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 Elaboration, structural study and validation of a new NASICON-type structure, Na0.72(Cr0.48,Al1.52)(Mo2.77,Al0.23)O12

2018 ◽  
Vol 74 (3) ◽  
pp. 406-409
Author(s):  
Manel Sonni ◽  
Imen Jendoubi ◽  
Mohamed Faouzi Zid
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Structural Study ◽  
Solid State Reaction ◽  
Title Compound ◽  
Structural Model ◽  
Three Dimensional ◽  
Type Structure ◽  
Sodium Cations ◽  
Nasicon Type

The title compound, sodium chromium/aluminium molybdenum/aluminium dodecaoxide, Na0.72Cr0.48Al1.74Mo2.77O12, was prepared by solid-state reaction. Its crystal structure is related to NaSICON-type compounds. The framework is built up fromM1O6(M1 = Cr/Al) octahedra andM2O4(M2 = Mo/Al) tetrahedra interconnected by corners. The three-dimensional framework contains cavities in which sodium cations are located. Two validation models (BVS and CHARDI) were used to confirm the proposed structural model. The mobility of Na+ions in the structure has been investigated by theoretical means.

Tetrakis(phenylethynyl)tin(IV)

2007 ◽  
Vol 63 (11) ◽  
pp. m2762-m2762 ◽  
Author(s):  
Mohammed Lahcini ◽  
Minna T. Räisänen ◽  
Pascal M. Castro ◽  
Martti Klinga ◽  
Markku Leskelä
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Title Compound ◽  
Triple Bond ◽  
Three Dimensional ◽  
Asymmetric Unit ◽  
Tetrahedral Symmetry ◽  
Acetylenic Bond ◽  
Dimensional Network ◽  
Phenyl Proton

The asymmetric unit of the crystal structure of the title compound, [Sn(C8H5)4], consists of one fourth of a discrete tin complex and one half of another which both possess nearly ideal tetrahedral symmetry; the site symmetries of the two Sn atoms are \overline4 and 2. The bond angles at all acetylide C atoms are almost linear. The Sn—C distances [2.076 (6) and 2.065 (6)–2.069 (6) Å in the two complexes) are short when compared to the sum of the covalent radii of C and Sn (2.177 Å), but consistent with another tetrakis(alkynyl)tin complex. The acetylenic bond distances [1.196 (7) and 1.183 (7)–1.207 (7) Å] are consistent with a triple C[triple-bond]C bond. Therefore, despite the short Sn—C distances, the ligands are mainly σ-bonded to the metal. In the solid state, these complexes form a three-dimensional network via agostic C—H interactions as a phenyl proton in the ortho position interacts with the acetylenic carbon in the α position to the tin center.

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 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 Synthesis and crystal structure of calcium dizinc iron(III) tris(orthophosphate), CaZn2Fe(PO4)3

2016 ◽  
Vol 72 (9) ◽  
pp. 1260-1262 ◽  
Author(s):  
Jamal Khmiyas ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
Lahcen El Ammari
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reaction ◽  
Three Dimensional ◽  
Asymmetric Unit ◽  
Common Edge ◽  
Conventional Solid State Reaction ◽  
Synthesis And Crystal Structure ◽  
A Chain

Single crystals of the title compound, CaZn2Fe(PO4)3, were synthesized by conventional solid-state reaction. In the asymmetric unit, all atoms are located in fully occupied general positions of theP21/cspace group. The zinc atoms are located on two crystallographically independent sites with tetrahedral and distorted triangular-based bipyramidal geometries. Two edge-sharing triangular bipyramidal ZnO5units form a dimer, which is linked to slightly deformed FeO6octahedraviaa common edge. The resulting chains are interconnected through PO4tetrahedra to form a layer perpendicular to thebaxis. Moreover, the remaining PO4and ZnO4tetrahedra are linked together through common vertices to form tapes parallel to thecaxis and surrounding a chain of Ca2+cations to build a sheet, also perpendicular to thebaxis. The stacking of the two layers along thebaxis leads to the resulting three-dimensional framework, which defines channels in which the Ca2+cations are located, each cation being coordinated by seven oxygen atoms.

scholarly journals Ca5Zr3F22

2012 ◽  
Vol 68 (4) ◽  
pp. i23-i23 ◽  
Author(s):  
Abdelghani Oudahmane ◽  
Malika El-Ghozzi ◽  
Daniel Avignant
Keyword(s):  
Solid State ◽  
Single Crystals ◽  
Solid State Reaction ◽  
Title Compound ◽  
Three Dimensional ◽  
The Other ◽  
Site Symmetry ◽  
Coordination Numbers ◽  
Rotation Axes ◽  
Dimensional Network

Single crystals of Ca5Zr3F22, pentacalcium trizirconium docosafluoride, were obtained unexpectedly by solid-state reaction between CaF2and ZrF4in the presence of AgF. The structure of the title compound is isotypic with that of Sr5Zr3F22and can be described as being composed of layers with composition [Zr3F20]8−made up from two different [ZrF8]4−square antiprisms (one with site symmetry 2) by corner-sharing. The layers extending parallel to the (001) plane are further linked by Ca2+cations, forming a three-dimensional network. Amongst the four crystallographically different Ca2+ions, three are located on twofold rotation axes. The Ca2+ions exhibit coordination numbers ranging from 8 to 12, depending on the cut off, with very distorted fluorine environments. Two of the Ca2+ions occupy interstices between the layers whereas the other two are located in void spaces of the [Zr3F20]8−layer and alternate with the two Zr atoms along [010]. The crystal under investigation was an inversion twin.

scholarly journals Crystal structure of calcium dinickel(II) iron(III) tris(orthophosphate): CaNi2Fe(PO4)3

2017 ◽  
Vol 73 (6) ◽  
pp. 893-895
Author(s):  
Said Ouaatta ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
Lahcen El Ammari
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Title Compound ◽  
Linear Chain ◽  
Three Dimensional ◽  
Solid State Reactions ◽  
Common Edge ◽  
Space Group ◽  
Infinite Linear

The title compound, CaNi2Fe(PO4)3, was synthesized by solid-state reactions. Its structure is closely related to that of α-CrPO4in the space groupImma. Except for two O atoms in general positions, all atoms are located in special positions. The three-dimensional framework is built up from two types of sheets extending parallel to (100). The first sheet is made up from two edge-sharing [NiO6] octahedra, leading to the formation of [Ni2O10] double octahedra that are connected to two PO4tetrahedra through a common edge and corners. The second sheet results from rows of corner-sharing [FeO6] octahedra and PO4tetrahedra forming an infinite linear chain. These layers are linked together through common corners of PO4tetrahedra and [FeO6] octahedra, resulting in an open three-dimensional framework that delimits two types of channels parallel to [100] and [010] in which the eightfold-coordinated CaIIcations are located.

scholarly journals Crystal structure of disilver(I) dizinc(II) iron(III) tris(orthovanadate) with an alluaudite-type structure

2018 ◽  
Vol 74 (8) ◽  
pp. 1155-1158 ◽  
Author(s):  
Nour El Houda Lamsakhar ◽  
Mohammed Zriouil ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
Lahcen El Ammari
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Title Compound ◽  
General Position ◽  
Three Dimensional ◽  
Type Structure ◽  
Solid State Reactions ◽  
Framework Structure ◽  
Rotation Axes ◽  
Wyckoff Position

The title compound, Ag2Zn2Fe(VO4)3, has been synthesized by solid-state reactions and belongs to the alluaudite structure family. In the crystal structure, four sites are positioned at special positions. One silver site is located on an inversion centre (Wyckoff position 4b), and an additional silver site, as well as one zinc and one vanadium site, on twofold rotation axes (4e). One site on a general position is statistically occupied by FeIII and ZnII cations that are octahedrally surrounded by O atoms. The three-dimensional framework structure of the title vanadate results from [(Zn,Fe)2O10] units of edge-sharing [(Zn,Fe)O6] octahedra that alternate with [ZnO6] octahedra so as to form infinite chains parallel to [10\overline{1}]. These chains are linked through VO4 tetrahedra by sharing vertices, giving rise to layers extending parallel to (010). Such layers are shared by common vanadate tetrahedra. The resulting three-dimensional framework delimits two types of channels parallel to [001] in which the silver sites are located with four- and sixfold coordination by oxygen.

scholarly journals Crystal structure of 5-[(4-carboxybenzyl)oxy]isophthalic acid

2016 ◽  
Vol 72 (8) ◽  
pp. 1219-1222
Author(s):  
Md. Serajul Haque Faizi ◽  
Musheer Ahmad ◽  
Akram Ali ◽  
Vadim A. Potaskalov
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Compound ◽  
Three Dimensional ◽  
Molecular Shape ◽  
Isophthalic Acid ◽  
Compound C ◽  
Dimensional Network ◽  
Benzene Rings

The molecular shape of the title compound, C16H12O7, is bent around the central CH2—O bond. The two benzene rings are almost perpendicular to one another, making a dihedral angle of 87.78 (7)°. In the crystal, each molecule is linked to three others by three pairs of O—H...O hydrogen bonds, forming undulating sheets parallel to thebcplane and enclosingR22(8) ring motifs. The sheets are linked by C—H...O hydrogen bonds and C—H...π interactions, forming a three-dimensional network.

scholarly journals Crystal structure of 2-bromo-1,4-dihydroxy-9,10-anthraquinone

2014 ◽  
Vol 70 (10) ◽  
pp. o1130-o1130 ◽  
Author(s):  
Wataru Furukawa ◽  
Munenori Takehara ◽  
Yoshinori Inoue ◽  
Chitoshi Kitamura
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
Stacking Interactions ◽  
Compound C ◽  
Π Stacking ◽  
Dimensional Network

In an attempt to brominate 1,4-dipropoxy-9,10-anthraquinone, a mixture of products, including the title compound, C14H7BrO4, was obtained. The molecule is essentially planar (r.m.s. deviation = 0.029 Å) and two intramolecular O—H...O hydrogen bonds occur. In the crystal, the molecules are linked by weak C—H...O hydrogen bonds, Br...O contacts [3.240 (5) Å], and π–π stacking interactions [shortest centroid–centroid separation = 3.562 (4) Å], generating a three-dimensional network.

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