A Rare Example of a Dinuclear Cobalt(II) Complex with Dipicolinate and Bridging 2-Aminopyrazine Ligands. Preparation, Structural, Spectroscopic and Thermal Characterization

2011 ◽  
Vol 66 (8) ◽  
pp. 813-818 ◽  
Author(s):  
Masoumeh Tabatabaee ◽  
Boris-Marko Kukovec ◽  
Vajieh Razavimahmoudabadi
Keyword(s):  
Dipicolinic Acid ◽  
3D Structure ◽  
Thermal Characterization ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
Coordination Environment ◽  
Distorted Octahedral ◽  
Elemental Analyses ◽  
Coordinated Water ◽  
Oxygen Atoms

A dinuclear cobalt(II) complex, [Co2(H2O)4(dipic)2(μ-apyz)] (dipicH2 = pyridine-2,6-dicarboxylic (dipicolinic) acid, apyz = 2-aminopyrazine) (1), has been hydrothermally synthesized and characterized by elemental analyses, spectroscopic methods (IR, UV/Vis), thermal analysis as well as by X-ray diffraction studies. The dinuclear complex is composed of two cobalt(II) ions bridged by a 2-aminopyrazine molecule. Each cobalt(II) ion is coordinated by one nitrogen and two oxygen atoms of the tridentate dipicolinate anion, one heterocyclic nitrogen atom of the 2-aminopyrazine and two oxygen atoms of coordinated water molecules. The resulting geometry for the CoN2O4 coordination environment can be described as distorted octahedral. Various hydrogen bonds of the type O-H···O and N-H···O are also present in the crystal structure. This arrangement leads to the formation of a 3D structure.

A Pyrazine-Bridged Ni(II) Coordination Polymer

2002 ◽  
Vol 57 (11) ◽  
pp. 1191-1194 ◽  
Author(s):  
Chirantan Roy Choudhury ◽  
Subrata Kumar Dey ◽  
Sutapa Sen ◽  
Bappaditya Bag ◽  
Samiran Mitra ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Chain Structure ◽  
Water Molecules ◽  
Polymeric Complex ◽  
X Ray Diffraction ◽  
Intermolecular Hydrogen Bonds ◽  
X Ray ◽  
Elemental Analyses ◽  
Coordinated Water ◽  
Nitrate Anions

The single pyrazine-bridged polymeric complex {[Ni(pyz)(H2O)4](NO3)2.2H2O}n has been synthesised and characterised by elemental analyses, IR and UV-vis spectra, and a single-crystal X-ray diffraction study. The coordination around the Ni centre is perfectly octahedral. The Ni(H2O)4 coordination planes are bridged by pyrazine ligands forming an infinite chain structure. Two nitrate anions and two water molecules exist in the lattice and are linked by intermolecular hydrogen bonds to the coordinated water molecules.

scholarly journals Hydrothermal Synthesis, Structural Characterization, and Interaction Mechanism with DNA of Copper(II) Complex Containing 2,2′-Bipyridine

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Ting Liu ◽  
Yi-An Wang ◽  
Qing Zang ◽  
Guo-Qing Zhong
Keyword(s):  
Fluorescence Probe ◽  
Interaction Mechanism ◽  
Distorted Octahedral Geometry ◽  
Water Molecules ◽  
Binding Modes ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Distorted Octahedral ◽  
Elemental Analyses ◽  
Polymeric Chains

A Cu(II) complex [Cu(bipy)(H2O)2(SO4)]n (bipy = 2,2′-bipyridine) was synthesized by hydrothermal method and characterized structurally by elemental analyses, single crystal X-ray diffraction, infrared spectra, and thermogravimetry and differential scanning calorimetry. The Cu(II) was hexacoordinated by two N atoms from bipy, two O atoms from different sulfate radical anions, and two O atoms from two water molecules, forming a slightly distorted octahedral geometry, and bridged by sulfato groups into polymeric chains. Under the condition of physiological pH, the interaction mechanism between the complex and hsDNA was explored with acridine orange as a fluorescence probe by spectroscopic methods. The binding modes between the complex and hsDNA were the electrostatic and embedded modes.

scholarly journals catena-Poly[[diaqua(1H-imidazo[4,5-f][1,10]phenanthroline)cobalt(II)]-μ-sulfato]

2009 ◽  
Vol 65 (6) ◽  
pp. m618-m618 ◽  
Author(s):  
Jian Yu
Keyword(s):  
Three Dimensional ◽  
Title Complex ◽  
Water Molecules ◽  
Coordination Environment ◽  
One Dimensional ◽  
Distorted Octahedral Coordination ◽  
Dimensional Network ◽  
Distorted Octahedral ◽  
Coordinated Water ◽  
Distorted Octahedral Coordination Environment

The CoIIion in the title complex, [Co(SO4)(C13H8N4)(H2O)2]n, has a slightly distorted octahedral coordination environment formed by two O atoms from two symmetry-related bridging sulfate ligands, two N atoms from a bis-chelating 1H-imidazo[4,5-f][1,10]phenanthroline (IPL) ligand and two O atoms from coordinated water molecules. The bridging sulfate ligands connect CoIIions to form a one-dimensional chain along theb-axis direction. In the crystal structure, intermolecular O—H...O, O—H...N and N—H...O hydrogen bonds link the chains into a three-dimensional network.

A Dimeric Copper(II) Complex of Oxalate and Oxamide Dioxime Ligands: Synthesis, Crystal Structure, Thermal Stability, and Magnetic Properties

2014 ◽  
Vol 69 (3) ◽  
pp. 321-326 ◽  
Author(s):  
Justin Nenwa ◽  
Patrick L. Djonwouo ◽  
Emmanuel N. Nfor ◽  
Michel M. Bélombé ◽  
Erwann Jeanneau ◽  
...  
Keyword(s):  
Layer Structure ◽  
Variable Temperature ◽  
Thermal Analyses ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
Centrosymmetric Dimer ◽  
Weight Losses ◽  
Network Variable ◽  
Distorted Octahedral ◽  
Coordinated Water

The dimeric copper(II) complex [Cu(C2O4)(H2oxado)(H2O)]2 (1), where H2oxado=oxamide dioxime, has been synthesized in water and characterized by elemental and thermal analyses, IR spectroscopy, and single-crystal X-ray diffraction. Complex 1 is composed of two neutral [Cu(C2O4)(H2oxado)(H2O)] entities connected by Cu-O bonds between oxalate oxygen atoms and copper(II) ions, thereby producing a centrosymmetric dimer, with the Cu(II) centers exhibiting a strongly distorted octahedral coordination. Neighboring dimers are hydrogen-bonded through O- H···O interactions leading overall to a layer structure. Thermal analyses of complex 1 showed two significant weight losses corresponding to the coordinated water molecules, followed by the decomposition of the network. Variable-temperature (10 - 300 K) magnetic susceptibility measurements revealed very weak antiferromagnetic interactions (θ = 0:86 K from Curie-Weiss law behavior) within the dinuclear unit

scholarly journals Synthesis, Crystal Structure, and Antimicrobial Properties of a Novel 1-D Cobalt Coordination Polymer with Dicyanamide and 2-Aminopyridine

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Amah Colette Benedicta Yuoh ◽  
Moise Ondoh Agwara ◽  
Divine Mbom Yufanyi ◽  
Mariam Aseng Conde ◽  
Rajamony Jagan ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Metal Ion ◽  
Antimicrobial Properties ◽  
X Ray Diffraction ◽  
Coordination Environment ◽  
One Dimensional ◽  
Distorted Octahedral ◽  
Elemental Analyses ◽  
Cobalt Coordination ◽  
Distorted Octahedral Coordination Environment

A novel one-dimensional coordination polymer bis(2-aminopyridine)-μ-bis(dicyanamido) cobaltate(II) has been synthesized and characterized by elemental analyses and infrared and ultraviolet visible spectroscopies and the structure has been determined by single crystal X-ray diffraction. Co(II) ion in the complex is coordinated to two axial 2-aminopyridine ligands through the pyridine N-atom and four equatorial dicyanamide ligands to give a CoN6 slightly distorted octahedral coordination environment around the metal ion. The amino N-atom forms intrachain hydrogen bonds. Antimicrobial screening of the complex against eight pathogenic microorganisms (four bacteria and four fungi) isolated from humans, indicates that the complex is moderately active.

scholarly journals Crystal structure of a TbIII–CuII glycinehydroxamate 15-metallacrown-5 sulfate complex

2021 ◽  
Vol 77 (12) ◽  
pp. 1-0
Author(s):  
Anna V. Pavlishchuk ◽  
Inna V. Vasylenko ◽  
Matthias Zeller ◽  
Anthony W. Addison
Keyword(s):  
Positive Charge ◽  
Title Complex ◽  
Water Molecules ◽  
Inversion Center ◽  
Coordination Environment ◽  
Sulfate Anion ◽  
The Core ◽  
Square Planar ◽  
Coordinated Water ◽  
Oxygen Atoms

The core of the title complex, bis[hexaaquahemiaquapentakis(μ3-glycinehydroxamato)sulfatopentacopper(II)terbium(III)] sulfate hexahydrate, [TbCu5(SO4)(GlyHA)5(H2O)6.5]2(SO4)·6H2O (1), which belongs to the 15-metallacrown-5 family, consists of five glycinehydroxamate dianions (GlyHA2−; C2H4N2O2) and five copper(II) ions linked together forming a metallamacrocyclic moiety. The terbium(III) ion is connected to the centre of the metallamacrocycle through five hydroxamate oxygen atoms. The coordination environment of the Tb3+ ion is completed to an octacoordination level by oxygen atoms of a bidentate sulfate and an apically coordinated water molecule, while the copper(II) atoms are square-planar, penta- or hexacoordinate due to the apical coordination of water molecules. Continuous shape calculations indicate that the coordination polyhedron of the Tb3+ ion in 1 is best described as square antiprismatic. The positive charge of each pair of [TbCu5(GlyHA)5(H2O)6.5(SO4)]2 2+ fragments is compensated by a non-coordinated sulfate anion, which is located on an inversion center with 1:1 disordered oxygen atoms. Complex 1 is isomorphous with the previously reported compounds [LnCu5(GlyHA)5(SO4)(H2O)6.5]2(SO4), where Ln III = Pr, Nd, Sm, Eu, Gd, Dy and Ho.

scholarly journals An infinite two-dimensional hybrid water–chloride network in a 4′-(furan-2-yl)-2,2′:6′,2′′-terpyridine nickel(II) matrix

2017 ◽  
Vol 73 (6) ◽  
pp. 871-875 ◽  
Author(s):  
Wei-Wei Fu ◽  
Ya-Qian Li ◽  
Yang Liu ◽  
Man-Sheng Chen ◽  
Wei Li ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Chloride Ions ◽  
Water Molecules ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Coordination Environment ◽  
X Ray ◽  
Solvent Water ◽  
Distorted Octahedral ◽  
Shaped Pattern

A new complex, namely bis[4′-(furan-2-yl)-2,2′:6′,2′′-terpyridine]nickel(II) dichloride decahydrate, [Ni(C19H13N3O)2]Cl2·10H2O, has been crystallized by solvent evaporation and characterized by single-crystal X-ray diffraction. The coordination environment of the NiIIcation is distorted octahedral with slight deviations from an idealized geometry. The most intriguing structural feature is an infinite two-dimensional hybrid water–chloride network parallel to (011) constructed by O—H...O and O—H...Cl hydrogen bonds involving two independent chloride ions and ten independent solvent water molecules with an L-shaped pattern. One of the furyl rings is disordered with a refined occupancy ratio of 0.786 (13):0.214 (13)

Study on Crystal Structure and Thermal Stability of Hexaaquanickel (II) Bis[4-amino-3-methyl-benzenesulfonate]

2013 ◽  
Vol 643 ◽  
pp. 64-67
Author(s):  
Li Hua Wang
Keyword(s):  
Self Assembly ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
Complex Molecules ◽  
X Ray ◽  
Dimensional Network ◽  
Distorted Octahedral ◽  
Coordinated Water ◽  
Light Green ◽  
Thermal Stability Of

Light green crystals of the Ni (II) complex material, [Ni(H2O)6](C14H16N2O6S2), were obtained by the self-assembly of Ni(H2O)6·6H2O, 4-amino-3-methyl-benzenesulfonic acid and NaOH. The result of X-ray diffraction shows that each Ni (II) atom is six-coordinated in a distorted octahedral environment by six oxygen atoms from the water molecules. The complex molecules are connected by hydrogen bonds to form two dimensional network structure. The thermal analysis shows that the complex has a enothermic peak at 302 C, indicating that coordinated water molecules are in the complex.

A Novel Hydrogen-bonded Zigzag Chain Manganese(III) Complex: Synthesis, Crystal Structure and Magnetic Properties

2007 ◽  
Vol 62 (5) ◽  
pp. 691-695 ◽  
Author(s):  
Hulya Kara
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Axial Direction ◽  
Water Molecules ◽  
Zigzag Chain ◽  
X Ray Diffraction ◽  
X Ray ◽  
Distorted Octahedral ◽  
Coordinated Water ◽  
Donor Power

AbstractThe synthesis, crystal structure and magnetic properties of [Mn(III)L(H2O)2]+ClO4 −, 1 [L = N,N′-bis(rac-3,5-dichlorosalicylidenato)-1,2-diaminopropane] are reported. Single crystal X-ray diffraction studies showed the structure to consist of [MnL(H2O)2]+ octahedra, with trans-coordinated water molecules, which are linked into infinite helices by hydrogen bonds. The distorted octahedral manganese(III) centre contains an N2O2O′2 coordination sphere made up of the Schiff base ligand in the equatorial plane. In the axial direction, an elongation of the trans Mn-Owater bonds to 2.165(2) and 2.187(2) Å is observed. Such elongations are typical of d4 systems but in this case may also be attributed to the poorer donor power of the water molecules.

scholarly journals Crystal structure of 2-methyl-1H-imidazol-3-ium aquatrichlorido(oxalato-κ2O,O′)stannate(IV)

2015 ◽  
Vol 71 (5) ◽  
pp. 520-522 ◽  
Author(s):  
Mouhamadou Birame Diop ◽  
Libasse Diop ◽  
Laurent Plasseraud ◽  
Thierry Maris
Keyword(s):  
Hydrogen Bonds ◽  
Water Molecule ◽  
Three Dimensional ◽  
Free Oxygen ◽  
Coordination Environment ◽  
Dimensional Network ◽  
Oxalate Ligand ◽  
Distorted Octahedral ◽  
Distorted Octahedral Coordination Environment ◽  
Oxygen Atoms

The tin(IV) atom in the complex anion of the title salt, (C4H7N2)[Sn(C2O4)Cl3(H2O)], is in a distorted octahedral coordination environment defined by three chlorido ligands, an oxygen atom from a water molecule and two oxygen atoms from a chelating oxalate anion. The organic cation is linked through a bifurcated N—H...O hydrogen bond to the free oxygen atoms of the oxalate ligand of the complex [Sn(H2O)Cl3(C2O4)]−anion. Neighbouring stannate(IV) anions are linked through O—H...O hydrogen bonds involving the water molecule and the two non-coordinating oxalate oxygen atoms. In combination with additional N—H...Cl hydrogen bonds between cations and anions, a three-dimensional network is spanned.

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