Unique Occurrence of Cationic and Anionic Bis-1,2-diaminocyclohexane Copper(II) Units in a Double Complex Salt

2016 ◽  
Vol 69 (5) ◽  
pp. 533
Author(s):  
Norman Kelly ◽  
Marco Wenzel ◽  
Thomas Doert ◽  
Kerstin Gloe ◽  
Jan J. Weigand ◽  
...  
Keyword(s):  
Complex Cation ◽  
Complex Salt ◽  
Distorted Octahedral Geometry ◽  
Double Complex ◽  
Coordination Environment ◽  
Double Complex Salt ◽  
Square Planar ◽  
Distorted Octahedral ◽  
Jahn Teller ◽  
Donor Coordination

The reaction of (±)-trans-diaminocyclohexane (dach) with copper(ii) sulfate in water resulted in the spontaneous formation of a double complex salt of type [Cu(dach)2(H2O)2][Cu(dach)2(SO4)2]·6H2O, whose X-ray structure confirmed the presence of the same square-planar Cu(dach)22+ coordination motif in both the complex cation and anion. Each copper centre adopts a Jahn–Teller-distorted octahedral geometry. Both axial positions of the metal centre in the complex cation are occupied by water molecules, whereas two monodentate sulfato ions occupy the corresponding sites in the complex anion, leading to a trans N4O2-donor coordination environment in each ion.

Octahedral Complexes of a Mixed N,N,O-Donor Ligand N-trans-(2'-hydroxycyclohexyl)-2-aminomethylpyridine

2004 ◽  
Vol 57 (5) ◽  
pp. 483 ◽  
Author(s):  
Mark J. Robertson ◽  
Geoffrey A. Lawrance ◽  
Marcel Maeder ◽  
Peter Turner
Keyword(s):  
Complex Cation ◽  
Monoclinic Space Group ◽  
Cyclohexene Oxide ◽  
Donor Ligand ◽  
X Ray ◽  
Single Isomer ◽  
Square Planar ◽  
Bonding Interaction ◽  
Distorted Octahedral ◽  
Jahn Teller

The unsymmetric mixed-donor Nam,Npy,O-ligand N-trans-(2'-hydroxycyclohexyl)-2-aminomethylpyridine (pyca, 1) was readily prepared by reaction of an epoxide (cyclohexene oxide) with (2-aminomethyl)pyridine. The ligand forms octahedral bis-tridentate complexes, exemplified with isolation of copper(II), nickel(II), zinc(II), and cobalt(III) compounds; in addition, a square-planar palladium(II) complex with the ligand behaving as bidentate was prepared. The bis-tridentate octahedral complexes may exist in six geometric isomeric forms, and molecular mechanics analysis was employed to predict the most stable isomer for copper(II), nickel(II), and cobalt(III) complexes. For the copper(II) and cobalt(III) complexes, the predictions match the X-ray crystal structures of the single isomer isolated in each case. Both the copper(II) complex [Cu . 12](ClO4)2 and the cobalt(III) complex [Co . 1 . (1–H)](ClO4)2 crystallized in the monoclinic space group P21/n (no. 14), with a 9.8400(13), b 15.434(2), c 10.0180(13) Å, and β 109.004(2)°, and a 14.162, b 18.583, c 21.596 Å, and β 100.04°, respectively. Both complexes adopt distorted octahedral structures. The copper(II) complex exists as the all-trans-fac isomer with Jahn–Teller elongation of the Cu–O bond [2.3795(19) Å] compared to Cu–Npy [2.040(2) Å] and Cu–Nam [2.024(2) Å] distances. The cobalt(III) complex appears as the cis,cis,trans(Npy) fac isomer, but deprotonation of one of the two alcohol groups leads to all six M–L distances differing: for each of two similar independent complex cations, Co–O [e.g. 1.9123(16), 1.9459(16) Å], Co–Nam [e.g. 1.949(2), 1.968(2) Å], and Co–Npy [e.g. 1.938(2), 1.940(2) Å] vary, with particularly the deprotonated alcohol bond significantly shorter than the protonated bond, despite a strong hydrogen bonding interaction with the protonated alcohol in the partner complex cation in the unit cell.

Synthesis, crystal structure and spectroscopic properties oftrans-dibromidobis(2,2-dimethylpropane-1,3-diamine-κ2N,N′)chromium(III) perchlorate

2015 ◽  
Vol 71 (5) ◽  
pp. 351-356 ◽  
Author(s):  
Dohyun Moon ◽  
Jong-Ha Choi
Keyword(s):  
Complex Cation ◽  
Complex Salt ◽  
Spectroscopic Properties ◽  
Field Analysis ◽  
Distorted Octahedral Geometry ◽  
Ligand Field ◽  
X Ray Diffraction ◽  
Distorted Octahedral ◽  
Overlap Model ◽  
Similar Complex

The title complex salt,trans-anti-[CrBr2(Me2tn)2]ClO4(where Me2tn = 2,2-dimethylpropane-1,3-diamine, C5H14N2), was prepared and its structure determined by single-crystal X-ray diffraction at 100 K. The asymmetric unit contains three conformationally similar complex cations and three perchlorate anions. In each complex cation, the CrIIIcentre is coordinated by four N atoms of two chelating Me2tn ligands in the equatorial plane and by two Br atoms in atrans-axial arrangement, to give a distorted octahedral geometry. Interionic contacts are dominated by extensive hydrogen bonding, involving the NH groups of the Me2tn ligand as donors and the anion O atoms or coordinated Br atoms as acceptors, resulting in two-dimensional layers in thebcplane. Ligand field analysis based on the angular overlap model, and IR and electronic spectroscopic properties, are also discussed.

scholarly journals Bis[tetrakis(pyridin-2-yl)methane-κ3N,N′,N′′]cobalt(II) tetrakis(thiocyanato-κN)cobaltate(II) methanol monosolvate

2014 ◽  
Vol 70 (3) ◽  
pp. m96-m97 ◽  
Author(s):  
Yuya Tsunezumi ◽  
Kouzou Matsumoto ◽  
Shinya Hayami ◽  
Akira Fuyuhiro ◽  
Satoshi Kawata
Keyword(s):  
Complex Anion ◽  
Complex Cation ◽  
Solvent Molecule ◽  
Octahedral Geometry ◽  
Title Complex ◽  
Distorted Octahedral Geometry ◽  
Weak Hydrogen Bond ◽  
Tetrahedral Geometry ◽  
Distorted Tetrahedral Geometry ◽  
Distorted Octahedral

The title complex, [Co(C21H16N4)2][Co(NCS)4]·CH3OH, consists of one [Co{C(py)4}2]2+complex cation [C(py)4= tetrakis(pyridin-2-yl)methane], one [Co(NCS)4]2−complex anion and a methanol solvent molecule. In the cation, the CoIIatom is coordinated by six N atoms of two C(py)4ligands in a distorted octahedral geometry. In the anion, the CoIIatom is coordinated by the N atoms of four NCS−ligands in a distorted tetrahedral geometry. The methanol molecule is disordered and was modelled over three orientations (occupancies 0.8:0.1:0.1). There are two weak hydrogen-bond-like interactions between the methanol solvent molecule and NCS−ligands of the anion [O...S = 3.283 (3) and 3.170 (2) Å].

A new approach towards the study of thermal decomposition and formation processes of nanoalloys: the double complex salt [Pd(NH3)4][PtCl6]

2018 ◽  
Vol 42 (7) ◽  
pp. 5071-5082 ◽  
Author(s):  
Tatyana I. Asanova ◽  
Igor P. Asanov ◽  
Min-Gyu Kim ◽  
Mihaela Gorgoi ◽  
Jonas Sottmann ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Complex Salt ◽  
Decomposition Process ◽  
Formation Processes ◽  
Thermal Decomposition Process ◽  
Double Complex ◽  
New Approach ◽  
Double Complex Salt

The thermal decomposition process of the [Pd(NH3)4][PtCl6] double complex salt was investigated using in situ XAFS, XPS, HAXPES, and XRD.

scholarly journals Synthesis and Characterization of the Ligand Based on Benzimidazole and Its Copper Complex: DNA Binding and Antioxidant Activity

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Huilu Wu ◽  
Fan Kou ◽  
Fei Jia ◽  
Bin Liu ◽  
Jingkun Yuan ◽  
...  
Keyword(s):  
Antioxidant Properties ◽  
Distorted Octahedral Geometry ◽  
Coordination Environment ◽  
Distorted Octahedral ◽  
Calf Thymus ◽  
Elemental Analyses ◽  
Displacement Experiments ◽  
Ct Dna

A new copper(II) complex with formulae of [Cu(buobb)2](pic)2, where buobb stands for the ligand of 1,3-bis(1- butylbenzimidazol-2-yl)-2-oxopropane and pic represents 2,4,6-trinitrophenol, has been synthesized and characterized by elemental analyses, molar conductivity, IR, UV-Vis spectra measurements, and cyclic voltammetry. The crystal structure of the copper(II) complex has been determined by X-ray single-crystal diffraction. The coordination environment around each copper(II) atom can be described as a distorted octahedral geometry. The π-π stacking interactions link the copper(II) complex into a 1D infinite network. The interactions of the ligand and the copper(II) complex with calf thymus DNA (CT-DNA) are investigated by using electronic absorption titration, ethidium bromide-DNA displacement experiments, and viscosity measurements. Additionally, the copper(II) complex’s antioxidant properties have been investigated in vitro.

scholarly journals Bis[bis(2,2′-bipyridine-κ2N,N′)(carbonato-κ2O,O′)cobalt(III)] 2-{4-[(carboxylatomethyl)carbamoyl]benzamido}acetate hexahydrate

2014 ◽  
Vol 70 (5) ◽  
pp. m160-m161 ◽  
Author(s):  
Niels-Patrick Pook ◽  
Mimoza Gjikaj ◽  
Arnold Adam
Keyword(s):  
Complex Cation ◽  
Three Dimensional ◽  
Water Molecules ◽  
Supramolecular Network ◽  
Asymmetric Unit ◽  
Aromatic Rings ◽  
Coordination Environment ◽  
Distorted Octahedral ◽  
Carbonate Anion ◽  
Distorted Octahedral Coordination Environment

The complex cation of the title compound, [Co(CO3)(C10H8N2)2]2(C12H10N2O6)·6H2O, contains a CoIIIatom with a distorted octahedral coordination environment formed by four N atoms from two bidentate 2,2′-bipyridine ligands and one bidentate carbonate anion. The asymmetric unit is completed by one-half of the 2-({4-[(carboxylatomethyl)carbamoyl]phenyl}formamido)acetate dianion, which is located on a centre of inversion, and by three water molecules. Two [Co(CO3)(C10H8N2)2]+cations are connected through C—H...O contacts by the uncoordinating anions. The aromatic rings of the 2,2′-bipyridine ligands and diacetate anions are involved in π–π stacking and C—H...π interactions. The centroid–centroid distances are in the range 3.4898 (4)–3.6384 (5) Å. The crystal structure is stabilized by further O—H...O and N—H...O hydrogen bonds, which give rise to a three-dimensional supramolecular network.

Two complexes of PtIVand AuIIIwith 2,2′-dipyridylamine and 2,2′-dipyridylaminide ligands

2014 ◽  
Vol 70 (12) ◽  
pp. 1133-1137
Author(s):  
Alexander N. Chernyshev ◽  
Vadim Yu. Kukushkin ◽  
Matti Haukka
Keyword(s):  
Metal Atom ◽  
Weak Interactions ◽  
Structural Features ◽  
Coordination Environment ◽  
One Dimensional ◽  
Square Planar ◽  
Distorted Octahedral ◽  
Chloride Ligands ◽  
The Difference ◽  
Distorted Octahedral Coordination Environment

Two noble metal complexes involving ancillary chloride ligands and chelating 2,2′-bipyridylamine (Hdpa) or its deprotonated derivative (dpa), namely [bis(pyridin-2-yl-κN)amine]tetrachloridoplatinum(IV), [PtCl4(C10H9N3)], and [bis(pyridin-2-yl-κN)aminido]dichloridogold(III), [AuCl2(C10H8N3)], are presented and structurally characterized. The metal atom in the former has a slightly distorted octahedral coordination environment, formed by four chloride ligands and two pyridyl N atoms of Hdpa, while the metal atom in the latter has a slightly distorted square-planar coordination environment, formed by two chloride ligands and two pyridyl N atoms of dpa. The difference in conjugation between the pyridine rings in normal and deprotonated 2,2′-dipyridylamine is discussed on the basis of the structural features of these complexes. The influence of weak interactions on the supramolecular structures of the complexes, providing one-dimensional chains of [PtCl4(C10H9N3)] and dimers of [AuCl2(C10H8N3)], are discussed.

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