Distortions of the coordination polyhedron in high-spin manganese(III) complexes. 3. Crystal and molecular structure of .gamma.-tris(acetylacetonato)manganese(III): a tetragonally elongated octahedral form

1979 ◽  
Vol 18 (7) ◽  
pp. 1853-1858 ◽  
Author(s):  
B. Ray Stults ◽  
Robert S. Marianelli ◽  
Victor W. Day
Keyword(s):  
Molecular Structure ◽  
High Spin ◽  
Coordination Polyhedron ◽  
Crystal And Molecular Structure

The crystal structure of dibutyl-bis(pentamethylenedithiocarbamato)tin(IV)

1986 ◽  
Vol 51 (11) ◽  
pp. 2521-2527 ◽  
Author(s):  
Jan Lokaj ◽  
Eleonóra Kellö ◽  
Viktor Kettmann ◽  
Viktor Vrábel ◽  
Vladimír Rattay
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Least Squares ◽  
Coordination Polyhedron ◽  
Crystal And Molecular Structure ◽  
Distorted Octahedron ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray

The crystal and molecular structure of SnBu2(pmdtc)2 has been solved by X-ray diffraction methods and refined by a block-diagonal least-squares procedure to R = 0.083 for 895 observed reflections. Monoclinic, space group C2, a = 19.893(6), b = 7.773(8), c = 12.947(8) . 10-10 m, β = 129.07(5)°, Z = 2, C20H38N2S4Sn. Measured and calculated densities are Dm = 1.38(2), Dc = 1.36 Mg m-3. Sn atom, placed on the twofold axes, is coordinated with four S atoms in the distances Sn-S 2.966(6) and 2.476(3) . 10-10 m. Coordination polyhedron is a strongly distorted octahedron. Ligand S2CN is planar.

Metalltetrahydridoborate und Tetrahydridometallate, 11 [1] Zur Kristall- und Molekülstruktur von Magnesiumtetrahydridoborat Mg(BH4)2 • 3 THF / Metal Tetrahydridoborates and Tetrahydridoborato Metallates, 11 [1] The Crystal and Molecular Structure of Magnesium Tetrahydridoborate Mg(BH4)2 • 3 THF

1982 ◽  
Vol 37 (12) ◽  
pp. 1499-1503 ◽  
Author(s):  
Heinrich Nöth
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Oxygen Atom ◽  
Coordination Polyhedron ◽  
Crystal And Molecular Structure ◽  
Equatorial Position ◽  
Crystallographic Axis ◽  
Space Group ◽  
Distorted Trigonal Bipyramid ◽  
Double Hydrogen

Mg(BH4)2 • 3 THF was prepared from MgHo and B2H6 in tetrahydrofuran. It crystallizes monoclinically, space group C2/c, Z = 4. The crystal structure reveals that the molecule contains a seven-coordinate Mg center. Its BH4 groups form double hydrogen bridges to magnesium. The geometry at Mg corresponds to a slightly distorted trigonal bipyramid for the O 3 B 2 (Mg)-coordination polyhedron, with two THF molecules in apical and one in equatorial position. A two-fold crystallographic axis passes through Mg and the equatorial oxygen atom thus posing C2 symmetry on the molecule

Kristall- und Molekülstruktur des Chlorodinitrosyltriphenylphosphineisens(-I) / Crystal and Molecular Structure of Chlorodinitrosyltriphenylphosphineiron(-I)

1975 ◽  
Vol 30 (3-4) ◽  
pp. 149-154 ◽  
Author(s):  
Jürgen Kopf ◽  
Jörn Schmidt
Keyword(s):  
Molecular Structure ◽  
Electronic Structure ◽  
Coordination Polyhedron ◽  
Crystal And Molecular Structure ◽  
Three Dimensional ◽  
Unit Cell ◽  
Mirror Plane ◽  
Fourier Methods ◽  
Trigonal Pyramid ◽  
Dinitrosyl Complexes

Crystals of [Fe(NO)2PØ3Cl] are monoclinic with a = 1.6265(7) [nm], b = 1.4495(7) [nm], c = 1.5609(6) [nm] and β= 96.86(2) deg.; the space group is C 2/c. The structure was determined by three dimensional Patterson and Fourier methods on the basis of 2266 independent intensities. The unit cell consists of 8 isolated molecules. Within the coordination polyhedron, a distorted trigonal pyramid, the Cl, Fe, P plane approximately represents a mirror plane of the molecule. The nitrosyl ligands are bent towards each other with an N-Fe-N angle of 115.6(3) and Fe-N-O angles of 166.4(5) and 165.5(5) deg. The geometry of the molecule is discussed with regard to other dinitrosyl complexes and to electronic structure.

The crystal and molecular structure of the bis(thiocyanato)-bis(4-methylpyridine)copper(II) complex at 180 K

1990 ◽  
Vol 55 (5) ◽  
pp. 1184-1192 ◽  
Author(s):  
Mária Kabešová ◽  
Zlatica Kožíšková ◽  
Michal Dunaj-Jurčo
Keyword(s):  
Molecular Structure ◽  
Coordination Polyhedron ◽  
Crystal And Molecular Structure ◽  
Central Atom ◽  
Elementary Cell ◽  
Heterocyclic Ligands ◽  
Monoclinic System ◽  
Coordination Polyhedra ◽  
Cell Parameters ◽  
Thermal Stability Of

At 180 K, [Cu(4-Mepy)2(NCS)2] crystallizes in the monoclinic system, space group P21, Z = 6, with the elementary cell parameters a = 0.963(1), b = 2.653(2), c = 0.984(2) nm, β = 106.40(0.07)°. The central atom possesses the tetragonal bipyramidal coordination; the heterocyclic ligands are bonded in the equatorial plane of the coordination polyhedron in the trans positions, the thiocyanate ligands are bridge ones and are coordinated in both the equatorial and axial positions of the coordination polyhedron. The crystal structure involves three symmetrically independent coordination polyhedra differing in the degree of axial distortion. The thermal stability of the thiocyanate ligands in the complex is related with the steric arrangement of the thiocyanatocopper(II) chains.

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