium Iron Oxide, Daniel Giaquinta, William Davis, Hans Conrad Zur Loye
Hans Conrad zur Loye
InFeO3 is isostructural with the recently reported InMnO3. The structure of InFeO3 contains layers of In-O octahedra and Fe-O trigonal bipyramids. The trigonal bipyramids have ideal D34 symmetry. This unusual structure is unexpected within the context of known sesquioxide structures.
Catena-Poly[[Bis(Α-Thenoyltrifluoroacetonato-Κ2O,O')Copper(Ii)]-Μ-1,4-Di-3-Pyridyl-2,3-Diaza-1,3-Butadiene-Κ2N:N'], William J. Perkins, Tamar Maxwell, Ken B. Williams, Andrea M. Goforth, Mark D. Smith, Leroy Peterson Jr., Hans Conrad Zur Loye
Catena-Poly[[Bis(Α-Thenoyltrifluoroacetonato-Κ2O,O')Copper(Ii)]-Μ-1,4-Di-3-Pyridyl-2,3-Diaza-1,3-Butadiene-Κ2N:N'], William J. Perkins, Tamar Maxwell, Ken B. Williams, Andrea M. Goforth, Mark D. Smith, Leroy Peterson Jr., Hans Conrad Zur Loye
Hans Conrad zur Loye
The title compound, [Cu(C8H4F3O2S)2(C12H10N4)]n or [Cu(tta)2(L2)2]n (L2 = 1,4-di-3-pyridyl-2,3-diaza-1,3-butadiene and tta = -thenoyltrifluoroacetonate), consists of undulating chains containing two crystallographically distinct CuII centers that are each located on inversion centers. Each CuII center exhibits distorted octahedral coordination provided by two pyridyl N atoms from two equivalent L2 ligands and four O atoms from two equivalent tta ligands. The chains interact through weak C-FH-C contacts.
Poly[Μ2-Nitrato-(Μ4-Pyrazine-2-Carboxylato)Disilver(I)], Kathryn Seward, Joseph Ellsworth, Zeeshan Khaliq, Hans Conrad Zur Loye
Poly[Μ2-Nitrato-(Μ4-Pyrazine-2-Carboxylato)Disilver(I)], Kathryn Seward, Joseph Ellsworth, Zeeshan Khaliq, Hans Conrad Zur Loye
Hans Conrad zur Loye
The title compound, [Ag2(C5H3N2O2)(NO3)]n, is a three-dimensional coordination polymer containing two-dimensional slabs held together by bridging nitrate groups. AgNO4 and AgNO5 silver coordination polyhedra arise. Weak argentophilic interactions [AgAg = 3.0686 (7) Å] occur in the crystal structure.
Ac Susceptibility Of Sr3CuptXIr1-XO6: A Magnetic System With Competing Interactions And Dimensionality, S Irons, T Sangrey, K Beauchamp, M Smith, Hans Conrad Zur Loye
Ac Susceptibility Of Sr3CuptXIr1-XO6: A Magnetic System With Competing Interactions And Dimensionality, S Irons, T Sangrey, K Beauchamp, M Smith, Hans Conrad Zur Loye
Hans Conrad zur Loye
Sr3CuPtxIr1-xO6 has been cited as an example of a one-dimensional quantum spin chain with competing ferromagnetic and antiferromagnetic interactions. We have measured the ac susceptibility of Sr3CuPtxIr1-xO6 with x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, and 0.7, in magnetic fields of 0–60 kOe, and at temperatures down to 0.275 K. Our data show that the x=endpoint Sr3CuIrO6, exhibits long-range ferromagnetic order at T=20.1 K, contrary to results from dc susceptibility studies which indicated that it remained a one-dimensional ferromagnet to below 4 K. When platinum is substituted for iridium, antiferromagnetic couplings are introduced, and the susceptibility shows a diminishing signature …
“[Cu(Pyrazine-2-Carboxylate)2]2Cd4I8: Unprecedented 1-D Serpentine Chains And Regular 2-D Regular Metal-Organic Square Grids In A 3-D Framework., Delia Ciurtin, Mark Smith, Hans Conrad Zur Loye
“[Cu(Pyrazine-2-Carboxylate)2]2Cd4I8: Unprecedented 1-D Serpentine Chains And Regular 2-D Regular Metal-Organic Square Grids In A 3-D Framework., Delia Ciurtin, Mark Smith, Hans Conrad Zur Loye
Hans Conrad zur Loye
A novel three-dimensional coordination polymer containingan unprecedented one-dimensional serpentine motif conjoinedwith a two-dimensional square grid motif is presented.
Poly[Diaqua(Μ4-3-Fluorophthalato-Κ4O:O:O':O'')Cadmium(Ii)], Diana Rishmawi, Katie Lewis, Mark Smith, Leroy Peterson, Hans Conrad Zur Loye
Poly[Diaqua(Μ4-3-Fluorophthalato-Κ4O:O:O':O'')Cadmium(Ii)], Diana Rishmawi, Katie Lewis, Mark Smith, Leroy Peterson, Hans Conrad Zur Loye
Hans Conrad zur Loye
The crystal structure of the title compound, [Cd(C8H3FO4)(H2O)2]n, consists of polymeric sheets formed by the bridging of octahedrally coordinated CdII by carboxylate O atoms of the 3-fluorophthalate (3-fpt2-) ligand. The layers exhibit hydrogen bonding between each of two coordinated water molecules and two O atoms of the ligand. Adjacent sheets are connected through - interactions.
Crystal Growth, Structure Determination And Magnetism Of A New Hexagonal Rhodate: Ba9rh8o24, Katharine E. Stitzer, M. D. Smith, J. Darriet, Hans Conrad Zur Loye
Crystal Growth, Structure Determination And Magnetism Of A New Hexagonal Rhodate: Ba9rh8o24, Katharine E. Stitzer, M. D. Smith, J. Darriet, Hans Conrad Zur Loye
Hans Conrad zur Loye
Single crystals of Ba9Rh8O24, grown from a molten potassium carbonate flux, crystallize in the spacegroup R¯3c with lattice parameters of a = 10.0899(4) and c = 41.462(2) Å. Magnetic measurements on oriented single crystals reveal the existence of magnetic anisotropy
Sr3Mgpto6, Mark Smith, Hans Conrad Zur Loye
Sr3Mgpto6, Mark Smith, Hans Conrad Zur Loye
Hans Conrad zur Loye
Single crystals of the mixed alkaline earth platinate, tristrontium magnesium platinum hexaoxide, Sr3MgPtO6, were grown from a KOH flux at 1273 K. The compound adopts the rhombohedral K4CdCl6 structure type, featuring chains of face-shared, distorted MgO6 trigonal prisms (Mg site symmetry 32) and PtO6 octahedra (Pt site symmetry ) surrounded by columns of Sr2+ ions (Sr site symmetry 2).
Growth Of Sr6Rh5O15 Single Crystals From High Temperature Solutions: 1. Structure Determination Using The Traditional 3d And The 4d Superspace Group Methods. 2. Magnetic Measurements On Oriented Single Crystals, Katherine Stitzer, Ahmed Abed, Jacques Darriet, Hans Conrad Zur Loye
Growth Of Sr6Rh5O15 Single Crystals From High Temperature Solutions: 1. Structure Determination Using The Traditional 3d And The 4d Superspace Group Methods. 2. Magnetic Measurements On Oriented Single Crystals, Katherine Stitzer, Ahmed Abed, Jacques Darriet, Hans Conrad Zur Loye
Hans Conrad zur Loye
Single crystals of Sr6Rh5O15 were grown from a molten potassium carbonate flux. The structure was solved by both the traditional 3-D crystallographic approach and the 4-D superspace group approach using JANA2000. Both methods produced an equivalent structure determination, thereby confirming the 4-D superspace group approach as an effective structure solution method for 3-D commensurate composite structures. Sr6Rh5O15 corresponds to the n = 1, m = 1 member of the A3n+3mA‘nB3m+nO9m+6n family of 2H hexagonal …
Poly[[(Μ-2,2'-Bipyrimidine-Κ4N1,N1':N3,N3')(Μ-Sulfato-Κ2O:O')Zinc(Ii)] Monohydrate], Aaron Oxendine, Jennifer Kelley, Leroy Peterson Jr., Mark D. Smith, Hans Conrad Zur Loye
Poly[[(Μ-2,2'-Bipyrimidine-Κ4N1,N1':N3,N3')(Μ-Sulfato-Κ2O:O')Zinc(Ii)] Monohydrate], Aaron Oxendine, Jennifer Kelley, Leroy Peterson Jr., Mark D. Smith, Hans Conrad Zur Loye
Hans Conrad zur Loye
In the title compound, {[Zn(SO4)(C8H6N4)]·H2O}n, the ZnII atom is in a distorted octahedral environment. The ZnII atoms are bridged by both 2,2'-bipyrimidine and sulfate ligands, thus forming a three-dimensional polymeric metal-organic solid that contains uncoordinated water molecules in the interstitial space. O-HO hydrogen bonding consolidates the crystal structure.
Changes In The Electronic Structure Of Ni/TioX Composites As A Function Of Reduction Temperature, Hans Conrad Zur Loye, Angelica Stacy
Changes In The Electronic Structure Of Ni/TioX Composites As A Function Of Reduction Temperature, Hans Conrad Zur Loye, Angelica Stacy
Hans Conrad zur Loye
Transition-metal catalysts are dispersed on high surface area oxide supports in order to obtain a large catalytic activity per metal atom. Many supports, such as SiO2, and A1203, are considered to be inert; that is, these supports do not alter the intrinsic activity of the metal significantly but only serve to increase the surface area of the metal and prevent sintering. For some oxide supports, however, there is a strong interaction between the metal and the support. In particular, TiO2, can affect the activity of the supported metal depending on the conditions under which the metal-titanium dioxide composite is prepared. …
Poly[(Nitrato-KO)Tris((Μ3-1h-1,2,4-Triazolato)Dizinc(Ii)]: A Three-Dimensional Coordination Polymer, Josephy Ellsworth, Mark Smith, Hans Conrad Zur Loye
Poly[(Nitrato-KO)Tris((Μ3-1h-1,2,4-Triazolato)Dizinc(Ii)]: A Three-Dimensional Coordination Polymer, Josephy Ellsworth, Mark Smith, Hans Conrad Zur Loye
Hans Conrad zur Loye
In the title compound, [Zn2(C2H2N3)3(NO3)], there are two unique Zn atoms, both with site symmetry m. One forms a ZnN3O tetrahedron and the other a ZnN6 octahedron. One and a half 1H-1,2,4-triazolate ligands, with the half-ligand located on a mirror plane, and a disordered nitrate anion complete the asymmetric unit of the structure. The polymeric connectivity is three-dimensional.
Surface Chemistry Of Nickel Supported On TiNO2n-1, Hans Conrad Zur Loye, Tanya Faltens, Angelica Stacy
Surface Chemistry Of Nickel Supported On TiNO2n-1, Hans Conrad Zur Loye, Tanya Faltens, Angelica Stacy
Hans Conrad zur Loye
Small metal particles dispersed on inorganic oxides are among the most important heterogeneous catalysts. While the primary function of the oxide support is to increase the metal surface area, these supports can cause pronounced changes in the catalytic and chemisorption properties of the metal. In particular, metals supported on TiO2, have attracted attention due to the observation that activity and selectivity for Fischer-Tropsch synthesis can be altered, depending on the temperature a t which the metal Ti02 composite is reduced. Furthermore, H2 and CO chemisorption are suppressed for composites reduced at higher temperatures. In this paper, we show that the …