scholarly journals Single-crystal ESR and X-Ray Crystallographical Studies of a Binuclear Copper(II) Complex with a Coaxially Stacked Square-pyramidal Geometry

1984 ◽  
Vol 57 (6) ◽  
pp. 1454-1458 ◽  
Author(s):  
Yuji Kajikawa ◽  
Tosio Sakurai ◽  
Nagao Azuma ◽  
Shizue Kohno ◽  
Sei Tsuboyama ◽  
...  
Keyword(s):  
Single Crystal ◽  
Binuclear Copper ◽  
X Ray ◽  
Pyramidal Geometry ◽  
Square Pyramidal Geometry

Synthesis, Crystal Structure and Antimicrobial Activity of Poly [bis-and#181;-3,5-dinitro-2-oxidobenzoato) (py) Cu II]

2020 ◽  
Vol 42 (6) ◽  
pp. 928-928
Author(s):  
Fouzia Chang Fouzia Chang ◽  
Najma Memon Najma Memon ◽  
Shahabuddin Memon Shahabuddin Memon ◽  
Muhammad Naeem Ahmed Muhammad Naeem Ahmed ◽  
Muhammad Nawaz Tahir Muhammad Nawaz Tahir ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Single Crystal ◽  
Room Temperature ◽  
Central Metal Atom ◽  
Central Metal ◽  
Single Crystal Xrd ◽  
Monoclinic System ◽  
X Ray ◽  
Pyramidal Geometry ◽  
Square Pyramidal Geometry

A novel Poly [bis-and#181;-3,5-dinitro-2-oxidobenzoato) (py) Cu II]/(C12H7CuN3O7) was synthesized by a self assemble method at room temperature. The molecular structure was determined by single-crystal X-ray analysis. The compound crystallizes in the monoclinic system, space group P 2 1/c with lattice parameters of a = 10.2143, b = 5.1651 and c = 26.608, α = 90, β = 99.720, γ = 90, Z = 4, V = 1383.60 (18) and#197;3.Pore size depicted from single crystal XRD data was 47and#197;. The central metal atom Cu (II) is coordinated with oxygen of carboxylates group and nitrogen atom of pyridine. The coordination polyhedron posses square pyramidal geometry is manifested by the N— Cu—O angle of 90o. The structure is composed of monomeric coordination units with the central copper (II) ion is not occupying a centre of symmetry.

Three novel mononuclear Mn(iii)-based magnetic materials with square pyramidal versus octahedral geometries

2017 ◽  
Vol 41 (19) ◽  
pp. 10890-10898 ◽  
Author(s):  
Malay Dolai ◽  
Abhishake Mondal ◽  
Jun-Liang Liu ◽  
Mahammad Ali
Keyword(s):  
Single Crystal ◽  
Magnetic Materials ◽  
Octahedral Geometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pyramidal Geometry ◽  
Square Pyramidal Geometry ◽  
Packing Effects

Single crystal X-ray diffraction studies reveal that complexes 1 and 2 have square pyramidal geometry and 3 has octahedral geometry, which showed a dependence of negative anisotropy (D) values on the electronic, geometry and packing effects.

scholarly journals Syntheses, Structures, Magnetic Properties and Antibacterial Activities of Two Copper(II) Azido Complexes with Varied Nuclearities Containing Symmetrical 1,3-Diammine as Chelator

2021 ◽  
Vol 33 (2) ◽  
pp. 359-366
Author(s):  
Habibar Chowdhury ◽  
Chandan Adhikary
Keyword(s):  
Hydrogen Bonds ◽  
Variable Temperature ◽  
Antibacterial Activities ◽  
Metal Centers ◽  
X Ray ◽  
Pyramidal Geometry ◽  
Azide Ion ◽  
3D Network ◽  
Square Pyramidal Geometry ◽  
Dinuclear Structure

Two copper(II) azido complexes of the types mononuclear [Cu(TMEDA)2(N3)2] (1) and dinuclear [Cu(TMEDA)(μ1,1-N3)(N3)]2 (2) [TMEDA = trimethylenediamine; N3 – = azide ion] have been synthesized and characterized. X-ray structural analysis revealed that each copper(II) center in complex 1 adopts a distorted octahedron geometry with a CuN6 chromophore ligated through four N atoms of two different symmetrical TMEDA ligands as bidentate chelator and two N atoms of two terminal azides. In complex 2, each copper(II) center adopts a distorted square pyramidal geometry with a CuN5 chromophore ligated through two N atoms of TMEDA as bidentate chelator and two N atoms of two different azides as μ1,1-N3 bridging mode and one N atom of terminal azide ion. The two copper centers are connected through double μ1,1-N3 bridges affording a dinuclear structure with Cu···Cu separation 3.327(2) Å. In crystalline state, mononuclear units in complex 1 are associated through intermolecular N-H···N and C-H···N hydrogen bonds to form a 2D sheet structure viewed along crystallographic b-axis, whereas dinuclear entities in complex 2 are propagated through intermolecular N-H···N and C-H···N hydrogen bonds to form a 3D network structure viewed along crystallographic a-axis. The Variable-temperature magnetic susceptibility measurement evidenced a dominant antiferromagnetic interaction between the metal centers through μ1,1-azide bridges in complex 2 with J = − 0.40 cm-1. The antibacterial activities of the complexes have also been studied.

Structure and magnetism in a hydroxy bridged binuclear copper(II) system with a "tunable" binuclear centre

1983 ◽  
Vol 61 (3) ◽  
pp. 579-583 ◽  
Author(s):  
Laurence K. Thompson
Keyword(s):  
Molecular Structure ◽  
Single Crystal ◽  
Coordination Geometry ◽  
Antiferromagnetic Exchange ◽  
X Ray Diffraction ◽  
Binuclear Copper ◽  
Space Group ◽  
X Ray ◽  
Oxygen Bridge ◽  
Copper Coordination

The molecular structure of [Cu2(PAP)(OH)(IO3)3]•4H2O (PAP = 1,4-di(2′-pyridyl)aminophthalazine) has been determined by single crystal X-ray diffraction. [Cu2(PAP)(OH)(IO3)3]•4H2O belongs to the space group P21/c with a = 7.266(1), b = 15.269(1), c = 25.870(1) Å, β = 96.40(I)°, V = 2852.2 Å3, Z = 4. The copper coordination geometry lies between a square pyramid and a trigonal bipyramid and the two copper(II) centres are bridged by three groups: N2 (phthalazine), hydroxide, and bidentate iodate, in a structure which is analogous to that reported for [Cu2(PAP)(OH)Cl3]•1.5H2O. Replacing the chlorine bridge by iodate has the effect of forcing the two metal centres further apart, thus creating a larger Cu—O—Cu bridge angle. This increase in oxygen bridge angle (101° to 114°) is also reflected in the enhanced antiferromagnetic exchange (−2J(Cl) = 201 cm−1, −2J(IO3) = 335 cm−1). Other groups of varying size (e.g. Br, NO3, SO4) can act as bridges between the two copper centres in systems of this sort with the resultant variation in copper–copper separation and oxygen bridge angle.

Preparation and X-Ray Structure of 4-N,N′-Bis(trimethylsilyl)- amino-3,5-diisopropylphenylselenium Trichloride

1999 ◽  
Vol 54 (9) ◽  
pp. 1170-1174 ◽  
Author(s):  
Arto Maaninen ◽  
René T. Boeré ◽  
Tristram Chivers ◽  
Masood Parvez
Keyword(s):  
Nitrogen Atom ◽  
Phenyl Ring ◽  
Electrophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Space Group ◽  
X Ray ◽  
Triclinic System ◽  
Pyramidal Geometry ◽  
Square Pyramidal Geometry

The reaction of SeCl4 or SeCl2 with N,N′-bis(trimethylsilyl)-2,6-diisopropylaniline occurs not at the nitrogen atom but by electrophilic aromatic substitution at C-4 of the phenyl ring to give [(CH3)3Si]2NC6H2 (iPr2)SeCl3 , which crystallizes as the chloro-bridged dimer in the triclinic system, space group P1̅, a - 10.2598(17), b = 13.665(3), c = 9.7838(10) Å, a = 90.056(13), ß = 102.439(11), γ = 70.922(14)°, V = 1262.3(4) Å3, Z= 1. The dimer contains an essentially planar Cl2Se(μ-Cl)2SeCl2 unit, with trans apical (Me3Si)2NC6H2(iPr)2 groups, resulting in approximately square pyramidal geometry at Se. The bridging Se-Cl distances are unequal at 2.587(2) and 2.749(2) Å.

Crystal Structure and Spectroscopic Behaviour of a Binuclear Copper(II) Complex of Mefenamic Acid and Dimethylsulfoxide

1998 ◽  
Vol 53 (8) ◽  
pp. 871-874 ◽  
Author(s):  
G. Facchin ◽  
M. H. Torre ◽  
E. Kremer ◽  
O. E. Piro ◽  
E. J. Baran
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Mefenamic Acid ◽  
Electronic Spectra ◽  
Anthranilic Acid ◽  
Binuclear Copper ◽  
Triclinic Space Group ◽  
Spectroscopic Behaviour ◽  
Space Group ◽  
X Ray

Abstract The crystal structure of the binuclear Cu(II) complex [Cu(mef)2DMSO]2 (mef = deprotonated N-2,3-dimethylphenyl-anthranilic acid; DMSO = dimethylsulfoxide) has been determined by single-crystal X-ray diffractometry. It crystallizes in the triclinic space group P1̄ with Z = 1. IR and electronic spectra of the compound are also discussed briefly.

scholarly journals Crystal structure of an unknown solvate of {2,2′-[ethane-1,2-diylbis(nitrilomethanylylidene)]diphenolato-κ4O,N,N′,O′}(N-ferrocenylisonicotinamide-κN1)cobalt(II): a CoII–salen complex that forms hydrogen-bonded dimers

2015 ◽  
Vol 71 (9) ◽  
pp. 1100-1104
Author(s):  
Bryan Brautigam ◽  
Chelsea Herholdt ◽  
William Farnsworth ◽  
Ellen Brudi ◽  
Eric McDonald ◽  
...  
Keyword(s):  
Ring Structure ◽  
X Ray Diffraction ◽  
Acta Cryst ◽  
X Ray ◽  
Pyramidal Geometry ◽  
Salen Complex ◽  
Hydrogen Bonding Interactions ◽  
Solvent Molecules ◽  
Square Pyramidal Geometry ◽  
Hydrogen Bonded

The title compound, [CoFe(C5H5)(C16H14N2O2)(C11H9N2O)], was prepared as an air-stable red–brown solid by mixing equimolar amounts of {2,2′-[ethane-1,2-diylbis(nitrilomethanylylidene)]diphenolato}cobalt(II) andN-ferrocenylisonicotinamide in dry dichloromethane under nitrogen and was characterized by ESI–MS, IR, and single-crystal X-ray diffraction. The structure at 100 K has triclinic (P-1) symmetry and indicates that the complex crystallizes as a mixture of λ and δ conformers. It exhibits the expected square pyramidal geometry about Co, and forms hydrogen-bonded dimers through amide N—H groups and phenolate O atoms on an adjacent molecule. The involvement of only half of the salen ring structure in hydrogen-bonding interactions results in slight folding of the salen ring away from the pyridine coordination site in the δ conformer with an inter-salicylidene fold angle of 9.9 (7)°. In contrast, the λ conformer is nearly planar. The dimers pack into an open structure containing channels filled with highly disordered solvent molecules. These solvent molecules' contributions to the intensity data were removed with the SQUEEZE procedure [Spek (2015).Acta Cryst.C71, 9–18] available inPLATON.

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