scholarly journals Dicaesium tetramagnesium pentakis(carbonate) decahydrate, Cs2Mg4(CO3)5·10H2O

IUCrData ◽  
2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Christine Rincke ◽  
Horst Schmidt ◽  
Wolfgang Voigt
Keyword(s):  
Crystal Structure ◽  
Water Molecule ◽  
Aqueous Solutions ◽  
Room Temperature ◽  
Free Water ◽  
Magnesium Nitrate ◽  
Monoclinic Crystal ◽  
Free Water Molecule ◽  
Monoclinic Crystal Structure

The title carbonate hydrate, Cs2Mg4(CO3)5·10H2O, was crystallized at room temperature out of aqueous solutions containing caesium bicarbonate and magnesium nitrate. Its monoclinic crystal structure (P21/n) consists of double chains of composition 1 ∞[Mg(H2O)2/1(CO3)3/3], isolated [Mg(H2O)(CO3)2]2– units, two crystallographically distinct Cs+ ions and a free water molecule. The crystal under investigation was twinned by reticular pseudomerohedry.

High-pressure effect on the chain-like crystal structure of the semiconductors TlFeSe2 and TlFeS2

2015 ◽  
Vol 29 (08) ◽  
pp. 1550024 ◽  
Author(s):  
E. B. Asgerov ◽  
N. T. Dang ◽  
D. I. Ismayilov ◽  
S. E. Kichanov ◽  
R. N. Mehdiyeva ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Room Temperature ◽  
Structural Parameters ◽  
Monoclinic Crystal ◽  
One Dimensional ◽  
Monoclinic Crystal Structure ◽  
Anisotropic Lattice ◽  
The One ◽  
Lattice Compression

The crystal structure of the semiconductors TlFeSe 2 and TlFeS 2 has been studied by mean of neutron diffraction at room temperature and high pressure up to 4.2 GPa and 5.2 GPa, respectively. The chain-like monoclinic crystal structure with space group C2/m remains unchanged in both compounds in the entire pressure range. The anisotropic lattice compression and the large difference in the bulk modulus and the compressibility coefficients of the structural parameters of the two compounds have been observed. The mechanism of the observed phenomena was discussed. The enhancement of the one-dimensional antiferromagnetic and metallic character was predicted.

Diaquaiodidotetrasarcosinepotassium: an overview of sarcosine metal halogenide structures

2012 ◽  
Vol 69 (1) ◽  
pp. 11-16 ◽  
Author(s):  
Michel Fleck ◽  
Vahram V. Ghazaryan ◽  
Aram M. Petrosyan
Keyword(s):  
Crystal Structure ◽  
Water Molecule ◽  
Potassium Iodide ◽  
Monoclinic Crystal ◽  
Space Group ◽  
Short Overview ◽  
Monoclinic Crystal Structure

The monoclinic crystal structure of tetrasarcosine potassium iodide dihydrate {orcatena-poly[[potassium-tetra-μ-sarcosine-κ4O:O′;κ4O:O] iodide dihydrate]}, {[K(C3H7NO2)4]I·2H2O}nor Sar4·KI·2H2O (space groupC2/c), comprises two crystallographically different sarcosine molecules and one water molecule on general positions, and one K+cation and one I−anion located on twofold axes. The irregular eight-coordinated K+polyhedra are connected into infinite chains along [001]viasarcosine molecules. This compound is the first sarcosine metal halogenide salt with a 4:1 ratio. A short overview of other sarcosine metal halogenide salts is presented and relationships to similar glycine salts are discussed.

Preparation, Crystal Structure, and Properties of the Lanthanoid Carbides Ln4C7 with Ln = Ho, Er, Tm, and Lu

1996 ◽  
Vol 51 (5) ◽  
pp. 646-654 ◽  
Author(s):  
Ralf Czekalla ◽  
Wolfgang Jeitschko ◽  
Rolf-Dieter Hoffmann ◽  
Helmut Rabeneck
Keyword(s):  
Crystal Structure ◽  
Rietveld Method ◽  
Magnetic Ordering ◽  
Monoclinic Crystal ◽  
X Ray ◽  
Neutron Powder Diffraction Data ◽  
Monoclinic Crystal Structure ◽  
Arc Melting ◽  
Structure Factors ◽  
Hydrolysis Of

The isotypic carbides Ln4C7 (Ln = Ho, Er, Tm, Lu) were prepared by arc-melting of the elemental components, followed by annealing at 1300 °C. The positions of the metal and of some carbon atoms of the monoclinic crystal structure of LU4C7 were determined from X-ray powder data, and the last carbon positions were found and refined from neutron powder diffraction data: P21/c, a = 360.4(1), b = 1351.4(3), c = 629.0(2) pm, β = 104.97(2)°, Z = 2, R = 0.026 for 429 structure factors and 15 positional parameters. The structure contains isolated carbon atoms with octahedral lutetium coordination and linear C3-units, with C-C bond lengths of 132(1) and 135(1) pm. This carbide may therefore be considered as derived from methane and propadiene. The hydrolysis of LU4C7 with distilled water yields mainly methane and propine, while the hydrolyses of the corresponding holmium and erbium carbides resulted in relatively large amounts of saturated and unsaturated C2-hydrocarbons in addition to the expected products methane and propine. The structure comprises two-dimensionally infinite NaCl-type building elements, which are separated by the C3-units. It may be described as a stacking variant of a previously reported structure of HO4C7, now designated as the a-modification. The Lu4C7-type β -modification was obtained at higher temperatures. Its structure was refined by the Rietveld method from X-ray powder data to a residual R = 0.037 for 320 F values and 15 positional parameters. Lu4C7 is Pauli paramagnetic; β -HO4C7 and Er4C7 show Curie-Weiss behavior with magnetic ordering temperatures of less than 20 K.

trans-Bis(O-ethylxanthato)bis(triphenylphosphine)ruthenium(III) hexafluorophosphate monohydrate

2006 ◽  
Vol 62 (5) ◽  
pp. m1077-m1078
Author(s):  
Yuko Ohuchi ◽  
Kyoko Noda ◽  
Takayoshi Suzuki ◽  
Kazuo Kashiwabara ◽  
Hideo D. Takagi
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Complex Cation ◽  
Orthorhombic Crystal ◽  
Monoclinic Crystal ◽  
Monoclinic Crystal Structure

In the monoclinic crystal structure of the title compound, trans-[Ru(C3H5OS2)2(C18H15P)2]PF6·H2O, the structure of the RuIII complex cation is very similar to that in the orthorhombic crystal of the nonhydrated complex [Noda, Ohuchi, Hashimoto, Fujiki, Itoh, Iwatsuki, Noda, Suzuki, Kashiwabara & Takagi (2006), Inorg. Chem. 45, 1349–1355]. In the present crystal structure, the P—Ru—P bond axes of the complex cations are aligned parallel to the [101] direction.

Die Kristallstruktur von 2,4-Diaminovinamidinium-bis-tetrachloroferrat(III), (C9H16N4) [FeCl4]2 / The Crystal Structure of 2,4-Diaminovinamidinium Bis-tetrachloroferrate(III), (C9H16N4)[FeCl4]

1996 ◽  
Vol 51 (8) ◽  
pp. 1137-1140 ◽  
Author(s):  
Michael Feist ◽  
Sergej Trojanov ◽  
Erhard Kemnitz
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Aqueous Solutions ◽  
Room Temperature ◽  
Orthorhombic Space Group ◽  
Interatomic Distances ◽  
Space Group

(davaH2)[FeCl4]2 crystallizes at room temperature from aqueous solutions of 2,4-diaminovinamidinium hydrochloride, (davaH)Cl, and FeCl3 in 3M HCl in the orthorhombic space group Pca21 with a=14.108(3), b = 16.502(3), c = 18.919(4) Å, Z=8. The structure consists of diprotonated tricyclic (davaH2)2+ cations and slightly distorted tetrahedral [FeCl4]- anions. The cations are bent around the central heptacycle forming boat-like units. One of the two independent cations is disordered between two positions. Some interatomic distances N···Cl are interpreted in terms of N-H···Cl hydrogen bonds.

Electron density, disorder and polymorphism: high-resolution diffraction studies of the highly polymorphic neuralgic drug carbamazepine

2016 ◽  
Vol 72 (1) ◽  
pp. 39-50 ◽  
Author(s):  
Ioana Sovago ◽  
Matthias J. Gutmann ◽  
Hans Martin Senn ◽  
Lynne H. Thomas ◽  
Chick C. Wilson ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Diffraction Data ◽  
Structural Formula ◽  
Orthorhombic Crystal ◽  
Monoclinic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Monoclinic Crystal Structure

Analysis of neutron and high-resolution X-ray diffraction data on form (III) of carbamazepine at 100 K using the atoms in molecules (AIM) topological approach afforded excellent agreement between the experimental results and theoretical densities from the optimized gas-phase structure and from multipole modelling of static theoretical structure factors. The charge density analysis provides experimental confirmation of the partially localized π-bonding suggested by the conventional structural formula, but the evidence for any significant C—N π bonding is not strong. Hirshfeld atom refinement (HAR) gives H atom positional and anisotropic displacement parameters that agree very well with the neutron parameters. X-ray and neutron diffraction data on the dihydrate of carbemazepine strongly indicate a disordered orthorhombic crystal structure in the space groupCmca, rather than a monoclinic crystal structure in space groupP21/c. This disorder in the dihydrate structure has implications for both experimental and theoretical studies of polymorphism.

Crystal chemistry of inorganic compounds based on chains of oxocentered tetrahedra III. Crystal structure of georgbokiite, Cu5O2(SeO3)2Cl21

1999 ◽  
Vol 214 (3) ◽  
Author(s):  
S. V. Krivovichev ◽  
R. R. Shuvalov ◽  
T. F. Semenova ◽  
S. K. Filatov
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
Crystal Chemistry ◽  
Inorganic Compounds ◽  
New Mineral ◽  
Monoclinic Crystal ◽  
Monoclinic Crystal Structure

AbstractThe monoclinic crystal structure of georgbokiite, a new mineral with the chemical composition Cu

scholarly journals The monoclinic crystal structure form of bacterioferritin fromE. coli

1996 ◽  
Vol 52 (a1) ◽  
pp. C177-C177
Author(s):  
M. Hospital ◽  
A. Dautant ◽  
J. Yariv ◽  
G. Précigoux ◽  
A. J. Kalb (Gilboa) ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Form ◽  
Monoclinic Crystal ◽  
Monoclinic Crystal Structure

scholarly journals Influence of bath temperature on microstructure and NH3 sensing properties of chemically synthesized CdO thin films

2019 ◽  
Vol 37 (1) ◽  
pp. 25-32
Author(s):  
A.K. Sharma ◽  
S.S. Potdar ◽  
M.A. Yewale ◽  
Deepak B. Shirgaonkar ◽  
K.S. Pakhare ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
High Temperature ◽  
Band Gap ◽  
Room Temperature ◽  
Nitrate Solution ◽  
Cadmium Nitrate ◽  
Monoclinic Crystal ◽  
Cdo Thin Films ◽  
Deposited Films

AbstractCadmium oxide (CdO) thin films were synthesized using chemical bath deposition (CBD) method from aqueous cadmium nitrate solution. The bath temperatures were maintained at room temperature (25 °C) and at higher temperature (80 °C). The structural studies revealed that the films showed mixed phases of CdO and Cd(OH)2 with hexagonal/monoclinic crystal structure. Annealing treatment removed the hydroxide phase and the films converted into pure CdO with cubic, face centered crystal structure. SEM micrographs of as-deposited films revealed nanowire-like morphology for room temperature deposited films while nanorod-like morphology for high temperature deposited films. However, cube-like morphology was observed after air annealing. Elemental composition was confirmed by EDAX analysis. Band gap energies of the as-deposited films varied over the range of 3 eV to 3.5 eV, whereas the annealed films showed band gap energy variation in the range of 2.2 eV to 2.4 eV. The annealed films were successfully investigated for NH3 sensing at different operating temperatures and at different gas concentrations. The room temperature synthesized film showed a response of 17.3 %, whereas high temperature synthesized film showed a response of 13.5 % at 623 K upon exposure to 24 ppm of NH3.

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