Search results for "Cobalt"

showing 10 items of 1098 documents

Large Magnetic Polyoxometalates Containing the Cobalt Cubane ‘[CoIIICo3II(OH)3(H2O)6–m(PW9O34)]3− (m = 3 or 5) as a Subunit

2018

A synthetic procedure is presented to construct new magnetic polyoxometalates (POMs) containing one or two subunits of ‘[CoIIICo3II(OH)3(H2O)6−m(PW9O34)]3−' (m = 3 or 5). The substitution of the water ligands present in these subunits by oxo or hydroxo ligands belonging to other POM fragments, gives rise to four, larger POM anions: [Co7(OH)6(H2O)6(PW9O34)2]9− (2), [Co7(OH)6(H2O)4(PW9O34)2]n9n- (2′), [Co11(OH)5(H2O)5(W6O24)(PW9O34)3]22− (3) and [{Co4(OH)3(H2O)(PW9O34)}2{K⊂(H2W12O41)2}{Co(H2O)4}2]17− (4). The crystal structures, magnetic characterization and stabilities in aqueous solutions of these POM derivatives are also presented.

crystal structureAqueous solution010405 organic chemistryMagnetismProtein subunitchemistry.chemical_elementCrystal structureGeneral Chemistry010402 general chemistrycobalt01 natural sciences0104 chemical scienceslcsh:Chemistrychemistry.chemical_compoundCrystallographylcsh:QD1-999chemistryCubanemagnetismpolyoxometalatePolyoxometalatecubane clusterCobaltFrontiers in Chemistry
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Double-CO32− Centered [CoII5] Wheel and Modeling of Its Magnetic Properties

2010

A high-spin Co(II) cluster with a rare pentagonal molecular structure and formula [Co(5)(CO(3))(2)(bpp)(5)]ClO(4) (1; Hbpp is 2,6-bis(phenyliminomethyl)-4-methylphenolate) has been synthesized and characterized by single-crystal X-ray diffraction. This topology arises from fusing five [Co(2)(bpp)] moieties in a cyclic manner around two CO(3)(2-) central ligands, resulting in propeller-like configuration. The irregular coordination of the carbonate ions to the metal centers results in a combination of coordination numbers (CNs) of the Co(II) ions of five and six. The bulk magnetization of this complicated magnetically exchanged system has been modeled successfully by employing a matrix diago…

crystal structureCoordination numberInorganic chemistrycarbonatesCatalysisIonCoordination complexMetalMagnetizationCluster (physics)Moleculecarbonate ligandschemistry.chemical_classificationOrganic Chemistrycarbonate ligands; carbonates; cobalt; coordination chemistry; density functional calculations; magnetic properties; spin-orbit coupling; crystal structure.General ChemistrySpin–orbit interactioncobaltspin-orbit couplingCrystallographychemistryvisual_artdensity functional calculationscoordination chemistryvisual_art.visual_art_mediummagnetic propertiesChemistry - A European Journal
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Crystal structure of tricarbon­yl(N-di­phenyl­phosphanyl-N,N′-diisopropyl-P-phenyl­phospho­nous di­amide-κ2 P,P′)cobalt(I) tetra­carbonyl­cobaltate(−…

2014

The title compound {Co(CO)3[Ph2PN(i-Pr)P(Ph)N(H)i-Pr]}[Co(CO)4] is an ionic species consisting of a Co(CO)3[Ph2PN(i-Pr)P(Ph)N(H)i-Pr] cation and a [Co(CO)4] anion.

crystal structureCrystallographyChemistryHydrogen bondmetallacycleTricarbonchemistry.chemical_elementGeneral ChemistryCrystal structureMetallacycleCondensed Matter PhysicsTolueneMedicinal chemistrycobaltResearch Communicationsphosphine ligandchemistry.chemical_compoundQD901-999AmideGeneral Materials ScienceCobaltCoordination geometryActa Crystallographica Section E: Structure Reports Online
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Bis{3,5-di-tert-butyl-N-[(4-dimethylamino)phenyl]salicylaldiminato}cobalt(II)

2017

In the title complex [systematic name: bis(2,4-di-tert-butyl-6-{N-[4-(dimethylamino)phenyl]carboximidoyl}phenolato)cobalt(II)], [Co(C23H31N2O)2], the cobalt(II) atom is coordinated by pairs of O and N atoms in a distorted tetrahedral coordination geometry. The dihedral angles formed by the aromatic rings of the same ligand are 51.99 (11) and 36.58 (9)°. The molecular conformation features weak intramolecular C—H...O hydrogen bonds. In the crystal, inversion-related pairs of complex molecules are linked into dimers by weak C—H...π interactions. The methyl C atoms oftert-butyl groups have rotational disorder, with site occupancies of 0.647 (7) and 0.617 (6) for the major components and 0.353 …

crystal structureHydrogen bondLigandchemistry.chemical_elementAromaticityCrystal structureDihedral angle010402 general chemistry010403 inorganic & nuclear chemistry01 natural sciencescobalt(II) complex0104 chemical sciencesCrystalCrystallographychemistrylcsh:QD901-999lcsh:Crystallographydistorted tetrahedral geometryCobaltCoordination geometryIUCrData
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Bis(4,6-di-tert-butyl-2-{N-[4-(diethylamino)phenyl]carboximidoyl}phenolato)cobalt(II)

2017

In the title complex, [Co(C25H35N2O)2], the cobalt(II) atom has a distorted tetrahedral geometry provided by pairs of O and N atoms. The dihedral angles between the benzene rings of the same ligand are 52.39 (9) and 34.96 (9)°. The molecular structure is stabilized by weak intramolecular C—H...O hydrogen bonds. The crystal packing is stabilized mainly by van der Waals forces. The structure contains a solvent-accessible void of 276 Å3which was treated using the SQUEEZE routine fromPLATON[Spek (2015).Acta Cryst.C71, 9–18]. The methyl C atoms of thetert-butyl groups are rotationally disordered, with site occupancies of 0.802 (3) and 0.548 (9) for the major components and 0.198 (3) and 0.452 (9…

crystal structureHydrogen bondchemistry.chemical_elementCrystal structureDihedral angle010402 general chemistry010403 inorganic & nuclear chemistry01 natural sciencescobalt(II) complex0104 chemical scienceschemistry.chemical_compoundsymbols.namesakeCrystallographychemistryAtomlcsh:QD901-999symbolslcsh:Crystallographyvan der Waals forceBenzenedistorted tetrahedral geometryCobaltIUCrData
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{Bis[2-(diisopropylphosphanyl)ethyl]amine}carbonyl(tetrahydroborato)cobalt(I)

2018

In the structure of title borohydride pincer complex, [Co(BH4)(C16H37NP2)(CO)], the cobalt(I) metal exhibits a distorted square-pyramidal coordination geometry with the basal positions occupied by the P and N atoms of the tridentate ligand and by the C atom of the carbon monoxide ligand. In the crystal, molecules interact only by van der Waals forces.

crystal structureLigandchemistry.chemical_elementcolbalt pincer complesCrystal structure010402 general chemistry010403 inorganic & nuclear chemistryBorohydride01 natural sciencesMedicinal chemistry0104 chemical sciencesPincer movementchemistry.chemical_compoundchemistryborohydridelcsh:QD901-999Amine gas treatinglcsh:CrystallographyCobaltCarbon monoxideCoordination geometryIUCrData
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CCDC 1880078: Experimental Crystal Structure Determination

2019

Related Article: Wenqian Shan, Nicolas Desbois, Sandrine Pacquelet, Stéphane Brandès, Yoann Rousselin, Jeanet Conradie, Abhik Ghosh, Claude P. Gros, Karl M. Kadish|2019|Inorg.Chem.|58|7677|doi:10.1021/acs.inorgchem.8b03006

diammine-(2-(5-((5-(2-oxidophenyl)-2H-pyrrol-2-ylidene)(pentafluorophenyl)methyl)-1H-pyrrol-2-yl)phenolato)-cobalt(iii) chloroform solvate monohydrateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1993352: Experimental Crystal Structure Determination

2021

Related Article: Nathália R. de Campos, Cintia A. Simosono, Iara M. Landre Rosa, Rafaela M. R. da Silva, Antônio C. Doriguetto, Walace D. do Pim, Tatiana R. Gomes Simões, Ana Karoline S. M. Valdo, Felipe T. Martins, Charlie V. Sarmiento, Wallace C. Nunes, Guilherme P. Guedes, Emerson F. Pedroso, Cynthia L. M. Pereira, Humberto O. Stumpf, Francesc Lloret, Miguel Julve, Maria Vanda Marinho|2021|Dalton Trans.|50|10707|doi:10.1039/D1DT01693H

dichloro-[22'-disulfanediylbis(pyridine)]-cobalt(ii)Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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Cobalt content of foods and diets in a Spanish population

1986

The WHO Expert Committee on Food Contaminants has pointed out the need of determining the content of foods in trace elements in order to ascertain their contribution to the total intake of oligoelements through the diet. Since the contents in trace elements depend on the environmental features, it is necessary to carry out systematic determinations of trace elements in foods of local origin in order to know the exposure level of population. This work intends to study the cobalt contribution through the diet. The element intake is calculated from the cobalt content in raw foods after elimination of the non-eatable moiety by flame atomic absorption spectroscopy, after formation of a chelate w…

education.field_of_studyPopulationExtraction (chemistry)chemistry.chemical_elementExpert committeeAmmonium pyrrolidine dithiocarbamatelaw.inventionSpanish populationchemistrylawFood scienceeducationAtomic absorption spectroscopyCobaltFood ScienceFood contaminantFood / Nahrung
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“Supported Co3O4-CeO2 monoliths: effect of preparation method and Pd-Pt promotion on the CO/CH4 oxidation activity”

2006

Abstract Two structured composite oxides, Co3O4(30wt%)-CeO2(70wt%), have been prepared by washcoating commercial cordierite monoliths with a CeO2-γAl2O3 layer, on which the active phase Co3O4-CeO2 was added through two different methods: dip-coating from a suspension containing the preformed active oxide or impregnation with a solution of the cobalt and cerium precursors. Morphological characterizations of the monoliths have been performed by BET, and SEM-EDAX analyses. Electronic and reduction properties have been evaluated by XPS and H2-TPR, respectively. The effect of the preparation method has been investigated in the catalytic oxidation of CO, whereas the promotion by a low content of …

geographygeography.geographical_feature_categoryMaterials scienceInorganic chemistryOxidechemistry.chemical_elementHeterogeneous catalysisCatalysischemistry.chemical_compoundCeriumX-ray photoelectron spectroscopyCatalytic oxidationchemistryMonolithCobaltNuclear chemistry
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