A trigonal prismatic vanadium(IV) complex: bis(acetylacetone benzoylhydrazonato)vanadium(IV); X-ray crystal structure

1976 ◽  
pp. 264 ◽  
Author(s):  
Alex A. Diamantis ◽  
Michael R. Snow ◽  
John A. Vanzo
Keyword(s):  
Crystal Structure ◽  
X Ray ◽  
Trigonal Prismatic

Preparation and Structure of Bis-μ-(Benzene-1,2-Dithiolato)-bis[(benzene-1,2-dithiolato)-technetium( IV)]-Chloroform (1:1)

1988 ◽  
Vol 41 (2) ◽  
pp. 269 ◽  
Author(s):  
SF Colmanet ◽  
MF Mackay
Keyword(s):  
Crystal Structure ◽  
Bond Length ◽  
Title Compound ◽  
Binuclear Complex ◽  
Aqueous Alcohol ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Sulfur Ligand ◽  
Trigonal Prismatic

After reaction of benzene-1,2-dithiol (bdtH2) with ammonium [99Tc] pertechnetate in aqueous alcohol, extraction of the reaction mixture with chloroform yielded wine-red crystals of the title compound, C24H16S8Tc2.CHCl3. The crystal structure of the binuclear complex has been determined by X-ray diffraction. Crystals are triclinic and belong to the space group Pī with a 8.534(1), b 8.842(2), c 11.192(3)Ǻ, α 107.02(2), β 98.13(1), γ 100.60(2)° with Z 1. Refinement on 1524 data measured with Cu Kα radiation converged at R 0.082. The complex has exact Ci point symmetry and pseudo-C2 symmetry. Each technetium atom is coordinated to a trigonal -prismatic array of six sulfur ligand atoms. These arrays are fused through a quadrilateral face defined by the four bridging sulfur atoms of two benzene-1,2- dithiolato ligands to give a Tc2S8 core of D2h pseudo-symmetry. As a Tc - Tc bond [bond length 2.591(3)Ǻ] passes through the mid point of the quadrilateral face, this novel geometry can be described in terms of capped trigonal prisms. The chloroform is disordered.

Crystal Structure of Tris(1,10-phenanthroline)mercury(II) Trifluoromethanesulfonate

1979 ◽  
Vol 32 (10) ◽  
pp. 2195 ◽  
Author(s):  
GB Deacon ◽  
CL Raston ◽  
D Tunaley ◽  
AH White
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Title Compound ◽  
Unit Cell Volume ◽  
Octahedral Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ethanol Solvate ◽  
The Mean ◽  
Trigonal Prismatic

The crystal structure of the ethanol solvate of the title compound, [Hg(phen)3](CF3S03)2 (phen =1,10-phenanthroline), has been determined at 295(1) K by single-crystal X-ray diffraction and refined by least squares to a residual of 0�043 for 2939 'observed' reflections. Crystals are monoclinic: C2/c, a 25�25(1), b 10�960(4), c 18�949(6) �, β 129�32(2)�, Z 4. The cation is centred on a crystallographictwofold axis and has approximate D3 point symmetry. The deviation of the mercury(II) environment from octahedral symmetry toward the trigonal-prismatic limit is considerable, the mean trans N-Hg-N angle being 154�52�. <Hg-N> is 2�400 �. The unit cell volume is considerablydependent on crystallization solvent, being larger for the ethanol solvate than for solvent-free crystals obtained from aqueous solution.

Zur Kristallstruktur von Sr6(CrO4)3Cl / On the Crystal Structure of Sr5(CrO4)3Cl

1978 ◽  
Vol 33 (7) ◽  
pp. 708-710 ◽  
Author(s):  
Hk. Müller-Buschbaum ◽  
K. Sander
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Coordination Sphere ◽  
Apatite Structure ◽  
X Ray ◽  
Lower Symmetry ◽  
Trigonal Prismatic

Abstract Single crystal X-ray investigation shows that Sr5(CrO4)3Cl is not isotypic with the apatite structure as being affirmed up to now. Chlorine occupies a position other than z = 0.250 implying the lower symmetry C66-P 63. As a consequence one strontium coordination sphere changes from octahedral to trigonal prismatic.

Pr2CBr: Ein Ferromagnet mit Pr2C-Schichten/ Pr2CBr: A Ferromagnet with Pr2C Layers

2009 ◽  
Vol 64 (4) ◽  
pp. 371-374 ◽  
Author(s):  
Hansjürgen Mattausch ◽  
Reinhard K. Kremer ◽  
Arndt Simon
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Phase ◽  
Single Crystal Diffraction ◽  
Space Group ◽  
Metallic Conductivity ◽  
X Ray ◽  
Trigonal Prismatic

Single-phase Pr2CBr was prepared by heating a mixture of PrBr3, Pr and C (1 : 5:3) to 1140 °C for 18 d. The crystal structure was investigated by X-ray single crystal diffraction (space group P63/mmc, a = 3.8071(3), c = 14.7787(12) Å). In the structure the Pr atoms form C-centered octahedra condensed into Pr2C sheets via common edges; these sheets are separated by the Br atoms which are in a trigonal prismatic environment of Pr atoms. Pr2CBr is a black shiny compound with metallic conductivity. It is a ferromagnet with Tc = 13.8(5) K.

Neue Strukturverfeinerung und Eigenschaften von Cr3C2/Structure Refinement and Properties of Cr3C2

2003 ◽  
Vol 58 (9) ◽  
pp. 929-933 ◽  
Author(s):  
Jochen Glaser ◽  
Ruth Schmitt ◽  
H.-Jürgen Meyer
Keyword(s):  
Crystal Structure ◽  
Electronic Structure ◽  
Single Crystal ◽  
Structure Refinement ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Metal Atoms ◽  
Extended Hückel Calculations ◽  
Trigonal Prismatic

Cr3C2 was obtained from arc-melting of pellets made of carbon and chromium. The structure of Cr3C2 was determined by single crystal X-ray diffraction (Pnma, Z = 4, a = 553.99(6), b = 283.27(4), c = 1149.4(1) pm, R1 = 0.019 and wR2 = 0.037 for all collected reflections). The crystal structure contains isolated carbon atoms which reside inside of trigonal prismatic voids of metal atoms. The compound exhibits temperature independent paramagnetism. The electronic structure of Cr3C2 has been investigated using extended Hückel calculations.

Synthesis, crystal structure and magnetic properties of an octanuclear cerium(III) complex of pyridine-2,6-dicarboxylate

2019 ◽  
Vol 74 (3) ◽  
pp. 255-260
Author(s):  
Shahzad Sharif ◽  
Islam Ullah Khan ◽  
Onur Sahin ◽  
Nadia Jabeen ◽  
Saeed Ahmad ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Exchange Coupling ◽  
Magnetic Behavior ◽  
Supramolecular Network ◽  
X Ray Diffraction ◽  
Coordination Polyhedra ◽  
X Ray ◽  
Solvothermal Conditions ◽  
Trigonal Prismatic ◽  
Cerium Atom

AbstractAn octanuclear compound of cerium(III), [Ce8(Pydc)10(HPydc)4.22H2O].11H2O (1) (Pydc=pyridine-2,6-dicarboxylate anion) was prepared under mild solvothermal conditions and its crystal structure was determined by single-crystal X-ray diffraction. Three kinds of coordination environments are observed, which include: [Ce(Pydc)3], [Ce(Pydc)(H2O)4(O,O)], and [Ce(H2O)7(O,O)]. Each cerium atom in 1 is nine-coordinated but two different geometries are found. The Ce1 and Ce2 atoms exhibit a nearly tricapped trigonal prismatic CeN3O6 geometry, while Ce3 and Ce4 possess CeNO8 and CeO9 coordination polyhedra, which approximate to slightly distorted mono-capped square antiprisms having 12 triangular faces. The Pydc ligands adopt tri-, tetra-, and penta-coordination modes through tridentate chelating and, μ2 and μ3-bridging modes, respectively. The clusters are joined by O–H···O hydrogen bonds to generate 3D supramolecular network. Magnetic susceptibility measurements for 1 indicate that the χm values obey the Curie-Weiss law. The overall magnetic behavior is typical for the presence of antiferromagnetic exchange coupling interactions between the cerium(III) ions.

Zur Kristallchemie der Oxoplatinate. Eine neue Phase der Zusammensetzung Sr4-ϰNaϰPtO6 (ϰ = 0,33) / On the Crystal Chemistry of Oxoplatinates. A New Phase of the Composition Sr4-ϰNaϰPtO6 (ϰ = 0,33)

1994 ◽  
Vol 49 (5) ◽  
pp. 581-584 ◽  
Author(s):  
G. Tams ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Space Group ◽  
X Ray ◽  
Group D ◽  
Related Compounds ◽  
New Phase ◽  
Trigonal Prismatic

Single crystals of Sr3.67Na0.33PtO6 were prepared by heating oxide mixtures in closed silver tubes and investigated by X-ray single crystal techniques. It crystallizes with trigonal symme­try, space group D63d-R3̅c (Nr. 167) with a = 9.6617, c = 11.6580 Å, Z = 6. Sr3.67Na0.33PtO6 belongs to the Sr4PtO6 type and is isotypic to K4CdCl6. One point position characterized by a trigonal prismatic O2- coordination is occupied by Na+ and Sr2+ statistically. The crystal structure is discussed with respect to the related compounds Sr3CuPtO6 and Ca3. 5Cu0.5PtO6.

Oxidfluoridsulfide der Lanthanoide vom Formeltyp M3OF5S (M = Nd, Sm, Gd–Ho) / Oxide Fluoride Sulfides of the Lanthanoids with the Formula M3OF5S (M = Nd, Sm, Gd–Ho)

2011 ◽  
Vol 66 (3) ◽  
pp. 213-220
Author(s):  
Hagen Grossholz ◽  
Oliver Janka ◽  
Thomas Schleid
Keyword(s):  
Crystal Structure ◽  
Electron Beam ◽  
Single Crystal ◽  
The Other ◽  
Molar Ratio ◽  
Hexagonal Crystal Structure ◽  
Hexagonal Crystal ◽  
X Ray ◽  
Phase Pure ◽  
Trigonal Prismatic

First attempts to synthesize a lanthanoid(III) oxide fluoride sulfide were successful by reacting DyF3 and Dy2O3 with dysprosium and sulfur in a 2 : 5 : 1 : 3 molar ratio at 850 ◦C in tightly sealed tantalum ampoules. In analogy to the dysprosium compound Dy3OF5S, the other representatives of the M3OF5S series with M = Nd, Sm, Gd-Ho could be prepared as well. Almost phase-pure samples were obtained under similar flux-assisted (NaCl) conditions according to 2M +5MF3 +M2O3 + 3S →3M3OF5S. In the hexagonal crystal structure (space group: P63/m; a ≈ 961 - 939 pm, c ≈ 378 - 367 pm; c/a≈0.39,Vm ≈91 - 84 cm3 mol−1, Z = 2), the M3+ cations reside in ninefold anionic coordination realized as tricapped trigonal prisms formed by seven light (O2−/F−) and two heavier S2− anions. One light-anion position exhibits the exclusive character of F− in trigonal non-planar coordination (CN = 3), while the other position with a tetrahedral cationic environment (CN = 4) is mixed occupied by F− and O2− in a 2 : 1 ratio. The S2− anions are coordinated in a trigonal prismatic way by six M3+ cations. From the data of single-crystal X-ray structure analyses, no indication of any ordering for the O2− and F− anions could be obtained, but bond-valence and MAPLE calculations confirmed the results of electron-beam microanalyses carried out earlier to reveal ordered models for Dy3OF5S.

YIrIn with ZrNiAl-type structure

2020 ◽  
Vol 75 (12) ◽  
pp. 1075-1077
Author(s):  
Nataliya L. Gulay ◽  
Yaroslav M. Kalychak ◽  
Rainer Pöttgen
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
High Frequency ◽  
Small Degree ◽  
Type Structure ◽  
X Ray ◽  
Trigonal Prismatic Coordination ◽  
Trigonal Prismatic

AbstractThe indide YIrIn was synthesized from the elements in a sealed tantalum ampoule in a high-frequency furnace. YIrIn adopts the ZrNiAl type. The crystal structure was refined from single-crystal X-ray diffractometer data: P6–2m, a = 750.63(6), c = 392.04(3) pm, wR = 0.0346, 308 F2 values and 16 variables. Refinement of the occupancy parameters revealed a small degree of Ir/In mixing (0.912(9) Ir2/0.088(9) In1) on the 2d site. The YIrIn structure contains two crystallographically independent iridium sites, both with tri-capped trigonal prismatic coordination: Ir1@In6Y3 and Ir2@In3Y6.

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