A dimeric nickel(II) complex of 7-azaindole

The synthesis and properties of the red dimeric nickel(11) complex [Ni2(C7H,N2)4], where C7H5N2-is the anion of 7-azaindole (1H-pyrrolo[2,3-b]pyridine), are reported. The diamagnetism and electronic spectrum are consistent with a square-planar environment about each nickel atom. Adimeric molecular structure with four anionic 7-azaindole ligands bridging a pair of bonded nickel atoms is proposed.

Download Full-text

Synthesis and molecular structure of bis(2,6-dimethylpyridine)bis-(trifluoroacetate)Cr(II) with an unusual square planar environment of the chromium atom

Inorganica Chimica Acta ◽

10.1016/s0020-1693(00)95393-3 ◽

1981 ◽

Vol 54 ◽

pp. L85-L86 ◽

Cited By ~ 7

Author(s):

I.L. Eremenko ◽

A.A. Pasynskii ◽

V.T. Kalinnikov ◽

G.G. Aleksandrov ◽

Yu.T. Struchkov

Keyword(s):

Molecular Structure ◽

Chromium Atom ◽

Square Planar ◽

Planar Environment

Download Full-text

ChemInform Abstract: SYNTHESIS AND MOLECULAR STRUCTURE OF BIS(2,6-DIMETHYLPYRIDINE)BIS(TRIFLUOROACETATO)CHROMIUM(II) WITH AN UNUSUAL SQUARE PLANAR ENVIRONMENT OF THE CHROMIUM ATOM

Chemischer Informationsdienst ◽

10.1002/chin.198151298 ◽

1981 ◽

Vol 12 (51) ◽

Author(s):

I. L. EREMENKO ◽

A. A. PASYNSKII ◽

V. T. KALINNIKOV ◽

G. G. ALEKSANDROV ◽

YU. T. STRUCHKOV

Keyword(s):

Molecular Structure ◽

Chromium Atom ◽

Square Planar ◽

Planar Environment

Download Full-text

Crystal and Molecular Structure of tetrakis(4-Methylpyridine)nickel(II)perchlorate, [Ni(II)(C6H7N)4][ClO4]2

Canadian Journal of Chemistry ◽

10.1139/v73-292 ◽

1973 ◽

Vol 51 (12) ◽

pp. 1952-1958 ◽

Cited By ~ 5

Author(s):

N. Bose ◽

H. Lynton

Keyword(s):

Molecular Structure ◽

Hydrogen Atom ◽

Least Squares ◽

Crystal And Molecular Structure ◽

Nickel Atom ◽

Monoclinic Space Group ◽

Perchlorate Ion ◽

Square Planar ◽

Final Agreement ◽

Atomic Parameters

Crystals of tetrakis(4-methylpyridine)nickel(II)perchlorate, Ni(C6H7N)4(ClO4)2, are monoclinic, space group C2/c, with a = 18.38(1), b = 10.71(1), c = 15.58(1) Ǻ, β = 109.83(5)°, and four molecules in the unit cell. The final atomic parameters were obtained from a block-diagonal least squares refinement using anisotropic thermal parameters. The hydrogen atom positions were established but the parameters were not refined. The final agreement residual for 1199 observed reflections is R = 0.049. The structure consists of discrete Ni(C6H7N)42+ and ClO4− groups. The perchlorate ion is disordered. The 4-methyl-pyridine rings are in a square planar arrangement about the nickel atom.

Download Full-text

Hexanuclear copper(II) complex of 2-hydroxy-N,N′-bis[1-(2-hydroxyphenyl)ethylidene]propane-1,3-diamine incorporating an open-cubane core

Acta Crystallographica Section E Crystallographic Communications ◽

10.1107/s2056989021005570 ◽

2021 ◽

Vol 77 (7) ◽

pp. 708-713

Author(s):

Momath Kébé ◽

Ibrahima Elhadji Thiam ◽

Mouhamadou Moustapha Sow ◽

Ousmane Diouf ◽

Aliou Hamady Barry ◽

...

Keyword(s):

Molecular Structure ◽

Hydrogen Bonds ◽

Copper Complex ◽

Hydroxyl Group ◽

Square Planar ◽

Oxygen Anions ◽

Copper Cations ◽

Planar Environment

The title molecular structure, namely, diaquatris(μ3-1,3-bis{[1-(2-oxidophenyl)ethylidene]amino}propan-2-olato)-μ3-hydroxido-dinitratohexacopper(II) ethanol trisolvate, [Cu6(C19H19N2O3)3(NO3)2(OH)(H2O)2]·3C2H5OH, corresponds to a non-symmetric hexanuclear copper complex. The complex exhibits one core in which three CuII metal centres are mutually interconnected, two by two, via three phenolato oxygen anions acting in a μ2-mode. These three copper cations are interconnected in a μ3-mode by one hydroxyl group. An open-cube structure is generated in which each of the CuII cations of the three CuO4N units is connected by two μ2-O anions from phenolate groups and one μ3-O atom from a hydroxy anion. Each of the three pentacoordinated CuII cations situated in the open-cube unit has a distorted NO4 square-pyramidal environment. Each of these three CuII centres is interconnected with another CuII cation via one enolate O atom in μ2-mode, yielding one CuNO4 unit and two CuNO3 units. The pentacoordinated CuII atom has a distorted square-pyramidal environment while the two tetracoordinated copper(II) cations are situated in a square-planar environment. A series of intramolecular O—H...O hydrogen bonds are observed. In the crystal, the units are connected two by two by intermolecular C—H...O and O—H...O hydrogen bonds, thus forming sheets parallel to the ac plane.

Download Full-text

trans-Bis[1,3-bis(2,4,6-trimethylphenyl)imidazolidin-2-ylidene]dichloronickel(II): Synthesis and Structure

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20070609 ◽

2007 ◽

Vol 72 (5-6) ◽

pp. 609-617 ◽

Cited By ~ 3

Author(s):

Andrzej Kozioł ◽

Stanisław Pasynkiewicz ◽

Antoni Pietrzykowski ◽

Lucjan B. Jerzykiewicz

Keyword(s):

Molecular Structure ◽

Crystal And Molecular Structure ◽

Nickel Atom ◽

Planar Geometry ◽

Monoclinic Crystal System ◽

X Ray Diffraction ◽

Monoclinic Crystal ◽

One Pot ◽

X Ray ◽

Square Planar

trans-Bis[1,3-bis(2,4,6-trimethylphenyl)imidazolidin-2-ylidene]dichloronickel(II), [NiCl2(SIMes)2], was synthesized in a one-pot reaction of fluorenyllithium with nickel(II) bromide followed by the addition of 1,3-bis(2,4,6-trimethylphenyl)imidazolidinium chloride. Labile difluorenyl- nickel, formed in the course of the reaction, behaves differently than nickelocene and indenocene in analogous reactions. It exchanges both fluorenyl ligands giving the title compound. The crystal and molecular structure of this compound have been determined by single-crystal X-ray diffraction. The compound crystallizes in the monoclinic crystal system with square-planar geometry around the central nickel atom.

Download Full-text