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Literatura científica selecionada sobre o tema "Complexes de cobalt(III)"

Autor: Grafiati

Publicado: 29 de março de 2025

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Artigos de revistas sobre o assunto "Complexes de cobalt(III)"

Ali Mohamed, Ahmed Y. "STUDIES ON THE BACTERIAL ACTIVITY OF COBALT(III) COMPLEXES. PART III. COBALT(III) CARBOXYLATE COMPLEXES". Journal of Coordination Chemistry 29, n.º 4 (agosto de 1993): 233–46. http://dx.doi.org/10.1080/00958979308037429.

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Mohamed, Ahmed Y. Ali. "STUDIES ON THE BACTERIAL ACTIVITY OF COBALT(III) COMPLEXES. PART III. COBALT(III) CARBOXYLATE COMPLEXES". Journal of Coordination Chemistry 29, n.º 3 (julho de 1993): 233–46. http://dx.doi.org/10.1080/00958979308045670.

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Arderne, Charmaine, Kyle Fraser Batchelor, Bhawna Uprety, Rahul Chandran e Heidi Abrahamse. "Reactivity trends of cobalt(III) complexes towards various amino acids based on the properties of the amino acid alkyl chains". Acta Crystallographica Section C Structural Chemistry 76, n.º 7 (5 de junho de 2020): 663–72. http://dx.doi.org/10.1107/s2053229620007123.

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The reactivity of the cobalt(III) complexes dichlorido[tris(2-aminoethyl)amine]cobalt(III) chloride, [CoCl2(tren)]Cl, and dichlorido(triethylenetetramine)cobalt(III) chloride, [CoCl2(trien)]Cl, towards different amino acids (L-proline, L-asparagine, L-histidine and L-aspartic acid) was explored in detail. This study presents the crystal structures of three amino acidate cobalt(III) complexes, namely, (L-prolinato-κ2 N,O)[tris(2-aminoethyl)amine-κ4 N,N′,N′′,N′′′]cobalt(III) diiodide monohydrate, [Co(C5H8NO2)(C6H18N4)]I2·H2O, I, (L-asparaginato-κ2 N,O)[tris(2-aminoethyl)amine-κ4 N,N′,N′′,N′′′]cobalt(III) chloride perchlorate, [Co(C4H7N2O3)(C6H18N4)](Cl)(ClO4), II, and (L-prolinato-κ2 N,O)(triethylenetetramine-κ4 N,N′,N′′,N′′′)cobalt(III) chloride perchlorate, [Co(C4H7N2O3)(C6H18N4)](Cl)(ClO4), V. The syntheses of the complexes were followed by characterization using UV–Vis spectroscopy of the reaction mixtures and the initial rates of reaction were obtained by calculating the slopes of absorbance versus time plots. The initial rates suggest a stronger reactivity and hence greater affinity of the cobalt(III) complexes towards basic amino acids. The biocompatibility of the complexes was also assessed by evaluating the cytotoxicity of the complexes on cultured normal human fibroblast cells (WS1) in vitro. The compounds were found to be nontoxic after 24 h of incubation at concentrations up to 25 mM.

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Salib, Kamal A. R., Samy M. Abu El-Wafa, Salah B. El-Maraghy e Saied M. El-Sayed. "Sulfitoamine Complexes of Cobalt(III)". Phosphorus, Sulfur, and Silicon and the Related Elements 46, n.º 3-4 (dezembro de 1989): 131–38. http://dx.doi.org/10.1080/10426508909412058.

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Massoud, Salah S., Franz A. Mautner, Morsy Abu-Youssef e Nadia M. Shuaib. "Azido–amine–cobalt(III) complexes". Polyhedron 18, n.º 17 (julho de 1999): 2287–91. http://dx.doi.org/10.1016/s0277-5387(99)00106-0.

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Lindner, Leonie, e Peter Klüfers. "Cobalt(III) Complexes ofD-Galactosylamine". Zeitschrift für anorganische und allgemeine Chemie 641, n.º 11 (14 de julho de 2015): 1869–73. http://dx.doi.org/10.1002/zaac.201500224.

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Veeralakshmi, Selvakumar, Selvan Nehru, Gopal Sabapathi, Sankaralingam Arunachalam, Ponnambalam Venuvanalingam, Ponnuchamy Kumar, Chidambaram Anusha e Vilwanathan Ravikumar. "Single and double chain surfactant–cobalt(iii) complexes: the impact of hydrophobicity on the interaction with calf thymus DNA, and their biological activities". RSC Advances 5, n.º 40 (2015): 31746–58. http://dx.doi.org/10.1039/c5ra02763b.

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Alam, M. M., S. M. S. Islam, S. M. M. Rahman e M. M. Rahman. "Simultaneous Preparation of Facial and Meridional Isomer of Cobalt-Amino Acid Complexes and their Characterization". Journal of Scientific Research 2, n.º 1 (29 de dezembro de 2009): 91–98. http://dx.doi.org/10.3329/jsr.v2i1.2032.

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Preparation and characterization of various complexes of cobalt (III)-amino acid system, especially cobalt (III) glycinato and cobalt (III) alaninato complexes are reported. The identification of the various isomers of these complexes is also reported. The various isomers are separated from their mixture by fractional crystallization. Each of these complexes has been characterized by observing physical characteristics, chemical analysis, UV-visible spectroscopy and IR-spectroscopy. The direct impact of geometry of the complexes to IR stretching frequencies and UV-visible spectral data of amino and carboxyl group in the complexes provided sufficient information about the geometry. A prediction about the geometries of the synthesized has also been focused. Keywords: Cobalt; Amino acid; Isomers; UV-visible; IR. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i1.2032 J. Sci. Res. 2 (1), 91-98 (2010)

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Uprety, Bhawna, Rahul Chandran, Charmaine Arderne e Heidi Abrahamse. "Anticancer Activity of Urease Mimetic Cobalt (III) Complexes on A549-Lung Cancer Cells: Targeting the Acidic Microenvironment". Pharmaceutics 14, n.º 1 (17 de janeiro de 2022): 211. http://dx.doi.org/10.3390/pharmaceutics14010211.

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Tumour cells maintain a local hypoxic and acidic microenvironment which plays a crucial role in cancer progression and drug resistance. Urease is a metallohydrolases that catalyses the hydrolysis of urea into ammonia and carbon dioxide, causing an abrupt increase of pH. This enzymatic activity can be employed to target the acidic tumour microenvironment. In this study, we present the anticancer activities of urease mimetic cobalt (III) complexes on A549 cells. The cells were treated with different doses of cobalt (III) complexes to observe the cytotoxicity. The change in cellular morphology was observed using an inverted microscope. The cell death induced by these complexes was analysed through ATP proliferation, LDH release and caspase 3/7 activity. The effect of extracellular alkalinization by the cobalt (III) complexes on the efficacy of the weakly basic drug, doxorubicin (dox) was also evaluated. This combination therapy of dox with cobalt (III) complexes resulted in enhanced apoptosis in A549 cells, as evidenced by elevated caspase 3/7 activity in treated groups. The study confirms the urease mimicking anticancer activity of cobalt (III) complexes by neutralizing the tumour microenvironment. This study will motivate the applications of transition metal-based enzyme mimics in targeting the tumour microenvironment for effective anticancer treatments.

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Ali-Mohamed, Ahmed Y., e M. �l-Khedri. "Studies on the bacterial activity of cobalt(III) complexes. Part I. Cobalt(III) amine complexes". Transition Metal Chemistry 13, n.º 6 (dezembro de 1988): 434–36. http://dx.doi.org/10.1007/bf01043705.

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Mais fontes

Teses / dissertações sobre o assunto "Complexes de cobalt(III)"

Jane, Reuben Thomas. "Cobalt(III) Complexes For Surface Engineering". Thesis, University of Canterbury. Chemistry, 2010. http://hdl.handle.net/10092/4424.

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This thesis addresses the potential for use of cobalt(III) complexes for functionalisation of lightly oxidised iron surfaces. In Chapter 2 the preparation of cobalt(III) complexes of a series of ligands based on 1,1,1-tris(aminomethyl)ethane is described. The synthesis was approached in two ways. Firstly, preparation of functionalised triol molecules as precursors to functionalised triamine ligands was investigated. This approach utilised the Tollens condensation of aldehydes with formaldehyde. In a second approach, the functionalisation of tetrakis(aminomethyl)methane in which one amine arm has been differentiated was used. The tetraamine was reacted with benzaldehyde and reduced with borohydride ion to give a secondary amine molecule that was then functionalised using alkyl or aryl sulfonyl chloride molecules. Chapter 3 describes the measurement of the binding of some cobalt(III) complexes to the surface of high surface area goethite. It was observed that complexes that have three exchangeable ligands bind more strongly than those with two exchangeable ligands. This is rationalised as being due to there being more bonds to the surface formed by complexes with three exchangeable ligands. It was also observed that complexes with three exchangeable ligands give greater surface coverage than those with two. This is likely due to the larger cross sectional area of the complexes with two exchangeable ligands in comparison to that of those with three, which blocks potential adjacent sites. Preliminary experiments on the use of the contact angle, SEM, EDS and QCM to characterise complex binding are explored in Chapter 4 . The results from the EDS and QCM experiments show that these may be valuable tools for measuring this binding and the subsequent surface properties, but have not yielded detailed results at this point. In Chapter 5 the use of cobalt(III) complexes as inhibitors of corrosion of iron in hydrochloric acid is investigated. All the complexes tested, even those that showed no binding to goethite surfaces, inhibit the corrosion to some degree. The level of inhibition is dependent on the complex, with [Co(tren)Cl2]Cl showing maximum inhibition of 81% and [Co(tame)Cl3] showing maximum inhibition of 53%. For some of the complexes, their concentration in solution over the course of the experiment was monitored by UV-vis. It was found that the complex disappears in a zero order reaction, the rate of which is dependent on the complex. However, the exact nature of this reaction is unknown. Furthermore, it was observed that inhibition of corrosion continues after the complex is no longer observed in solution. There is a difficulty in rationalising the inhibition being dependent on the complex identity, but not its continued presence in solution. Consequently, the mechanism of corrosion inhibition that explains all of these observations is still not known.

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Telfer, Shane G. "The photochemistry of cobalt(III)-aminoacidato complexes". Thesis, University of Canterbury. Chemistry, 1999. http://hdl.handle.net/10092/7818.

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The photodecarboxylation reaction of Co(III)-aminocarboxylato complexes has been examined from several angles. Firstly, the currently accepted mechanism for the formation of [Co(bpy)(CHâ‚‚NHâ‚‚)]2+, following the UV photolysis of [Co(bpy)2(gly)]2+ (bpy = 2,2'-bipyridine, gly = glycinate), has been tested. A Co(II)-bound aminocyclopropylmethyl radical, with a lifetime of around 10^-4s, has been proposed as a reaction intermediate. This assertion was tested with the use of a radical clock, derived from chelated cyclopropylglycine. If a Co(II)-bound aminocyclopropylmethyl radical is formed, it will ring-open with rate constant k >= 10^7 s^-1 (298 K). This rate constant has been estimated on the basis of transition-state theoretical calculations and published data for related radicals. The cyclopropyl group actually survived photolysis, and was found as cyclopropanecarboxaldehyde. This result implies that either the rate determining step has been wrongly assigned, or the proposed mechanism is incorrect. Carbonyl compounds were also detected following the photolysis of [Co(bpy)2(aa)]^2+complexes, where aa = alaninate, valinate, phenylglycinate, and aminoisobutyrate. It was proposed that a Co-C-N metallacycle is formed briefly, but decomposes to give a Co(I) complex and an iminium ion. Hydrolysis of the latter fragment would account for the carbonyl compounds. Secondly, some novel Co-C-N metallacycles have been prepared via the photodecarboxylation reaction. Cobalt(III) complexes with N,N-bis(2- pyridylmethyl)aminoacidate (amino acid = glycine, alanine, and cyclopropylglycine) ligands with 1,10-phenanthroline (phen) filling the remaining coordination sites, were prepared. Upon UV photolysis in aqueous solution, all three complexes yielded Co-CN metallacycles which were sufficiently stable to allow characterisation by conventional ^1H NMR, ^13C NMR, and UV-vis techniques. The solid state structure of the photolysis product of the glycinate derivative was determined by X-ray crystallography. These organometallic products eventually decompose, giving carbonyl compounds, free bis(2- pyridylmethyl)amine (bpa), free phen and the Co(II) ion. A peroxo-bridged Co(III) dimer, [Co(phen)(bpa)(02)Co(phen)(bpa)]^4+, crystallised from this mixture, and was characterised by X-ray crystallography. Thirdly, the UV photolysis reactions of a series of [Co(bpy)2(aa)]^2+in DMSO solution were investigated. Carbonyl compounds are also produced in this solvent. The formation of trans(N)-[Co(aa)2(bpy)]+ complexes was also observed. This was ascribed to secondary (thermal) chemistry between dissolved molecular oxygen and some of the photolysis products: free amino acid, free phen, and Co(II). This same mixture gave rise to the [Co(bpy)3]3+ ion in aqueous solution. This difference was rationalised on the basis of the equilibria of the various [CoII(aa)x(bpy)y]^(2-x)+ complexes in the different solvents, and the potentials at which they are oxidised.

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Sun, Lihui. "Synthesis and reactivity of some cobalt-, phosphorus-chiral cobalt(III) complexes". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ34235.pdf.

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Ernst, Margot Christiana. "Ab initio calculations on chiral cobalt (III) complexes". Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/27429.

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McClintock, Lisa F., e n/a. "Studies of cobalt(III) complexes containing tripodal tetraamine ligands". University of Otago. Department of Chemistry, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080505.142115.

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The new Co(III) carbonate complexes [Co(uns-penp)(O₂CO)]ClO₄�H₂O and [Co(trpyn)(O₂CO)]ClO₄, containing tripodal tetraamine ligands, have been synthesised and characterised by microanalysis, �H, ��C and ⁵⁹Co NMR, mass spectrometry (MS) and UV-vis spectroscopy. In addition, the ⁵⁹Co NMR spectra have been obtained for two series of [Co(N₄)(O₂CO)]⁺ complexes containing aliphatic (N₄ = tren, baep, abap, trpn) and pyridyl (N₄ = tpa, pmea, pmap, tepa) tripodal tetraamine ligands and the complex [Co(dppa)(O₂CO)]⁺. The ⁵⁹Co NMR signal increases as [Delta] decreases, indicating there is less electron density at the Co(III) nucleus as the metal-ligand orbital overlap becomes poorer. A linear relationship was found to exist between the [Delta] for the individual complexes and their ⁵⁹Co NMR chemical shifts which follows the relationship: [Delta] = 29 174 + -0.89363 x [delta](⁵⁹Co) For the two series of [Co(N₄)(O₂CO)]+ complexes, plots of the magnetogyric ratio (γ) and [lambda][max] have y-intercepts that do not accurately correspond to the magnetogyric ratio of the bare cobalt nucleus (γ₀(Co)). This is due to the deviation of the complexes from pure octahedral symmetry. A fluxional process in the complex [Co(pmea)(O₂CO)]⁺ was investigated using variable temperate (VT) NMR. This was found to involve the inversion of a six-membered chelate ring about a pseudo mirror plane with a [Delta]G[double dagger] of 58 kJ mol⁻� at 25 �C. Mass spectra have been obtained for all the [Co(N₄)(O₂CO)]⁺ complexes, and these show a common fragmentation pattern for all the complexes except [Co(trpn)(O₂CO)]⁺, where CO₂ is lost from the molecular ion to give a [Co(N₄)O]⁺ adduct. Single crystal X-ray structural analyses were performed on [Co(abap)(O₂CO)]ClO₄ (orthorhombic, Pca2₁, a = 15.9744(11) Å, b = 8.6200(6) Å, c = 21.8568(15) Å, α = β = γ = 90�, Z = 8, R1 = 0.0350, wR2 = 0.0902), [Co(trpn)(O₂CO)]ClO₄�H₂O (monoclinic, P2₁/c, a = 11.9510(19) Å, b = 12.0740(19) Å, c = 12.917(2) Å, β = 117.56(4)�, α = γ = 90�, Z = 4, R1 = 0.0476, wR2 = 0.1188), [Co(tpa)(O₂CO)]ClO₄�2H₂O (triclinic, P-1, a = 16.2298(5) Å, b = 17.2291(5) Å, c = 17.3393(5) Å, α = 106.760(1)�, β = 92.809(1)�, γ = 108.004(1)�, Z = 8, R1 = 0.0349, wR2 = 0.0799), [Co(uns-penp)(O₂CO)]ClO₄�H₂O (triclinic, P-1, a = 6.7544(3) Å, b = 11.5523(5) Å, c = 12.3201(6) Å, α = 73.397(2)�, β = 89.749(2)�, γ = 84.551(2), Z = 2, R1 = 0.0277, wR2 = 0.0842) and [Co(trpyn)(O₂CO)]ClO₄ (monoclinic, P2₁/n, a = 12.2777(5) Å, b = 11.9322(4) Å, c = 27.9622(11) Å, β = 100.082(2)�, α = γ = 90�, Z = 8, R1 = 0.0435, wR2 = 0.1130). Rates of acid hydrolysis of [Co(N₄)(O₂CO)]⁺ (N₄ = baep, abap, trpn, tpa, pmea, pmap, tepa, uns-penp, dppa, trpyn, Me₃-tpa) complexes were measured by stopped flow or UV-vis spectroscopy (I = 1.0 mol L⁻�). The product of acid hydrolysis of [Co(pmea)(O₂CO)]⁺ has been indentified by X-ray crystallography as [Co(pmea)(OH₂)₂]�⁺ (triclinic, P-1, a = 9.7065(5) Å, b = 15.5645(8) Å, c = 11.5740(5) Å, α = 84.660(1)�, β = 123.255(1)�, γ = 104.283(1)�, Z = 2, R1 = 0.0402, wR2 = 0.1009). The acid hydrolysis reactions of the [Co(N₄)(O₂CO)]⁺ complexes containing aliphatic (N₄ = baep, abap, trpn) tripodal tetraamine ligands and [Co(tpa)(O₂CO)]⁺ and [Co(Me₃-tpa)(O₂CO)]⁺ have been investigated over the range [H₃O⁺] = 0.10 - 1.0 mol L⁻� Three processes were observed for the hydrolysis of [Co(baep)(O₂CO)]⁺, [Co(abap)(O₂CO)]⁺ and [Co(trpn)(O₂CO)]⁺ at all [H₃O⁺]. The first and second processes were thought to be [H₃O⁺] dependent, while the third was fit to a first order exponential decay and was [H₃O⁺] independent (k[obs] ~ 4.2 x 10⁻� s⁻� for [Co(baep)(O₂CO)]⁺, 3.8 x 10⁻� s⁻� for [Co(abap)(O₂CO)]⁺ and 3.5 x 10⁻� s⁻� for [Co(trpn)(O₂CO)]⁺). However, none of the processes could be confidently assigned to a step in the acid hydrolysis mechanism. The data obtained from the studies of [Co(tpa)(O₂CO)]⁺ and [Co(Me₃-tpa)(O₂CO)]⁺ showed a single first order [H₃O⁺] dependent process which was fit to the following expression: k[obs] = (k₁K[H₃O]⁺)/(1 + K[H₃O]⁺ This gave k₁ = 5.8 x 10⁻⁴ � 2.3 x 10⁻⁴ s⁻� and K = 0.13 � 0.06 L mol⁻� for [Co(tpa)(O₂CO)]⁺ at 25 �C and k₁ = 6.0 x 10⁻⁵ � 2.0 x 10⁻⁶ s⁻� and K = 0.38 � 0.02 L mol⁻� for [Co(Me₃-tpa)(O₂CO)]⁺ at 50 �C. Both values of K indicate that protonation of chelated carbonate is far from complete at [H₃O⁺] = 1.0 mol L⁻�. Comparative rates of acid hydrolysis at [H₃O⁺] = 6.0 mol L⁻� were obtained for the complexes [Co(tpa)(O₂CO)]⁺ (k[obs] = 1.79 x 10⁻� s⁻�, 25 �C), [Co(pmea)(O₂CO)]⁺ (k[obs] = 1.8 x 10⁻⁵ s⁻�, 25 �C), [Co(pmap)(O₂CO)]⁺ (k[obs] = 2.5 x 10⁻⁵ s⁻�, 50 �C), [Co(tepa)(O₂CO)]⁺ (k[obs] = 4.3 x 10⁻⁵ s⁻�, 25 �C) and [Co(trpyn)(O₂CO)]⁺ (k[obs] = 1.3 x 10⁻⁴ s⁻�, 50 �C) and at [H₃O⁺] = 1.0 mol L⁻� for the complexes [Co(uns-penp)(O₂CO)]⁺ (k[obs] = 2.9 x 10⁻� s⁻�, 25 �C) and [Co(dppa)(O₂CO)]⁺ (k[obs] = 2.7 x 10⁻⁴ s⁻�, 25 �C). The vast differences in the rates of acid hydrolysis can be rationalised on a steric basis. Bulkier ancillary ligands impede the direct protonation of an endo oxygen atom, or the transfer of a proton from the exo to an endo oxygen atom. The chelated bicarbonate complex [Co(trpyn)(O₂COH)]ZnCl₄�3H₂O has been synthesised and characterised by microanalysis and X-ray crystallography (orthorhombic, Pbca, a = 18.1820(66) Å, b = 14.7256(44) Å, c = 19.6344(68) Å, α = β = γ = 90�, Z = 8, R1 = 0.0435, wR2 = 0.1130). The first products of direct metallion of coordinated carbonate, under both acidic and neutral conditions, have been isolated and characterised by microanalysis and IR spectroscopy. The X-ray crystal structures of the bimetallic complexes [Co(Me-tpa)O₂COZnCl₃]�H₂O (triclinic, P-1, a = 8.262(1) Å, b = 11.290(1) Å, c = 13.766(2) Å, α = 95.314(4)�, β = 103.160(4)�, γ = 107.071(5)�, Z = 2, R1 = 0.0382, wR2 = 0.0940) and [Co(pmea)O₂COZnCl₃]�H₂O (triclinic, P-1, a = 8.2916(7) Å, b = 11.0999(11) Å, c = 14.0994(13) Å, α = 8.2916(7)�, β = 102.607(4)�, γ = 108.600(4)�, Z = 2, R1 = 0.0347, wR2 = 0.0770), and the trimetallic complex [(Co(trpyn)(O₂CO))₂Zn(H₂O)̀₄](ZnCl₄)₂�3H₂O (monoclinic, P2₁/c, a = 20.9734(17) Å, b = 17.3712(12) Å, c = 15.7635(13) Å, β = 111.376(4)�, α = γ = 90�, Z = 4, R1 = 0.0235, wR2 = 0.0517) have been obtained. In addition, the X-ray crystal structures of the complexes [Co(trpyn)(O₂CO)](Zn(OH)₂Cl₃)�4H₂O (triclinic, P-1, a = 7.4962(7) Å, b = 13.4019(11) Å, c = 13.6887(11) Å, α = 74.631(4)�, β = 82.893(4)�, γ = 82.324(4)�, Z = 2, R1 = 0.0268, wR2 = 0.0638) and [Co(tepa)(O₂CO)]₂(ZnCl₄)�3H₂O (triclinic, P-1, a = 9.9250(10) Å, b = 15.5561(13) Å, c = 15.8730(16) Å, α = 89.545(4)�, β = 85.019(5)�, γ = 72.714(4)�, Z = 2, R1 = 0.0291, wR2 = 0.0722) were obtained. These two complexes were synthesised under analogous conditions to the bi- and trimetallic complexes. However, in these cases metallation of chelated carbonate did not occur. DFT calculations have been used to calculate the relative energies of pairs of geometric isomers of [Co(N₄)(O₂CO)]⁺ complexes (N₄ = baep, abap, pmea, pmap, dppa, Me-tpa, Me₂-tpa). In all cases, except that of [Co(Me-tpa)(O₂CO)]⁺, the calculations correctly predict that the experimentally observed isomer is lower in energy. An electronic study on two series of [Co(N₄)(O₂CO)]⁺ complexes containing pyridyl (N₄ = tpa, pmea, pmap, tepa) and Me-pyridyl (N₄ = tpa, Me-tpa, Me₂-tpa, Me₃-tpa) tripodal tetraamine ligands correctly reproduces the observed trends in ⁵⁹Co NMR chemical shift and [Delta] values. A molecular orbital analysis of the two series of complexes shows that there is no significant difference between the highest energy occupied orbitals with the largest contribution from the coordinated oxygen atoms. Bond decomposition analyses of the two series of complexes indicate that there is also no difference in total bond energies. These results indicate that there is no electronic explanation for the large differences in reactivity towards acid that is observed experimentally. The first mononuclear complex containing chelated hydrogen phosphate, [Co(pmea)(O₂PO₂H)]ClO₄, has been synthesised and characterised using microanalysis, �H, ��C, ��P and ⁵⁹Co NMR, UV-vis spectroscopy and X-ray crystallography (monoclinic, P2₁/c, a = 8.7017(17) Å, b = 27.639(5) Å, c = 9.586(2) Å, β = 112.818(9)�, α = γ = 90�, Z = 4, R1 = 0.0443, wR2 = 0.1076). The X-ray crystal structure of [Co(pmeaH)(OH₂)Cl₂](CoCl₄)�H₂O (orthorhombic, P2₁2₁2₁, a = 12.6354(3) Å, b = 12.6354(3) Å, c = 15.8261(11) Å, α = β = γ = 90�, Z = 4, R1 = 0.0397, wR2 = 0.0954), in which the pmea ligand is coordinated in a hypodentate fashion, was also obtained. [Co(pmeaH)(OH₂)Cl₂](CoCl₄)�H₂O is thought to be an impurity in crude samples of [Co(pmea)Cl₂]Cl. The pK[a] of [Co(pmea)(O₂PO₂H)]⁺ was determined to be 4.99 � 0.02 by potentiometric titration. A ring inversion fluxional process, analogous to that observed for [Co(pmea)(O₂CO)]⁺, was found by VT-NMR to have a [Delta]G[double dagger] of 60 kJ mol⁻� at 35 �C. A ��P NMR spectrum, taken after the solution was left standing for approximately three hours, showed evidence of cleavage of the hydrogen phosphate chelate via a bimetallic hydrolysis mechanism. Attempts were also made to synthesise Co(III) complexes containing chelated phosphate ester ligands (monomethyl phosphate and monophenyl phosphate), with pmea as the ancillary ligand. ��P NMR spectra of the crude samples indicate that the monomethyl phosphate moiety is chelated to Co(III) (��P [delta] = 21.05 ppm). However, it is unclear whether the monophenyl phosphate is chelated or bridging between two Co(III) ions (��P [delta] = 14.36 ppm).

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McCombs, Michelle. "A 59-Cobalt NMR Investigation of the Hydrogen/Deuterium Exchange Kinetics in Cobalt(III) Complexes". TopSCHOLAR®, 2003. http://digitalcommons.wku.edu/theses/554.

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Currently, the hydrogen/deuterium exchange kinetics in cobalt(III) complexes are being investigated. In the presence of deuterated solvents, (e.g. D2 0 and CH3CH20D) the amine hydrogens in the complexes are exchanged for deuteriums. For the hexaamminecobalt(III) ion, 19 isotopmers (H18D0 to HOD 18) are possible. For the tris(ethylenediammine)cobalt(III) ion, 13 isotopmers (HI 2D0 to HOD 12) are possible. Each hydrogen/deuteruim exchange causes a shift in the observed 59Co resonance of approximately 6 ppm. The rate constant of the hydrogen-deuterium exchange for the first H-D exchange has been determined as a function of solvent. When the chosen solvent is D20, the rate constant is 1.09 x 10° sec"1 for the hexaamminecobalt(III) ion. In methanol-d, the rate constant is 1.82 x 10"4 sec"'. Electronic effects of ligands have also been investigated. Experimental conditions (e.g., observation frequencies and solution parameters) and the representative NMR spectra are presented.

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Simonato, Jean-Pierre. "Chimie de coordination de la tétraméthylchiroporphyrine avec le fer(III), le cobalt(III) et le rhodium(III) : applications à l'analyse d'énantiomères d'amines, à la complexation énantiosélective d'aminoalcools, et à la catalyse d'aziridination asymétrique". Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10051.

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Des complexes metalliques de la tetramethylchiroporphyrine, de symetrie et possedant des groupements meso derives du biocartol, ont ete synthetises, caracterises, et utilises dans quatre axes de recherches. _la caracterisation du complexe bis-ethanol de la tetramethylchiroporphyrine de fer(iii), en solution et en phase solide, revele que ce compose presente un etat de spin inhabituel : le spin intermediaire pur (s = 3/2). _l'insertion d'un metal diamagnetique, le cobalt(iii), coordonnant les amines au cur de la porphyrine, a permis l'analyse qualitative et quantitative de la composition de derives d'amines par resonance magnetique nucleaire du proton. Cette methode s'est averee precise, fiable, rapide et tres facile d'utilisation. _l'addition de -aminoalcools sur cette meme molecule resulte en la complexation preferentielle d'un enantiomere. Les aspects cinetiques et thermodynamiques ont ete abordes, et une explication quant a l'enantioselectivite observee est avancee sur la base de liaisons hydrogene intramoleculaires de type c-h___o. _parmi differentes complexes de la tetramethylchiroporphyrine, ceux de fer(iii) et de manganese(iii) ont donne les meilleurs resultats pour la catalyse d'aziridination asymetrique, avec des exces enantiomeriques allant jusqu'a 57% pour le styrene. Un point remarquable est l'induction asymetrique opposee de ces deux catalyseurs, chacun favorisant la formation majoritaire d'un enantiomere.

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Wilson-Coutts, Sarah Mary. "The Synthesis and Configuration of Some Polydentate Amino Acid Complexes of Cobalt(III)". Thesis, University of Canterbury. Chemistry, 2009. http://hdl.handle.net/10092/2788.

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This thesis reports a study of polydentate amino acid complexes of cobalt(III). The complexes prepared during this project have been characterized by a range of techniques, including ¹³C{¹H} and ¹H NMR spectroscopy, UV-visible spectroscopy, infra-red spectroscopy, elemental analysis and single crystal X-ray structure determination. A total of seven single crystal X-ray structure determinations have been performed during these studies. The imino acid polydentate complex, [Co(Aim₂trien)]₂[ZnCl₄], was reduced to the corresponding amino acid complex, [Co(A₂trien)]Cl, where as many as ten diastereoisomers could be formed due to the formation of new stereogenic centres. The crude product of these reactions was a mixture of isomers, according to ¹³C{¹H} NMR data. These isomers were separated using ion-exchange chromatography. The major isomer (I1), a minor isomer (I2a) and a half reduced complex (I4a) from the [Co(A₂trien)]Cl reduction and separation experiment were characterised. The predominant isomers produced were found to have had the proton on the α-carbon atoms positioned on the amine face of each amino acid ligand fragment. To investigate the ratio of the isomers formed by the initial borohydride reduction, an isomerisation study of the major isomer of the [Co(A₂trien)]⁺ complex (I1) was performed. This study hoped to establish the degree to which the distribution of isomers was a result of dynamic equilibrium. Experiments on a small scale showed the initial isomer distribution to be similar to that obtained from the borohydride reduction reaction. However, prolonged exposure to the carbonate buffer (≈ two weeks) resulted in isomers not previously seen. Experiments on a large scale were performed to establish whether the results were consistent. The materials from both the two hour and two week experiments were mixtures of isomers by ¹³C{¹H} NMR spectroscopy and were separated using ion-exchange chromatography. ¹H NMR data of the two hour experiment showed only epimerisation of the amine proton adjacent to the α-carbon atom. Therefore the isomers produced from the isomerisation of I1 have the same configuration of the proton on the α-carbon atoms, which is on the amine face of each amino acid chelate ring. ¹H NMR data from the two week experiment resulted in new isomers not previously seen as both the amine proton and the proton on the α-carbon atom have been epimerised. The polyamine wrapping around the central metal ion may also have changed in some cases. It would appear, from the ¹H NMR data that the methyl group signals of these isomers fall in two distinct clusters; a cluster at δ 1.50-1.65 ppm and a cluster at δ 1.40-1.49 ppm. From these results, and the results of Chapter Two, it has been calculated that there is at least 92% facial selectivity for the amine face of the molecule during the initial borohydride reduction reactions. This may be due to a di-hydrogen bonding interaction between an adjacent amine proton and a hydride of the borohydride, which directs the attack. Following on from this study, a new range of imino and amino acid complexes were synthesised using different tetraamine and pentaamine cobalt(III) complexes. X-ray quality crystals of [Co(Aim₂2,2,3-tet)][ClO₄] and [Co(Aim₂2,3,2-tet)][ClO₄] were obtained and solved with assistance from Dr. Chris Fitchett and Dr. Jennifer Burgess. Borohydride reductions were performed on the [Co(Aim₂2,2,3-tet)]⁺ and [Co(Aim₂2,3,2-tet)]⁺ systems. The products were a mixture of isomers according to 1H and ¹³C{¹H} NMR spectroscopy. The results from the ¹H NMR experiments showed similarity between the [Co(A₂2,3,2-tet)]⁺ and [Co(A₂trien)]⁺ systems, where three major stereoisomers were present in solution. Analogous results for the asymmetric [Co(A₂2,2,3-tet)]⁺ system were also observed. Preliminary attempts have been made to separate these isomers using ion-exchange chromatography.

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Cai, Lezhen. "Mechanisms and salt effects in photoredox and quenching processes involving cobalt(III) complexes". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21925.pdf.

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Jewiss, H. C. "Some coordination complexes of cobalt(III) and some related X-ray crystallographic studies". Thesis, University of Southampton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373933.

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Livros sobre o assunto "Complexes de cobalt(III)"

Taylor, L. J. Sulfur dioxide adsorption on cobalt complexes. Manchester: UMIST, 1997.

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Riley, Sarah. Exploring enantioselective recognition using chiral cobalt complexes. [Derby: University of Derby], 1996.

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Grigg, Julian. Hydroxyoxime complexes of vanadium, manganese and cobalt. Manchester: University of Manchester, 1994.

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Nicholls, Julian Charles. Carbon-carbon bond cleavage in agostic Cobalt complexes. Salford: University of Salford, 1989.

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Jendrusch-Borkowski, Barbara. Starbust-(PAMAM)-Dendrimerkomplexe von Cobalt(III) und Chrom(III). [s.l.]: [s.n.], 1998.

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Khan, Tasneem A. Chemistry of organogold (I) & (III) complexes. Manchester: UMIST, 1997.

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W, Buchler J., ed. Metal complexes with Tetrapyrrole Ligands III. Berlin: Springer, 1995.

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Harris, J. Robin, e Jon Marles-Wright, eds. Macromolecular Protein Complexes III: Structure and Function. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58971-4.

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Waterson, Jennifer Louise. The synthesis and use of cobalt complexes in catalytic chain transfer polymerisation. [s.l.]: typescript, 2000.

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Darmstadt, Technische Universität, ed. Synthesen und Reaktionen Trimethylphosphan-gestützter Acyl-Enolato-Cobalt(III)-Verbindungen. [s.l.]: [s.n.], 1999.

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Capítulos de livros sobre o assunto "Complexes de cobalt(III)"

Springbørg, J., C. E. Schäffer, John M. Preston e Bodie Douglas. "Dianionobis(ethylenediamine)cobalt(III) Complexes". In Inorganic Syntheses, 63–77. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132456.ch14.

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Davies, R., Masayasu Mori, A. G. Sykes, J. A. Weil, L. Centofanti, H. Ogino e J. C. Bailar. "Binuclear Complexes of Cobalt(III)". In Inorganic Syntheses, 197–214. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132432.ch35.

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Hargens, Robert D., Woonza Min, Robert C. Henney, T. M. Brown e A. Galliart. "Bis(ethylenediamine)sulfito Complexes of Cobalt(III)". In Inorganic Syntheses, 77–81. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132456.ch15.

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Dixon, N. E., W. G. Jackson, G. A. Lawrance, A. M. Sargeson, U. Goli e E. S. Gould. "Cobalt(III) Amine Complexes with Coordinated Trifluoromethanesulfonate". In Inorganic Syntheses, 103–7. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132531.ch21.

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Crayton, Philip H., Fred Zitomer e Jack Lambert. "Inner Complexes of Cobalt(III) with Diethylenetriamine". In Inorganic Syntheses, 207–13. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132388.ch56.

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Dey, Atanu, Shalini Tripathi, Maheswaran Shanmugam, Ramakirushnan Suriya Narayanan e Vadapalli Chandrasekhar. "Cobalt(II)/(III)–Lanthanide(III) Complexes as Molecular Magnets". In Topics in Organometallic Chemistry, 77–100. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/3418_2018_9.

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Dey, Atanu, Shalini Tripathi, Maheswaran Shanmugam, Ramakirushnan Suriya Narayanan e Vadapalli Chandrasekhar. "Correction to: Cobalt(II)/(III)–Lanthanide(III) Complexes as Molecular Magnets". In Topics in Organometallic Chemistry, 413. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/3418_2019_33.

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Springborg, Johan, Claus Erik Schäffer, Michael L. Wilson, J. Marcus Wharton e William E. Hatfield. "Tetraammine and Bis(Ethylenediamine) Complexes of Chromium(III) and Cobalt(III)". In Inorganic Syntheses, 75–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132494.ch15.

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Valentine, Donald. "The Photochemistry of Cobalt(III) and Chromium(III) Complexes in Solution". In Advances in Photochemistry, 123–92. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470133361.ch2.

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Halloran, Leon J., Arlene L. Gillie, J. Ivan Legg, Patrick J. Garnett e Donald W. Watts. "Ethylenediamine-N,N ′-Diacetic Acid Complexes of Cobalt(III)". In Inorganic Syntheses, 103–11. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132494.ch17.

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Trabalhos de conferências sobre o assunto "Complexes de cobalt(III)"

Kritchenkov, I. S., M. Samandar, N. A. Zharskaia, S. A. Silonov, E. E. Galenko, D. O. Karpitskaya e S. P. Tunik. "Ir(III) complexes – sensors for hypoxia detection". In 2024 International Conference Laser Optics (ICLO), 540. IEEE, 2024. http://dx.doi.org/10.1109/iclo59702.2024.10624100.

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Chi, Yun, e Jie YAN. "Homoleptic iridium(III) carbene complexes as efficient blue OLED phosphors?" In Organic and Hybrid Light Emitting Materials and Devices XXVIII, editado por Tae-Woo Lee, Franky So e Ji-Seon Kim, 38. SPIE, 2024. http://dx.doi.org/10.1117/12.3026978.

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Burn, Paul L. "Seeing is believing: experimental 3D mapping of iridium(III) complexes in light-emitting guest:host blends". In Organic and Hybrid Light Emitting Materials and Devices XXVIII, editado por Tae-Woo Lee, Franky So e Ji-Seon Kim, 28. SPIE, 2024. http://dx.doi.org/10.1117/12.3023720.

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Ilyushin, Mikhail, Irina Shugalei, Andrey Tverjanovich, Juliya Pavlyukova, Zoya Kapitonenko, Andrey Smirnov e Igor Tselinskiya. "COMMUNICATION OF INITIAL STAGES OF DECOMPOSITION OF LIGANDS OF AMMINE TETRAZOLATES COBALT (III) WITH THE INITIATING ABILITY OF COMPLEXES". In Chemistry of nitro compounds and related nitrogen-oxygen systems. LLC MAKS Press, 2019. http://dx.doi.org/10.29003/m790.aks-2019/347-351.

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Hilerio, I., M. A. Barro´n e M. Vite. "3D Characterization of Surface State in a Knee Prosthesis". In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63850.

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From the medical point of view it is important that the surface roughness in a knee prosthesis be small in order to reduce the wear friction due to the physical contact of the prosthesis with bone. Given the complex form of the knee prosthesis, formerly the finishing process was carried out through a manual technique. However, this technique has many drawbacks. In this work a mechanochemical method (MCM) for finishing is proposed in order to obtain a proper surface state of the prosthesis. The selected MCM consisted of a mild wear procedure which employs HLB-11 as tensoactive additive. Composition of the knee prosthesis pieces was as follows: 26.5% Cr, 4.5% Mo, and the balance was cobalt. In order to optimize the prosthesis manufacturing, the evolution of the surface state along the finishing process was studied and a 3D analysis of the surface topography was carried out. To do this, two types of topometers were utilized, one of them with a tactile sensor and another one with an optical sensor. Fourier transform was applied to data roughness in order to determine the skweness (Rsk) and kurtosis (Rku) roughness values.

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Batchelor, Anna, e Michael Duncan. "INFRARED PHOTODISSOCIATION SPECTROSCOPY OF COBALT CATION ACETYLENE COMPLEXES". In 2023 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2023. http://dx.doi.org/10.15278/isms.2023.7216.

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Joshi, S. K., V. K. Hinge e B. D. Shrivastava. "EXAFS Studies of Cobalt(II) Complexes with Amino Acids". In X-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference. AIP, 2007. http://dx.doi.org/10.1063/1.2644518.

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Revathi, C., S. Soundeswaran e O. Senthilkumar. "Synthesis and characterization of dibromobis (dimethyl glyoxime)cobalt(II) complexes". In INTELLIGENT BIOTECHNOLOGIES OF NATURAL AND SYNTHETIC BIOLOGICALLY ACTIVE SUBSTANCES: XIV Narochanskie Readings. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0179480.

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Abaas, Ahmed K., e Iftikhar M. Ali. "Effect of cobalt Ions precursor on the nanostructure of sprayed cobalt oxide thin films". In PROCEEDINGS OF THE III INTERNATIONAL CONFERENCE ON ADVANCED TECHNOLOGIES IN MATERIALS SCIENCE, MECHANICAL AND AUTOMATION ENGINEERING: MIP: Engineering-III – 2021. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0068678.

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Tupikova, E. N., I. A. Platonov e D. S. Khabarova. "Nano catalysts obtained from platinum and cobalt or nickel binary complexes". In EMERGING TECHNOLOGIES: MICRO TO NANO (ETMN-2017): Proceedings of the 3rd International Conference on Emerging Technologies: Micro to Nano. Author(s), 2018. http://dx.doi.org/10.1063/1.5047735.

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Relatórios de organizações sobre o assunto "Complexes de cobalt(III)"

Nizameeva, Guliya, Irek Nizameev, Danis Kadirov, Igor Strel’nik, Marsil Kadirov, Yuliya Budnikova, Andrey Karasik e Oleg Sinyashin. Cathode catalysts on cobalt coordination bis-diphosphine complexes. Peeref, julho de 2023. http://dx.doi.org/10.54985/peeref.2307p2634998.

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Smith, Michael Edward. Synthesis, characterization, and reactivity of pentamethylcyclopentadienyl complexes of divalent cobalt and nickel. Office of Scientific and Technical Information (OSTI), outubro de 1993. http://dx.doi.org/10.2172/10108086.

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Shi, Shu. Mechanistic studies on reactivities of organometallic macrocyclic complexes of chromium and cobalt. Office of Scientific and Technical Information (OSTI), dezembro de 1990. http://dx.doi.org/10.2172/6222164.

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Alexandar, Irina, Nikolay Kaloyanov, Veneta Parvanova, Christian Girginov e Alexander Zahariev. Antimicrobial Activity of Bi(III) Complexes with Some Sulphonic Acids. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, agosto de 2021. http://dx.doi.org/10.7546/crabs.2021.08.06.

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Kelley, D. Kinetics and mechanisms of the reactions of alkyl radicals with oxygen and with complexes of Co(III), Ru(III), and Ni(III). Office of Scientific and Technical Information (OSTI), outubro de 1990. http://dx.doi.org/10.2172/6454295.

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Shen, Wen-Tang. A polarographic study of Fe(II) and Fe(III) complexes with catechol. Portland State University Library, janeiro de 2000. http://dx.doi.org/10.15760/etd.2795.

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Flatté, Michael E. Final Report: Atomistic Studies of Individual Impurities and Impurity Complexes in III-V Semiconductors. Office of Scientific and Technical Information (OSTI), janeiro de 2020. http://dx.doi.org/10.2172/1595773.

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Reilly, S. D., C. F. V. Mason e P. H. Smith. Cobalt (III) dicarbollide: A potential sup 137 Cs and sup 90 Sr waste extraction agent. Office of Scientific and Technical Information (OSTI), fevereiro de 1990. http://dx.doi.org/10.2172/7079517.

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Bromm, A. J. Jr, L. M. Vallarino, R. C. Leif e J. R. Quagliano. The addition of a second lanthanide ion to increase the luminescence of europium(III) macrocyclic complexes. Office of Scientific and Technical Information (OSTI), dezembro de 1998. http://dx.doi.org/10.2172/314151.

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Xun, Luying. Integrated Investigation on the Production and Fate of Organo-Cr(III) Complexes from Microbial Reduction of Chromate. Office of Scientific and Technical Information (OSTI), junho de 2005. http://dx.doi.org/10.2172/893591.

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