Surprise! It’s a hexagonal planar complex

2019 ◽  
Vol 97 (40) ◽  
pp. 9-9
Keyword(s):  
Planar Complex

Oxamide Oxime Complexes: The Structure of the Complex Bis ( oxamide - oximato )nickel( II) - Hydrogen Chloride - Water, and the Characterization of the Analogous Platinum(II) Complex

1982 ◽  
Vol 37 (6) ◽  
pp. 702-706 ◽  
Author(s):  
Helmut Entires
Keyword(s):  
Hydrogen Chloride ◽  
Structure Determination ◽  
Columnar Structure ◽  
Orthorhombic Symmetry ◽  
Complete Structure ◽  
Complex Molecules ◽  
Planar Complex ◽  
Pt Complex ◽  
Chloride Water

Abstract[Ni(C2H5N4O2)2] · HCl · H2O, C4H10N8NiO4 · HCl · H2O, forms triclinic crystals, Mr = 347.36, P1̄, a = 7.219(2), b = 7.316(1), c = 11.797(3) Å, α = 73.89(2), β = 86.37(2), γ = 85.71(2)°, V = 596 Å3 , Z = 2, dc = 1.93 Mgm-3 ; final Rw = 0.028 for 1957 reflections. The planar complex molecules form equidistant stacks along b, with the molecular planes inclined at ~29° to the stacking axis. Molecules of adjacent stacks are linked along a by an intermolecular H bridge coexistins with the usual intramolecular H bridges. The analogous Pt complex, C4H10N8O4Pt · HCl · H2O, Mr = 483.74, a = 6.480(4), b = 16.115(5), c = 12.194(9) Å, β = 101.27(4)°, V = 1249 Å3 , Z = 4, dc = 2.57 Mgm-3 , P21/a, crystallizes in a columnar structure with a Pt-Pt separation of ~a/2 ≈ 3.24 Å. Due to twinning, faking orthorhombic symmetry, a complete structure determination was not possible.

Metal Phenoxyalkanoic Acid Interactions. XXV. The Crystal Structures of (2-Formyl-6-Methoxyphenoxy)Acetic Acid and Its Zinc(II) Complex and the Lithium, Zinc(II) and Cadmium(II) Complexes of (2-Chlorophenoxy)Acetic Acid

1987 ◽  
Vol 40 (7) ◽  
pp. 1147 ◽  
Author(s):  
EJ Oreilly ◽  
G Smith ◽  
CHL Kennard ◽  
TCW Mak
Keyword(s):  
Acetic Acid ◽  
Crystal Structures ◽  
Free Acid ◽  
Rotational Symmetry ◽  
Carboxyl Groups ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Third ◽  
Planar Complex ◽  
Hydrogen Bonded

The crystal structures of (2-formyl-6-methoxyphenoxy)acetic acid (1), diaquabis [(2-formyl-6-methoxyphenoxy) acetato ]zinc(11) (2), tetraaquabis [(2-chlorophenoxy) acetato ]zinc(11) (3), triaquabis [(2-chlorophenoxy) acetato ]cadmium(11) dihydrate (4) and lithium (2-chloro- phenoxy )acetate 1.5 hydrate (5) have been determined by X-ray diffraction. The acid (1) forms centrosymmetric hydrogen-bonded cyclic dimers [O…0, 2.677(6) �] which are non-planar. Complex (2) is six-coordinate with two waters [Zn- Ow , 1.997(2) �] and four oxygens from two asymmetric bidentate carboxyl groups [Zn-O, 2.073, 2.381(2) �] completing a skew trapezoidal bipyramidal stereochemistry. Complex (5) is also six-coordinate but is octahedral, with two trans-related unidentate carboxyl oxygens [mean Zn-O, 2.134(9) �] and four waters [mean Zn-O, 2.081(9) �]. The seven-coordinate complex (4) has crystallographic twofold rotational symmetry relating two :symmetric bidentate acid ligands [ Cd -O, 2.26, 2 48(:) �] and two waters [ Cd -O, 2.34(2) �] while the third water lies on this axis [ Cd -O, 2.27(2) �]. In contrast to the monomers (2)-(4), complex (5) is polymeric with tetrahedral lithium coordinated to one water and three carboxylate oxygens [mean Li-0, 1.95(1) �]. The essential conformation of the free acid is retained in complexes (2), (3) and (4) but in (5), it is considerably changed.

scholarly journals The Crystal and Molecular Structure of a trans Square-Planar Complex of Tellurium Dimethanethiosulphonate with Thiourea.

1965 ◽  
Vol 19 ◽  
pp. 2361-2368 ◽  
Author(s):  
Olav Foss ◽  
Kjartan Marøy ◽  
Steinar Husebye ◽  
Svein Solheimsnes ◽  
Brita Swan ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Crystal And Molecular Structure ◽  
Planar Complex ◽  
Square Planar

scholarly journals The Crystal and Molecular Structure of a trans Square-Planar Complex of Tellurium Dibenzenethiosulphonate with Trimethylenethiourea.

1969 ◽  
Vol 23 ◽  
pp. 3206-3216 ◽  
Author(s):  
Kjell Åse ◽  
Georg Lundgren ◽  
Wanda Mark ◽  
Hans Lundström ◽  
Gunner Borch ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Crystal And Molecular Structure ◽  
Planar Complex ◽  
Square Planar

Composés de coordination de molécules soufrées. II. Complexes pseudo-tétraédriques et plan du nickel(II) avec quelques dithiole-1,2 thiones-3

1971 ◽  
Vol 49 (15) ◽  
pp. 2598-2604 ◽  
Author(s):  
François Yves Petillon ◽  
Jacques Emile Guerchais
Keyword(s):  
Solid State ◽  
Electronic Spectra ◽  
Spectral Region ◽  
Far Infrared ◽  
Infrared Spectral Region ◽  
Planar Complex ◽  
Square Planar ◽  
Infrared Spectral ◽  
Tetrahedral Complexes

The study of the far infrared spectral region permits one to distinguish between the pseudo-tetrahedral complexes NiI2L2 (L = R1R2C3S3 where R1 = CH3 and R2 = H, R1 = R2 = CH3, R1 = C4H3S and R2 = H) and the square planar complex NiI2L′2 (L′ = R1R2C3S3 where R1 = C6H5 and R2 = H). The electronic spectra recorded in the solid state confirm the distinction. The displacement of the band νC=S of the molecule 1,2-dithio-1-3-thione which enters the sphere of coordination is more marked in the complexes of cobalt(II) than in the corresponding nickel(II) complexes.

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