Ligand displacement reactions from the coordination sphere of cobalt complexes. Part II: The displacement of ligands of [cis-Co(en)2Cl2]Cl by potassium squarate. The crystal and molecular structure of a compound with idealized formula of [cis-Co(en)2(H2O)Br]2[trans-(C2O4 2−(C2O4H−)Co-trans-(H2O)2(OH)2]Br2 (I)

1996 ◽  
Vol 7 (3) ◽  
pp. 233-240
Author(s):  
Jiwen Cai ◽  
Ivan Bernal ◽  
Frank Fronczek ◽  
Steven F. Watkins
Keyword(s):  
Molecular Structure ◽  
Coordination Sphere ◽  
Crystal And Molecular Structure ◽  
Cobalt Complexes ◽  
Ligand Displacement ◽  
Displacement Reactions

The Crystal and Molecular Structure of (μ-Oxo)bis{chloro(methyl)thienyl- tellurium(IV)}

2001 ◽  
Vol 56 (2) ◽  
pp. 215-218 ◽  
Author(s):  
Raija Oilunkaniemi ◽  
Risto S. Laitinen ◽  
Markku Ahlgrén
Keyword(s):  
Molecular Structure ◽  
Coordination Sphere ◽  
Crystal And Molecular Structure ◽  
Tellurium Atom ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Regular Octahedron ◽  
Oxygen Atoms

Abstract The formation and the crystal and molecular structure of (μ-oxo)bis{chloro(methyl)thienyl-tellurium(IV)}, [Me(Th)TeCl]20 , are described. The compound is orthorhombic, space group Pbcn, a = 1893.30(2), b = 891.96(2), c = 966.24(5) pm; Z =4. The tellurium atom shows trigonal bi-pyramidal coordination with chlorine and the bridging oxygen atoms in axial, and methyl and thienyl groups in equatorial positions. The two close intermolecular Te(1) ···Cl(1) contacts ex­pand the coordination sphere around tellurium to an almost regular octahedron.

The Crystal and Molecular structure of trans-Dichlorobis(1,3-Diaminopropan-2-ol)cobalt(III) Chloride

1987 ◽  
Vol 40 (10) ◽  
pp. 1763
Author(s):  
R Kivekas ◽  
MR Sundberg
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bonding ◽  
Coordination Sphere ◽  
Structure Determination ◽  
Title Compound ◽  
Crystal And Molecular Structure ◽  
Chloride Ions ◽  
X Ray ◽  
R Value

A single-crystal X-ray structure determination of the title compound is reported. The compound crystallizes in the space group P1 with a 7.273(1), b 8.525(2), c 12.358(3) �, α 80.03(3),β 75.38(2), γ 65.06(2)� and Z 2. The final R value for 3318 reflections was 0.041. The structure consists of two independent trans- dichlorobis (l,3-diaminopropan-2-ol)cobalt(III) cations and chloride ions interconnected by a hydrogen bonding network. The axial Co-Cl bonds in the pseudo-octahedral coordination sphere are shorter than those in the coordination sphere of the copper(II) analogue. The compression is clearly related to the simultaneous flattening of the rings.

The crystal and molecular structure of the coordinatively unsaturated Ni(0) species Ni(PPh3)3

1990 ◽  
Vol 68 (4) ◽  
pp. 628-632 ◽  
Author(s):  
David G. Dick ◽  
Douglas W. Stephan ◽  
Charles F. Campana
Keyword(s):  
Molecular Structure ◽  
Least Squares ◽  
Coordination Sphere ◽  
Crystal And Molecular Structure ◽  
Close Approach ◽  
Structural Data ◽  
Triclinic Space Group ◽  
Full Matrix ◽  
Independent Molecules ◽  
Phosphine Complex

The disproportionation of the complex (Et2N)3Ti(μ-PCy2)Ni(PPh3) affords the coordinatively unsaturated species Ni(PPh3)3, 1. This compound crystallizes in the triclinic space group [Formula: see text], with a = 18.483(4) Å, b = 16.203(3) Å, c = 17.783(4) Å, α = 105.85(2)°, β = 117.33(3)°, γ = 92.33(3)°, Z = 4, and V = 4464(2) Å3. Full-matrix least-squares refinement of 1042 variables using 6484 data (Fo2 > 3σFo2) gave R = 0.0441 and Rw = 0.0438. The two crystallographically independent molecules are essentially identical, each exhibiting a trigonal planar coordination sphere at Ni. The most interesting feature of the structure is the close approach (2.744–3.094 Å) of three ortho hydrogens of the PPh3 groups to the Ni centres. The implications of the structural data regarding ortho metallation and the known instability of 1 are discussed. Keywords: coordinatively unsaturated, nickel phosphine complex.

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