scholarly journals Hybrid Layered Crystal Comprising Polyoxometalate and Surfactant Synthesized from Reduced Mo-Blue Species

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Keisuke Mikurube ◽  
Kimiko Hasegawa ◽  
Haruo Naruke ◽  
Takeru Ito
Keyword(s):  
Structure Analysis ◽  
Single Phase ◽  
Proton Conductor ◽  
Starting Material ◽  
Layered Crystal ◽  
Two Dimensional ◽  
X Ray ◽  
New Class ◽  
Layered Crystals ◽  
Inorganic Layers

A hybrid layered crystal containing polyoxomolybdate was successfully synthesized from reduced Mo-blue species as starting material. The hybrid crystal, [C5H5N(C16H33)]2[β-H2Mo8O26]·2C2H5OH (C16py-H2Mo8), was obtained as a single phase by the gradual oxidation of hexadecylpyridinium-Mo-blue (C16py-Mo-blue) hybrid. The X-ray structure analysis revealed that C16py-H2Mo8comprisedβ-type octamolybdate anion with two protons (β-H2Mo8). Theβ-H2Mo8anions and ethanol molecules of crystallization formed two-dimensional anionic layers. The pyridine rings of C16py did not attend to form the two-dimensional inorganic layers, and the interdigitated C16py bilayers were sandwiched by theβ-H2Mo8anionic layers with periodicity of 18.2 Å. These C16py-H2Mo8hybrid layered crystals possibly work as a new class of proton conductor.

Facile Synthesis of 4,5-Dihydro-1,3,4-Thiadiazoles by 1,3-Dipolar Cycloaddition of Thioisomünchnones

2009 ◽  
Vol 62 (4) ◽  
pp. 356 ◽  
Author(s):  
Bárbara Sánchez ◽  
José Luis Bravo ◽  
María Josí Arívalo ◽  
Ignacio López ◽  
Mark E. Light ◽  
...  
Keyword(s):  
Structure Analysis ◽  
Structure Elucidation ◽  
Room Temperature ◽  
Dipolar Cycloaddition ◽  
Two Dimensional ◽  
Facile Synthesis ◽  
X Ray ◽  
Mild Conditions ◽  
Nmr Techniques

The present paper summarizes a straightforward synthesis of 4,5-dihydro-1,3,4-thiadiazoles by the 1,3-dipolar cycloaddition of thioisomünchnones. These reactions have been carried out in dichloromethane and are essentially complete within 60 min at room temperature. Under such mild conditions the asymmetric version has been explored as well. Unequivocal structure elucidation has been accomplished by means of one- and two-dimensional NMR techniques as well as X-ray structure analysis.

REBa2ZrO5.5 (RE = La, Ce, Eu, and Yb): Synthesis, characterization, and their potential use as substrates for YBa2Cu3O7–δ superconductors

1997 ◽  
Vol 12 (11) ◽  
pp. 2976-2980 ◽  
Author(s):  
R. Jose ◽  
Asha M. John ◽  
J. Kurian ◽  
P. K. Sajith ◽  
J. Koshy
Keyword(s):  
Single Phase ◽  
Detrimental Effect ◽  
Solid State Reaction Method ◽  
Dielectric Constants ◽  
X Ray Diffraction ◽  
X Ray ◽  
Resistivity Measurements ◽  
New Class ◽  
Zero Resistance ◽  
Potential Use

A new class of complex perovskites REBa2ZrO5.5 (where RE = La, Ce, Eu, and Yb) have been synthesized and sintered as single phase materials by the solid state reaction method. The structure of these materials was studied by x-ray diffraction, and all of them were found to be isostructural, having a cubic perovskite structure. X-ray diffraction and resistivity measurements have shown that there is no detectable chemical reaction between YBa2Cu3O7–delta; and REBa2ZrO5.5 even under severe heat treatment at 950 °C, and that the addition of REBa2ZrO5.5 up to 20 vol.% in YBa2Cu3O7–δ shows no detrimental effect on the superconducting properties of YBa2Cu3O7-δ. Dielectric constants and loss factors are in the range suitable for their use as substrates for microwave applications. Thick films of YBa2Cu3O7–δ fabricated on polycrystalline REBa2ZrO5.5 substrates gave a zero resistance transition temperature Tc(0) ∼ 92 K, indicating the suitability of these materials as substrates for YBa2Cu3O7–δ.

scholarly journals X-ray structure analysis of symmetrically substituted 1,1′-diformylruthenocene

2018 ◽  
Vol 74 (9) ◽  
pp. 1186-1189
Author(s):  
Bertin Anzaldo ◽  
Pankaj Sharma ◽  
Francisco Lara Ochoa ◽  
Claudia P. Villamizar C. ◽  
René Gutiérrez Pérez
Keyword(s):  
Structure Analysis ◽  
Room Temperature ◽  
Dimensional Structure ◽  
Two Dimensional ◽  
Asymmetric Unit ◽  
Orthorhombic System ◽  
Space Group ◽  
X Ray ◽  
Π Interactions ◽  
Independent Molecules

1,1′-Diformylruthenocene, [Ru(C6H5O)2], crystallizes in the orthorhombic system in the P212121 space group at room temperature. There are two crystallographically independent molecules in the asymmetric unit. The cyclopentadienyl rings have eclipsed configuration. The molecules self-assemble in a two-dimensional structure by C—H...O and C—H...π interactions with cisoid relative orientations of the two formyl groups. The crystal studied was refined as an inversion twin.

Preparation of Nanocomposites Containing Poly(Ethylene Oxide) and MoS2, TiS2, or MoO3

1994 ◽  
Vol 351 ◽  
Author(s):  
John P. Lemmon ◽  
Jinghe Wu ◽  
Michael M. Lerner
Keyword(s):  
Ethylene Oxide ◽  
Single Phase ◽  
X Ray Diffraction ◽  
Solid Product ◽  
X Ray ◽  
Elemental Analyses ◽  
Poly Ethylene Oxide ◽  
Layered Solid ◽  
Poly Ethylene ◽  
Inorganic Layers

ABSTRACTSingle-phase nanocomposites containing montmorillonite, MoS2, MoO3 or TiS2 with poly(ethylene oxide) are obtained by the exfoliation of the layered solid, adsorption of polymer, and subsequent precipitation of solid product. Aqueous solutions can be employed for all syntheses except PEO/TiS2, which is prepared from lithiated TiS2 in an N-methyl formamide (NMF) solution. X-ray diffraction indicates that the resulting solids increase in basal-plane repeat by approximately 4 or 8 Å, consistent with the incorporation of a single or double layer of polymer between the inorganic layers. Reaction stoichiometries and elemental analyses provide compositions for the single-phase products.

A PASE Approach to the Synthesis of Benzimidazopurines as Polycondensed Purine Derivatives

Synthesis ◽  
2020 ◽  
Vol 52 (23) ◽  
pp. 3622-3631
Author(s):  
Victor V. Fedotov ◽  
Evgeny N. Ulomsky ◽  
Konstantin V. Savateev ◽  
Evgeny M. Mukhin ◽  
Denis A. Gazizov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Medicinal Chemistry ◽  
Crystal Structure Analysis ◽  
Purine Derivatives ◽  
Acidic Media ◽  
X Ray ◽  
New Class ◽  
Highly Efficient ◽  
Derivatives Of

A highly efficient PASE approach to a new class of polycyclic purine derivatives has been proposed. The strategy includes a consecutive reduction, auto-aromatization, and heterocyclization of the initial nitrobenzimidazopyrimidines obtained by a three-component condensation. It was shown that reduction of nitrobenzimidazopyrimidines by metals in acidic media was more efficient than heterogeneous hydro­genation. Novel derivatives of benz[4,5]imidazo[1,2-a]purines were obtained­ in good yields and the proposed structure was confirmed by X-ray crystal structure analysis. The obtained convergent benzimidazopurines combine two relevant medicinal chemistry scaffolds – benz­imidazole and purine.

Two-Dimensional Layered Metal - Organic Frameworks of Lanthanum(III) Pyridine-2,6-dicarboxylate

2009 ◽  
Vol 62 (12) ◽  
pp. 1667 ◽  
Author(s):  
Yong-Ru Liu ◽  
Tao Yang ◽  
Lei Li ◽  
Jun-Min Liu ◽  
Cheng-Yong Su
Keyword(s):  
Crystal Packing ◽  
Metal Organic Frameworks ◽  
Thermal Conditions ◽  
Layered Crystal ◽  
Two Dimensional ◽  
Coordination Environment ◽  
X Ray ◽  
Local Coordination ◽  
Metal Organic ◽  
Coordinated Water

Three two-dimensional (2D) LaIII metal–organic frameworks, {[La4(pda)6(H2O)8]·2H2O} n (1), {[La2(pda)3(H2O)4]·H2O} n (2), and {[La2(pda)2(H2O)5SO4]·2H2O} n (3) (pda = pyridine-2,6-dicarboxylate), have been synthesized under hydro(solvo)thermal conditions and characterized by means of X-ray single-crystal diffraction, X-ray powder diffraction, and IR spectroscopy. Complexes 1 and 2 crystallize in the same triclinic system of a P-1 space group, share the same composition, and 4·82 net topology, but have a different local coordination environment and symmetry for the LaIII ions, thus they form a pair of supramolecular isomers. Complex 3 contains two kinds of crystallographically independent LaIII ions and bis-chelating SO4 2– anions, to generate a 2D grid structure of (4, 4) topology. All three complexes display layered crystal packing in the crystal lattice. The thermogravimetric analyses indicate that the solvated and coordinated water molecules in all complexes can be removed upon heating, and the frameworks decompose above 400°C.

scholarly journals A new approach for structure analysis of two-dimensional membrane protein crystals using X-ray powder diffraction data

2011 ◽  
Vol 20 (2) ◽  
pp. 457-464 ◽  
Author(s):  
R. A. Dilanian ◽  
C. Darmanin ◽  
J. N. Varghese ◽  
S. W. Wilkins ◽  
T. Oka ◽  
...  
Keyword(s):  
Membrane Protein ◽  
Structure Analysis ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Protein Crystals ◽  
Two Dimensional ◽  
Powder Diffraction Data ◽  
New Approach ◽  
X Ray

The Kepler tiling as the oldest complex surface structure in history: X-ray structure analysis of a two-dimensional oxide quasicrystal approximant

2016 ◽  
Vol 231 (12) ◽  
Author(s):  
Sumalay Roy ◽  
Katayoon Mohseni ◽  
Stefan Förster ◽  
Martin Trautmann ◽  
Florian Schumann ◽  
...  
Keyword(s):  
Surface Structure ◽  
Structure Analysis ◽  
Complex Surface ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray

Abstract:We have carried out a surface X-ray diffraction (SXRD) analysis of the approximant structure related to the recently discovered two-dimensional dodecagonal oxidic quasicrystal. The structure is characterized by the 3

The Stability and Conformation of the 1,3,6,8-Tetraazatricyclo[4.4.1.13,8]dodecane System: the Structure of the Condensation Product of 1,2-Diaminocyclohexane and Formaldehyde

1975 ◽  
Vol 53 (13) ◽  
pp. 1933-1935 ◽  
Author(s):  
P. Murray-Rust ◽  
F. G. Riddell
Keyword(s):  
Structure Analysis ◽  
Condensation Product ◽  
Optically Active ◽  
Starting Material ◽  
Analogous Reaction ◽  
X Ray ◽  
The Stability

The condensation of d,1-trans-1,2-diaminocyclohexane with formaldehyde gives a pentacyclic molecule based on the 1,3,6,8-tetraazatricyclo[4.4.1.13,8]dodecane nucleus. This was shown to have S4 symmetry by 1H n.m.r. and an X-ray analysis showed crystals to be orthorhombic, Fddd, a = 12.02, b = 19.25, c = 12.90 Å. The symmetry of the compound in the crystal was D2d due to a disordered arrangement and structure analysis was carried out to R = 0.166. When optically active diamine was used as starting material, the analogous reaction did not occur and this was attributed to strain in the tricyclic system. The conformation of the molecule is related to those of similar compounds as found by X-ray analysis.

Sign in / Sign up

Export Citation Format

Share Document