scholarly journals β-Li0.37Na0.63Fe(MoO4)2

2014 ◽  
Vol 70 (2) ◽  
pp. i9-i10 ◽  
Author(s):  
Amira Souilem ◽  
Mohamed Faouzi Zid ◽  
Ahmed Driss
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Reaction ◽  
Title Compound ◽  
General Position ◽  
Site Occupancy ◽  
The Other ◽  
Main Structure ◽  
Axis Direction ◽  
A Site

The title compound, lithium/sodium iron(III) bis[orthomolybdate(VI)], was obtained by a solid-state reaction. The main structure units are an FeO6octahedron, a distorted MoO6octahedron and an MoO4tetrahedron sharing corners. The crystal structure is composed of infinite double MoFeO11chains along theb-axis direction linked by corner-sharing to MoO4tetrahedra so as to form Fe2Mo3O19ribbons. The cohesion between ribbonsviamixed Mo—O—Fe bridges leads to layers arranged parallel to thebcplane. Adjacent layers are linked by corners shared between MoO4tetrahedra of one layer and FeO6octahedra of the other layer. The Na+and Li+ions partially occupy the same general position, with a site-occupancy ratio of 0.631 (9):0.369 (1). A comparison is made withAFe(MoO4)2(A= Li, Na, K and Cs) structures.

scholarly journals Crystal structure of disodium dicobalt(II) iron(III) tris(orthophosphate) with an alluaudite-like structure

2015 ◽  
Vol 71 (5) ◽  
pp. 558-560 ◽  
Author(s):  
Adam Bouraima ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
Thomas Makani ◽  
Lahcen El Ammari
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Reaction ◽  
Title Compound ◽  
General Position ◽  
Three Dimensional ◽  
The Other ◽  
Space Group ◽  
Open Framework ◽  
Wyckoff Position

The title compound, Na2Co2Fe(PO4)3, was synthesized by a solid-state reaction. This new stoichiometric phase crystallizes in an alluaudite-like structure. In this structure, all atoms are in general positions except for four atoms which are located at the special positions of theC2/cspace group. One Co atom, one P and one Na atom are all located on Wyckoff position 4e(2), while the second Na atom is located on an inversion centre 4a(-1). The other Co and Fe atoms occupy a general position with a statistical distribution. The open framework results from [(Co,Fe)2O10] units of edge-sharing [(Co,Fe)O6] octahedra, which alternate with [CoO6] octahedra that form infinite chains running along the [10-1] direction. These chains are linked together through PO4tetrahedra by the sharing of vertices so as to build layers perpendicular to [010]. The three-dimensional framework is accomplished by the stacking of these layers, leading to the formation of two types of tunnels parallel to [010] in which the Na+cations are located, each cation being surrounded by eight O atoms.

scholarly journals Na3Co2(As0.52P0.48)O4(As0.95P0.05)2O7

2013 ◽  
Vol 69 (12) ◽  
pp. i85-i86 ◽  
Author(s):  
Youssef Ben Smida ◽  
Abderrahmen Guesmi ◽  
Mohamed Faouzi Zid ◽  
Ahmed Driss
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Title Compound ◽  
General Position ◽  
Structural Model ◽  
Three Dimensional ◽  
The Other ◽  
Coordination Polyhedra ◽  
Bond Valence Sum ◽  
Full Occupancy

The title compound, trisodium dicobalt(II) (arsenate/phosphate) (diarsenate/diphosphate), was prepared by a solid-state reaction. It is isostructural with Na3Co2AsO4As2O7. The framework shows the presence of CoX22O12(X2 is statistically disordered with As0.95P0.05) units formed by sharing corners between Co1O6octahedra andX22O7groups. These units form layers perpendicular to [010]. Co2O6octahedra andX1O4(X1 = As0.54P0.46) tetrahedra form Co2X1O8chains parallel to [001]. Cohesion between layers and chains is ensured by theX22O7groups, giving rise to a three-dimensional framework with broad tunnels, running along thea- andc-axis directions, in which the Na+ions reside. The two Co2+cations, theX1 site and three of the seven O atoms lie on special positions, with site symmetries 2 andmfor the Co,mfor theX1, and 2 andm(× 2) for the O sites. One of two Na atoms is disordered over three special positions [occupancy ratios 0.877 (10):0.110 (13):0.066 (9)] and the other is in a general position with full occupancy. A comparison between structures such as K2CdP2O7, α-NaTiP2O7and K2MoO2P2O7is made. The proposed structural model is supported by charge-distribution (CHARDI) analysis and bond-valence-sum (BVS) calculations. The distortion of the coordination polyhedra is analyzed by means of the effective coordination number.

scholarly journals Crystal structure of strontium dinickel iron orthophosphate

2015 ◽  
Vol 71 (10) ◽  
pp. 1255-1258 ◽  
Author(s):  
Said Ouaatta ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
Lahcen El Ammari
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Reaction ◽  
Title Compound ◽  
Three Dimensional ◽  
The Other ◽  
Asymmetric Unit ◽  
Space Group ◽  
Edge Sharing Octahedra ◽  
Wyckoff Position

The title compound, SrNi2Fe(PO4)3, synthesized by solid-state reaction, crystallizes in an ordered variant of the α-CrPO4structure. In the asymmetric unit, two O atoms are in general positions, whereas all others atoms are in special positions of the space groupImma: the Sr cation and one P atom occupy the Wyckoff position 4e(mm2), Fe is on 4b(2/m), Ni and the other P atom are on 8g(2), one O atom is on 8h(m) and the other on 8i(m). The three-dimensional framework of the crystal structure is built up by [PO4] tetrahedra, [FeO6] octahedra and [Ni2O10] dimers of edge-sharing octahedra, linked through common corners or edges. This structure comprises two types of layers stacked alternately along the [100] direction. The first layer is formed by edge-sharing octahedra ([Ni2O10] dimer) linked to [PO4] tetrahedraviacommon edges while the second layer is built up from a strontium row followed by infinite chains of alternating [PO4] tetrahedra and FeO6octahedra sharing apices. The layers are held together through vertices of [PO4] tetrahedra and [FeO6] octahedra, leading to the appearance of two types of tunnels parallel to thea- andb-axis directions in which the Sr cations are located. Each Sr cation is surrounded by eight O atoms.

scholarly journals Crystal structure of TiBi2

2016 ◽  
Vol 72 (9) ◽  
pp. 1254-1256 ◽  
Author(s):  
Kei Watanabe ◽  
Hisanori Yamane
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Title Compound ◽  
The Other ◽  
Slow Cooling ◽  
Axis Direction

Black granular single crystals of monotitanium dibismuth, TiBi2, were synthesized by slow cooling of a mixture of Bi and Ti from 693 K. The title compound is isostructural with CuMg2(orthorhombicFdddsymmetry). Ti atoms are located in square antiprisms of Bi atoms. The network of one type of Bi atom spirals along thea-axis direction while honeycomb layers of the other type of Bi atom spreading in theabplane interlace one another.

The Silver(I) Mercury(II) Oxide Nitrate with the Empirical Formula AgHg2NO5

1999 ◽  
Vol 54 (12) ◽  
pp. 1489-1494 ◽  
Author(s):  
Thomas J. Mormann ◽  
Wolfgang Jeitschko
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystal ◽  
Solid State Reaction ◽  
Title Compound ◽  
Empirical Formula ◽  
Variable Parameters ◽  
Structure Factors ◽  
Linear Coordination ◽  
Oxygen Atoms

The title compound was prepared by solid state reaction of Ag2O with Hg(NO3)2· H2O in air at 350 °C. Its crystal structure was determined from single-crystal diffractometer data: Pnma, a = 620.1(1) pm, b = 670.1(1) pm, c = 1267.5(2) pm, Z = 4, R = 0.026 for 586 structure factors and 33 variable parameters. The compound may be represented by the formula Ag(HgO)2NO3 . The mercury(II) together with the oxygen atoms form zig-zag chains with linear coordination of the mercury atoms. The oxygen atoms of these chains are linked via silver(I) atoms, thus forming two-dimensionally infinite nets, which contain the trigonal planar nitrate groups in interstices. Thus, only secondary Hg-O and Ag-O bond are formed between the nets.

scholarly journals Crystal structure of poly[[(2,2′-bipyridine)manganese(II)]-di-μ-thiocyanato]

2014 ◽  
Vol 70 (12) ◽  
pp. m401-m402
Author(s):  
Stefan Suckert ◽  
Susanne Wöhlert ◽  
Inke Jess ◽  
Christian Näther
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
General Position ◽  
Rotation Axis ◽  
The Other ◽  
Asymmetric Unit ◽  
Thiocyanate Anion ◽  
Manganese Cation ◽  
Bipyridine Ligand

In the crystal structure of the polymeric title compound, [Mn(NCS)2(C10H8N2)]n, the MnIIcations are coordinated by one chelating 2,2′-bipyridine ligand and four thiocyanate anions (twoN- and twoS-coordinating), forming a distorted [MnN4S2] octahedron. The asymmetric unit consists of one manganese cation located on a twofold rotation axis and half of a 2,2′-bipyridine ligand, the other half being generated by the same twofold rotation axis, as well as one thiocyanate anion in a general position. The MnIIcations are linked by two pairs of μ1,3-bridging thiocyanate ligands into chains along thecaxis; because the N atoms of the 2,2′-bipyridine ligands, as well as the N and the S atoms of the thiocyanate anions, are eachcis-coordinating, these chains show a zigzag arrangement.

scholarly journals Crystal structure of 2-isopropyl-5,7′-dimethyl-1′,3′,3a',6′,8a',8b'-hexahydrospiro[cyclohexane-1,6′-furo[3,4-d]imidazo[1,5-b]isoxazol]-8′(7′H)-one

2016 ◽  
Vol 72 (8) ◽  
pp. 1150-1152
Author(s):  
Heithem Abda ◽  
Khaireddine Ezzayani ◽  
Kaiss Aouadi ◽  
Taha Guerfel ◽  
Sebastien Vidal ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
The Other ◽  
Axis Direction ◽  
Envelope Conformation ◽  
Compound C ◽  
The Mean

In the title compound, C17H28N2O3, the isoxazolidine ring adopts an envelope conformation with the O atom deviating from the mean plane of the other four ring atoms by 0.617 (1) Å. In the crystal, molecules are linkedviaweak C—H...O hydrogen bonds, forming chains which extend along theb-axis direction.

scholarly journals Crystal structure of bis[dihydrobis(pyrazol-1-yl)borato-κ2 N 2,N 2′](1,10-phenanthroline-κ2 N,N′)zinc(II)

2019 ◽  
Vol 75 (8) ◽  
pp. 1112-1116 ◽  
Author(s):  
Sascha Ossinger ◽  
Christian Näther ◽  
Felix Tuczek
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
General Position ◽  
The Other ◽  
Site Symmetry ◽  
Asymmetric Unit ◽  
Cation Site ◽  
Rotation Symmetry ◽  
Phenanthroline Ligand ◽  
Phenanthroline Ligands

The asymmetric unit of the title compound, [Zn(C6H8N4B)2(C12H8N2)], comprises one half of a ZnII cation (site symmetry 2), one dihydrobis(pyrazol-1-yl)borate ligand in a general position, and one half of a phenanthroline ligand, the other half being completed by twofold rotation symmetry. The ZnII cation is coordinated in form of a slightly distorted octahedron by the N atoms of a phenanthroline ligand and by two pairs of N atoms of symmetry-related dihydrobis(pyrazol-1-yl)borate ligands. The discrete complexes are arranged into columns that elongate in the c-axis direction with a parallel alignment of the phenanthroline ligands, indicating weak π–π interactions.

scholarly journals Crystal structure of strontium dicobalt iron(III) tris(orthophosphate): SrCo2Fe(PO4)3

2016 ◽  
Vol 72 (8) ◽  
pp. 1143-1146 ◽  
Author(s):  
Adam Bouraima ◽  
Thomas Makani ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
Lahcen El Ammari
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Reaction ◽  
Title Compound ◽  
Three Dimensional ◽  
Type Structure ◽  
Zigzag Chain ◽  
Common Edge ◽  
Linear Chains ◽  
Dimensional Network

The title compound, SrCo2Fe(PO4)3, has been synthesized by a solid-state reaction. It crystallizes with the α-CrPO4type structure. In this structure, all atoms are on special positions of theImmaspace group, except for two O atoms which are located on general positions. The three-dimensional network in the crystal structure is made up of two types of layers stacked normal to (100). The first layer is built from two edge-sharing CoO6octahedra, leading to the formation of Co2O10dimers that are connected to two PO4tetrahedra by a common edge and corners. The second layer results from apex-sharing FeO6octahedra and PO4tetrahedra, which form linear chains alternating with a zigzag chain of SrIIcations. These layers are linked together by common vertices of PO4tetrahedra and FeO6octahedra to form an open three-dimensional framework that delimits two types of channels parallel to [100] and [010] where the SrIIcations are located. Each SrIIcation is surrounded by eight O atoms.

scholarly journals New mixed aluminium–chromium diarsenate

2017 ◽  
Vol 73 (3) ◽  
pp. 345-348 ◽  
Author(s):  
Mohamad Alem Bouhassine ◽  
Habib Boughzala
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Alkali Metal ◽  
Solid State Reaction ◽  
Three Dimensional ◽  
Axis Direction ◽  
Anionic Framework

Potassium chromium aluminium diarsenate, KCr1/4Al3/4As2O7, was prepared by solid-state reaction. The structure consists of (Cr1/4/Al3/4)O6octahedra and As2O7diarsenate groups sharing corners to build up a three-dimensional anionic framework. The potassium cations are located in wide channels running along thec-axis direction. The crystal structure is isostructural with the triclinicAIMIIIX2O7(AI= alkali metal;MIII= Al, Cr, Fe;X= As, P) compounds. However, theMIIIoctahedrally coordinated site is 25% partially occupied by chromium and 75% by aluminium.

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