Relevant bibliographies by topics / Cobalt porphyrin

Academic literature on the topic 'Cobalt porphyrin'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Cobalt porphyrin.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Cobalt porphyrin"

1

FUKUZUMI, SHUNICHI, and SOUTA NOURA. "Cobalt(III) Porphyrin-catalysed Hydride Reduction of 10-Methylacridinium ion and Hydrometallation of Alkenes and Alkynes by Tributyltin Hydride." Journal of Porphyrins and Phthalocyanines 01, no. 03 (July 1997): 251–58. http://dx.doi.org/10.1002/(sici)1099-1409(199707)1:3<251::aid-jpp24>3.0.co;2-p.

Full text
Abstract:
Cobalt(III) tetraphenylporphyrin catalyses a hydride transfer reaction from tributyltin hydride to 10-methylacridinium ion via the formation of hydridocobalt(III) tetraphenylporphyrin, which is the rate-determining step, followed by facile hydride transfer from the hydridocobalt(III) porphyrin to 10-methylacridinium ion in acetonitrile. Tributyltin hydride is also effective for the hydrometallation of alkenes and alkynes with cobalt(III) tetraphenylporphyrin to yield the corresponding organocobalt(III) porphyrins regioselectively. The hydrometallation is suggested to proceed via the hydride transfer from tributyltin hydride to cobalt(III) tetraphenylporphyrin to give the hydridocobalt(III) porphyrin, followed by the hydrogen transfer from hydridocobalt(III) porphyrin to alkenes and alkynes to yield the corresponding organocobalt(III) porphyrins. The regioselectivities are consistent with the stabilities of radicals generated by the hydrogen transfer from hydridocobalt(III) porphyrin to alkenes and alkynes. The rates of the electrophilic cleavage of cobalt-carbon bonds of organocobalt(III) porphyrins by trifluoroacetic acid in MeCN are also reported.
APA, Harvard, Vancouver, ISO, and other styles
2

YUASA, MAKOTO, BEAT STEIGER, and FRED C. ANSON. "Hydroxy-substituted Cobalt Tetraphenylporphyrins as Electrocatalysts for the Reduction of O2." Journal of Porphyrins and Phthalocyanines 01, no. 02 (April 1997): 181–88. http://dx.doi.org/10.1002/(sici)1099-1409(199704)1:2<181::aid-jpp22>3.0.co;2-r.

Full text
Abstract:
The possible effects of the electron-donating properties of p-hydroxyphenyl groups on the catalytic activity of cobalt porphyrins toward the electro-reduction of O 2 were explored with three cobalt porphyrins having p-hydroxyphenyl substituents in the meso position of the porphyrin ring. The porphyrins were examined as electrocatalysts adsorbed on the surfaces of pyrolytic graphite electrodes in aqueous solution and as homogeneous catalysts dissolved in methanolic solutions. The adsorbed molecules exhibited a higher catalytic activity than those in solution and accomplished the reduction of a portion of the O 2 molecules reaching the electrode to H 2 O . However, the four-electron reduction was indirect, with H 2 O 2 being formed as an intermediate that was subsequently reduced. Although the introduction of the electron-donating p-hydroxyphenyl substituents on the porphyrin ring altered the catalytic activity of the cobalt porphyrins, the effect was not as great as can be obtained by coordinating ruthenium (II) complexes to π-accepting ligands in the meso position of the porphyrin ring.
APA, Harvard, Vancouver, ISO, and other styles
3

Khusnutdinova, Diana, Anna M. Beiler, Brian L. Wadsworth, Sylvia K. Nanyangwe, and Gary F. Moore. "Vibrational structure analysis of cobalt fluoro-porphyrin surface coatings on gallium phosphide." Journal of Porphyrins and Phthalocyanines 22, no. 06 (June 2018): 461–66. http://dx.doi.org/10.1142/s1088424618500906.

Full text
Abstract:
Grazing angle attenuated total reflectance Fourier transform infrared (GATR–FTIR) spectroscopy is used to characterize chemically modified gallium phosphide (GaP) surfaces containing grafted cobalt(II) porphyrins with 3-fluorophenyl substituents installed at the meso-positions. In these hybrid constructs, porphyrin surface attachment is achieved using either a two-step method involving coordination of cobalt fluoro-porphyrin metal centers to nitrogen sites on an initially applied thin-film polypyridyl surface coating, or via a direct modification strategy using a cobalt fluoro-porphyrin precursor bearing a covalently bonded 4-vinylphenyl surface attachment group at a [Formula: see text]-position. Both surface-attachment chemistries leverage the UV-induced immobilization of alkenes but result in distinct structural connectivities of the grafted porphyrin units and their associated vibrational spectra. In particular, the in-plane deformation vibrational frequency of metalloporphyrin components in samples prepared via coordination to the polymeric interface is characterized by an eight wavenumber shift to higher frequencies compared to that measured on metalloporphyrin-modified surfaces prepared using the one-step attachment method. The more rigid ring structure in the polymeric architecture is consistent with coordination of porphyrin cobalt centers to pyridyl-nitrogen sites on the surface graft. These results demonstrate the use of GATR–FTIR spectroscopy as a sensitive tool for characterizing porphyrin-modified surfaces with absorption signals that are close to the detection limits of many common spectroscopic techniques.
APA, Harvard, Vancouver, ISO, and other styles
4

Subedi, Dili R., Youngwoo Jang, Ashwin Ganesan, Sydney Schoellhorn, Ryan Reid, Guido F. Verbeck, and Francis D’Souza. "Donor-acceptor conjugates derived from cobalt porphyrin and fullerene via metal-ligand axial coordination: Formation and excited state charge separation." Journal of Porphyrins and Phthalocyanines 25, no. 05n06 (April 17, 2021): 533–46. http://dx.doi.org/10.1142/s1088424621500449.

Full text
Abstract:
Two types of cobalt porphyrins, viz., meso-tetrakis(tolylporphyrinato)cobalt(II), (TTP)Co (1), and meso-tetrakis(triphenylamino porphyrinato)cobalt(II), [(TPA)4P]Co, (2) were self-assembled via metal-ligand axial coordination of phenyl imidazole functionalized fulleropyrrolidine, ImC[Formula: see text] to form a new series of donor–acceptor constructs. A 1:2 complex formation with ImC[Formula: see text] was established in the case of (TTP)Co while for [(TPA)4P]Co only a 1:1 complex was possible to positively identify. The binding constants [Formula: see text] and [Formula: see text] for step-wise addition of ImC[Formula: see text] to (TTP)Co were found to be 1.07 × 105 and 3.20 × 104 M[Formula: see text], respectively. For [(TPA)4P]Co:ImC[Formula: see text], the measured [Formula: see text] values was found to be 6.48 × 104 M[Formula: see text], slightly smaller than that observed for (TTP)Co. Although both cobalt porphyrins were non-fluorescent, they were able to quench the fluorescence of ImC[Formula: see text] indicating occurrence of excited state events in the supramolecular donor-acceptor complexes. Electrochemistry coupled with spectroelectrochemistry, revealed the formation of cobalt(III) porphyrin cation instead of a cobalt(II) porphyrin radical cation, as the main product, during oxidation of phenyl imidazole coordinated cobalt porphyrin. With the help of computational and electrochemical results, an energy level diagram was constructed to witness excited state photo-events. Competitive energy and electron transfer from excited CoP to coordinated ImC[Formula: see text], and electron transfer from Im1C[Formula: see text]* to cobalt(II) porphyrin resulting into the formation of PCo[Formula: see text]:ImC[Formula: see text] charge separated state was possible to envision from the energy diagram. Finally, using femtosecond transient absorption spectroscopy and data analysis by Glotaran, it was possible to establish sequential occurrence of energy transfer and charge separation processes. The lifetime of the final charge separated state was [Formula: see text] 2 ns. A slightly better charge stabilization was observed in the case of [(TPA)4P]Co:ImC[Formula: see text] due to the presence of electron rich, peripheral triphenylamine substituents on the cobalt porphyrin.
APA, Harvard, Vancouver, ISO, and other styles
5

YUAN, HONGPING, and L. KEITH WOO. "Synthesis and Characterization of Thiol-Derivatized Porphyrins and Metalloporphyrin complexes." Journal of Porphyrins and Phthalocyanines 01, no. 02 (April 1997): 189–200. http://dx.doi.org/10.1002/(sici)1099-1409(199704)1:2<189::aid-jpp23>3.0.co;2-g.

Full text
Abstract:
A series of thiol-derivatized porphyrins and the corresponding cobalt and zinc complexes were synthesized from 5-(p-aminophenyl)-10,15,20-triphenylporphyrin ( H 2 TPP - NH 2), and 5α,15α-bis(o-aminophenyl)porphyrin ( H 2 DPE - ( NH 2)2). These derivatized porphyrins have a different number of thiol appendages attached via amide linkages at different locations. The thiol-derivatized porphyrins made from H 2 TPP - NH 2, H 2 TPP - NHC ( O )( CH 2) n SH ( n = 2, 4, 5, 10), have one alkyl-thiol appendage attached to the porphyrin through an amide linkage on the p-aminophenyl position. The derivatives made from H 2 DPE -( NH 2)2 have two alkyl-thiol appendages attached to the porphyrin through amide linkages on the o-aminophenyl positions on the same face of the porphyrin ring. These thiol-derivatized porphyrins are important adsorbates for the preparation of thiol–porphyrin monolayers on gold.
APA, Harvard, Vancouver, ISO, and other styles
6

Glazkova, Maria Е., Тatiana А. Аgeeva, Yuliya S. Rodina, and Oscar I. Koifman. "SPECTRAL INVESTIGATIONS OF COBALT PORPHYRINATES INTERACTION WITH RADICAL POLYMERIZATION INITIATORS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 5 (May 21, 2019): 91–96. http://dx.doi.org/10.6060/ivkkt.20196205.6029.

Full text
Abstract:
The article presents the results of the kinetics study of the cobalt porphyrins interaction with radical polymerization initiators – benzoyl peroxide and lauryl peroxide – in solution by the spectrophotometric method. From disparate literature data, it is known that some metalloporphyrins can interact with benzoyl peroxide to form the tautomers of porphyrins – isoporphyrins. These compounds have a number of specific properties, for example, it can be catalysts of various processes. Perhaps the isoporphyrins formation is the reason for high activity of the initiating systems “cobalt porphyrin – benzoyl peroxide” in the polymerization of vinyl monomers. Cobalt(II)complexes of tetraphenylporphyrin, tetra-para-methoxyphenylporphyrin, 5,15-bis(4´-tert-butylphenyl)-3,7,13,17-tetramethyl-2,8,12,18-tetra-p-butylporphyrin were selected as the objects of this study. The influence of the porphyrin ligand structure on the formation of cobalt isoporphyrins was estimated. The interaction of cobalt (II) tetraphenylporphyrin and cobalt (II) tetra-para-methoxyphenylporphyrin with peroxides showed changes in the electronic absorption spectra of metalloporphyrins: deformation of the Soret band, reduction of the absorption band in the visible region, and the appearance of absorption bands in the near IR region. These changes are characteristic for metalloisoporphyrins. Data on the interaction of cobalt porphyrins with lauryl peroxide were obtained for the first time. The formation of isoporphyrins is possible with the different ratio of concentrations of reagents: with a lack of peroxide, with equimolar ratio, and also with a significant (100-fold) excess of peroxide. When 5,15-bis (4´-tert-butylphenyl)-3,7,13,17-tetramethyl-2,8,12,18-tetra-p-butylporphyrinate cobalt (II) reacted with peroxides, no isoporphyrinates were observed. The article presents the effective reaction rate constants of the cobalt isoporphyrinates formation at 25 °C. It is shown that the structure of both cobalt porphyrinates and organic peroxides affects the possibility and rate of isoporphyrins formation.
APA, Harvard, Vancouver, ISO, and other styles
7

Barbe, Jean-Michel, Fabien Burdet, Enrique Espinosa, Claude P. Gros, and Roger Guilard. "New insights into the synthesis of porphyrin-corrole and biscorrole systems." Journal of Porphyrins and Phthalocyanines 07, no. 05 (May 2003): 365–74. http://dx.doi.org/10.1142/s1088424603000471.

Full text
Abstract:
As in the case of porphyrins, the relatively easier synthesis of meso-substituted corroles compared to that of β-pyrrole substituted ones greatly limits the use of these latter derivatives. Here we show, for the synthesis of β-substituted biscorrole and porphyrin-corrole dyads, that a simple replacement of sodium hydrogen carbonate by sodium acetate in the final cyclisation step of the a,c-biladiene to the corrole ring, increases the yield by at least a factor of 3. This reaction can be extended to the synthesis of β-substituted monocorroles. Moreover, when cobalt acetate is added instead of the reoxidation step, a 34 to 63% yield in porphyrin-spacer- Co ( III ) corrole is obtained, thus avoiding isolation of the free-base and further metalation of this latter derivative. This “cyclisation-oxidation-metalation” reaction is of particular interest in the preparation of heterobimetallic species in porphyrin-corrole series. Indeed, it leads to the formation of the monocobalt derivative with the cobalt atom inside the corrole moiety allowing for the further insertion of a large variety of metals into the porphyrin macrocycle. Crystals of the monocobalt complex of a biphenylene bridged porphyrin-corrole derivative were obtained in the presence of pyridine and the structure was determined by X-ray diffraction analysis. The structure shows that only one pyridine molecule is bound to the cobalt centre in an exo position, thus indicating a strong steric hindrance from the porphyrin counterpart.
APA, Harvard, Vancouver, ISO, and other styles
8

Carlucci, Lucia, Gianfranco Ciani, Simona Maggini, Davide M. Proserpio, Fabio Ragaini, Emma Gallo, Marco Ranocchiari, and Alessandro Caselli. "Synthesis and characterization of new tetra-substituted porphyrins with exo-donor carboxylic groups as building blocks for supramolecular architectures: Catalytic and structural studies of their metalated derivatives." Journal of Porphyrins and Phthalocyanines 14, no. 09 (September 2010): 804–14. http://dx.doi.org/10.1142/s1088424610002641.

Full text
Abstract:
We report herein the synthesis of the porphyrins 5,10,15,20-tetrakis(4-carboxybiphenyl)-porphyrin (H2TCBP) and 5,10,15,20-tetrakis(4-carboxy-2,6-dimethylbiphenyl)porphyrin (H2TCDMBP) bearing diphenyl units on meso-positions, and of their cobalt and silver derivatives. The silver complexes of H2TCDMBP and of H2TCPP ( H2TCPP = 5 ,10,15,20-tetrakis(4-carboxyphenyl)porphyrin) were investigated by X-ray crystallography and their supramolecular organization elucidated. Co(TCBP) was reacted with copper formate, yielding a polymeric compound that showed a catalytic activity in the benzylic amination of hydrocarbons using arylazide as aminating agent.
APA, Harvard, Vancouver, ISO, and other styles
9

D'SOUZA, FRANCIS, YI-YING HSIEH, and G. R. DEVIPRASAD. "Electrochemical and Spectroelectrochemical Characterization of Water-soluble, β-Pyrrolebrominated Cobalt Porphyrins." Journal of Porphyrins and Phthalocyanines 02, no. 05 (October 1998): 429–37. http://dx.doi.org/10.1002/(sici)1099-1409(199807/10)2:4/5<429::aid-jpp117>3.0.co;2-8.

Full text
Abstract:
The electrochemical and spectroelectrochemical characterization of two water-soluble porphyrins, namely the tetrachloro salt of cobalt(II) tetrakis-(N-methyl pyridyl)-β-octabromoporphyrin, [( Br 8 TMPyP ) Co II] Cl 4, and the tetrasodium salt of cobalt(II) tetrakis-(4-sulfonatophenyl)-β-octabromoporphyrin, Na 4[( Br 8 TPPS ) Co II], under different pH conditions is reported. The investigated porphyrins are highly non-planar and electron-deficient owing to the presence of eight bromides at the β-pyrrole positions and the four meso-aryl substituents. The redox potentials corresponding to the first oxidation and first reduction are shifted positively compared with the redox potentials of the respective unbrominated porphyrin derivatives. Spectroelectrochemical studies reveal the formation of a cobalt(III) complex during the first oxidation of both cobalt porphyrins. The first reduction of Br 8 TPPS ) Co II]4− results in a cobalt(I) complex, while involvement of the peripheral N-methyl pyridyl groups in the case of Br 8 TMPyP ) Co II]4+ is suggested. The peak potentials of the first oxidation corresponding to a Co II/ Co III redox couple of both investigated compounds are found to be pH-dependent. Debromination of the β-pyrrole bromo substituents of Br 8 TMPyP ) Co II]4+ at more negative potentials is observed. The UV-vis spectrum obtained after bulk electrolysis of Br 8 TMPyP ) Co II]4+ at −1.0 V vs Ag / AgCl followed by reoxidation at 0.2 V indicates complete elimination of the bromo substituents of the porphyrin periphery.
APA, Harvard, Vancouver, ISO, and other styles
10

Intrieri, Daniela, Sergio Rossi, Alessandra Puglisi, and Emma Gallo. "Metal-porphyrin catalyzed aziridination of α-methylstyrene: Batch vs. flow process." Journal of Porphyrins and Phthalocyanines 21, no. 04-06 (April 2017): 381–90. http://dx.doi.org/10.1142/s1088424617500365.

Full text
Abstract:
This work describes the aziridination process of [Formula: see text]-methylstyrene by using electron poor aromatic azides in the presence of metal-based porphyrins as catalysts. Different ruthenium and cobalt-based porphyrins were successfully employed for the synthesis of [Formula: see text]-aryl aziridines performed under a traditional batch methodology and under continuous flow conditions. In general, yields obtained using ruthenium-based catalysts in a traditional batch process were higher than those observed when the reaction was performed under flow conditions. However, cobalt-based porphyrins showed better activities and short reaction times when employed in a flow system process. DFT calculations were also performed in order to understand the influence of substituents on the porphyrin ring in the aziridination process.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Cobalt porphyrin"

1

Medforth, C. J. "Cobalt (III) porphyrin N.M.R. shift reagents." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384368.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Joshua, Warren A. C. "Reactions of some cobalt and rhodium complexes of macrocyclic N-donor ligands." Thesis, Kingston University, 1991. http://eprints.kingston.ac.uk/20551/.

Full text
Abstract:
This thesis is principally concerned with the interaction of cobalt porphyrin complexes with halocarbons. There have been no previous studies of these, despite the afct that the ability to readily introduce substituents into the porphyrin ligand makes it ideal for inducing subtle electronic and steric changes into the complexes. The reactions of various substituted cobalt tetraphenylporphyrins with halocazbons was studied. Three series of experiments were performed involving activation by heat, visible light and ultraviolet light. Products were characterized by electronic, nmr and mass spectrometry. The five coordinate complexes, [CoX (Por)] , obtained from thermally activated reactions and those performed with uv irradiation under nitrogen, proved particularly difficult to characterize since they are subject to disproportionation giving paramagnetic products. This aspect is discussed in detail and the results obtained allow clarification of conflicting reports in the literature. A qualitative investigation of relative reaction rates has led to the tentative suggestion that thermal reactions proceed by an electron transfer mechanism, whereas an atom abstraction mechanism applies to reactions involving activation by ultraviolet light. No reaction took place between cobalt porphyrins and the substrates in the presence of visible light. Aerobic ultraviolet radiation results in the formation of cobalt porphyrin [pi]-cation radicals with either a1u or azU. ground states, depending on the substituent pattern of the porphyrin. The cobalt porphyrins were all shown to possess catalytic activity for halocarbon-alkene addition reactions. Furthermore, studies in this area suggest that the catalytic activity could be correlated wíth the substituent pattern on the porphyrin ligand and, thus, complements the studies described above. A related rhodium complex was also synthesized and examined but was shown to have a disappointingly low catalytic activity. Products of [RuC1[sub]2z(PPh[sub]3)[sub]3] -catalysed additions of halocarbons to cyclohexa-1,3-diene were investigated by chromatographic and spectroscopic analyses to ascertain the stereochemistry of the products. The ratio of the two isomeric products was found to depend on steric effects of the addend groups, CX[sub]3 (X = Cl, Br) and X (X = Cl, Br).
APA, Harvard, Vancouver, ISO, and other styles
3

Wang, Weilong. "Application of a cobalt porphyrin as catalyst in microbial fuel cells." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398947294.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Tao, Jingran. "Asymmetric Nitrene Transfer Reactions with Azides via Co(II)-Based Metalloradical Catalysis (MRC)." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4590.

Full text
Abstract:
Asymmetric nitrene transfer reactions via metalloradical catalysis (MRC) with azides has attracted research interest because of its fundamental and practical importance. The resulting nitrogen-containing units are recurrent motifs in biologically important molecules and can serve as versatile precursors in organic synthesis. The [Co(D2-Por*)] have emerged as a new class of catalysts for asymmetric aziridination and C-H amination. These metalloradical catalysts have been shown to be highly effective for the asymmetric intermolecular aziridination of a broad scope of substrates with different classes of azides with excellent to good enantioselectivity. The intramolecular C-H amination utilizing various azides can allow for the construction of diverse nitrogen containing heterocyclic compounds.
APA, Harvard, Vancouver, ISO, and other styles
5

Lizardi, Christopher Lee. "Aldehydic C-H Amination Reactions via Co(II)-Based Metalloradical Catalysis and Construction of Novel Chiral meso-Amidoporphyrin Ligands." Scholar Commons, 2015. https://scholarcommons.usf.edu/etd/5526.

Full text
Abstract:
Medium-sized organic ring synthesis poses a seemingly insurmountable challenge, and because of this it is a field under immense investigation. Heterocyclic containing medium-sized rings are common structural motifs in nature, which has caused researchers to investigate their potential biological activity and properties as materials. This research focused on the grand challenge of medium-sized heterocyclic ring synthesis, providing the synthesis community with new tools to generate these highly evasive products, while elucidating energetic and geometric properties of one of Nature's least understood organic ring systems. Cobalt(II)-Amidoporphyrins, [Co(D2-Por)], are an emerging class of metalloradical catalysts (MRC) which can facilitate a wide range of atom and group transfer reactions. A strategy was employed using [Co(D2-Por)] to carry out an intramolecular C-H amination reaction using sulfamoyl azides as the radical nitrene source to aminate the highly reactive aldehydic C-H bond. This newfound reaction allowed for the generation of previously unobtainable medium-sized heterocycles, which surprisingly provided a racemic mixture of chiral medium-sized rings. A wide array of chiral amidoporphyrins including meso-heteroatom containing porphyrins were synthesized as well during the course of research to probe their potential as new chiral ligands for the emerging field of cobalt(II)-amidoporphyrin catalyzed MRC system. A practical synthetic scheme was discovered employing the highly selective Zn(II)-bromoporphyrin synthon to generate a new library of chiral amidoporphyrin ligands for the MRC system through well-established cross-coupling methodologies.
APA, Harvard, Vancouver, ISO, and other styles
6

Houwaart, Torsten. "Cobalt porphyrins on coinage metal surfaces - adsorption and template properties." Thesis, Lyon, École normale supérieure, 2014. http://www.theses.fr/2014ENSL0927.

Full text
Abstract:
Cette thèse est une étude théorique sur la interface de porphyrine de cobalt avec des surfaces métalliques avec le code VASP DFT. Le cadre DFT nécessaire a été introduit dans le chapitre 1. La structure de la jBardeen, une programme ecrit en Java, pour la simulation de la STM est expliqué dans le chapitre 2 et le code source est jointe en annexe. Une étude de l'adsorption de CoTPP sur les surfaces métalliques a été entrepris dans le chapitre 3. Différents paramètres de calcul ont été évalués: Le site d'adsorption et de la géométrie à la fois la molécule et la surface ont été étudiés par rapport à la xc-fonctionnel et correction de la dispersion utilisée. Une adsorption site le plus stable est identifié. Par conséquent, ce site plus stable a été étudiée pour sa structure électronique. Calculés images STM avec le code jBardeen ont été comparés avec une experimentation de CoTPP Cu sur une surface (111) avec une couverture sous monocouche. Dans le chapitre 4, un adatome Fe a été présenté à la CoTPP sur Ag système (111). Trois sites de liaison symétrique différentes pour l'atome Fe ont été identifiés sur le macrocycle, marqué les , bi-, brd- et bru-positions. Un moment magnétique pouvait être attestée qui a été principalement situé sur l'atome Fe. Voies possibles entre les quatre, symétriquement équivalentes, sites bi- ont été étudiées avec des méthodes différentes. Simples calculs dans le vacuum et calculs de la “Nudged Elastic Band” (NEB) de l'ensemble du système a révélé une hauteur de barrière légèrement au-dessus de 0,2 eV allant de position bi à la posititon brd. Une analyse de vibration a montré que la commutation de l'atome Fe est susceptible, lorsqu'il est perturbé hors d'équilibre dans les positions brd et bru
This thesis is a theoretical study on the cobalt porphyrin - coinage metal surface interface with the DFT code VASP. The necessary DFT framework has been introduced in chapter 1. The structure of the Java program jBardeen for STM simulation is explained in chapter 2 and the source code is attached as Appendix. A study of the adsorption of CoTPP on coinage metal surfaces has been undertaken in chapter 3. Different parameters of the calculation have been evaluated: the adsorption site and the geometry of both the molecule and surface have been investigated with respect to the xc-functional and dispersion correction used. A most stable adsorption site -bridge down- is identified. Consequently, this most stable site was investigated for its electronic structure. Calculated STM images with the jBardeen code were compared with an experiment of CoTPP on a Cu(111) surface with sub monolayer coverage. In chapter 4 an Fe adatom was introduced to the CoTPP on Ag(111) system. Three symmetrically different binding sites for the Fe atom were identified on the macrocycle, labelled the bi-, brd- and bru-positions for bisector, bridge down and bridge up respectively. A magnetic moment could be evidenced which was mainly located on the Fe atom. Possible pathways between the four symmetrically equivalent bisector sites were investigated with different methods. Single point calculations in vacuum and Nudged Elastic Band (NEB) of the whole system revealed a barrier height of slightly above 0.2 eV going from bi- to the brd-position. A vibrational analysis showed that switching of the Fe atom is likely, when perturbed out of equilibrium in the brd- and bru- positions
APA, Harvard, Vancouver, ISO, and other styles
7

Xu, Xue. "Asymmetric Intra- and Intermolecular Cyclopropanation by Co(II)- Based Metalloradical Catalysis." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4262.

Full text
Abstract:
Metal-catalyzed cyclopropanation of olefins with diazo reagents has attracted research interest because of its fundamental and practical importance. The resulting cyclopropyl units are recurrent motifs in biologically important molecules and can serve as versatile precursors in organic synthesis. Since they were first introduced in 2004, Co(II) complexes of D2-symmetric chiral amidoporphyrins [Co(D2-Por*)] have emerged as a new class of catalysts for asymmetric cyclopropanation. These metalloradical catalysts have been shown to be highly effective for asymmetric intermolecular cyclopropanation of a broad scope of substrates with different classes of carbene sources, particularly including electron-deficient olefins and acceptor/acceptor-substituted diazo reagents, with excellent diastereoselectivity and enantioselectivity. This dissertation focuses on exploring the Co(II)-based metalloradical catalyzed enantioselective cyclization reactions. It includes expanding families of catalysts, types of reactions and classes of substrates. With the developed novel approach for chiral porphyrin ligands, a new family of catalysts bearing different electronic and steric characters was synthesized. They turned out to be better catalysts for metalloradical cyclization in many cases, for instance, enantioselectivity of intramolecular cyclopropanation reached up to 99% with new catalyst. Besides the catalyst synthesis, more challenging diazo reagents were successfully employed in both intra- and intermolecular cyclopropanation for direct synthesis of highly functionalized cyclopropanes. Moreover, a tandem radical cyclization process beyond cyclopropanation was discovered, dihydrofuran was generated in a highly selective manner. Last but not least, we developed some novel applications of cyclopropane products, which could potentially lead to more exciting works.
APA, Harvard, Vancouver, ISO, and other styles
8

Xia, Wei [Verfasser], Bernhard [Akademischer Betreuer] Rieger, and Thomas F. [Akademischer Betreuer] Fässler. "Cobalt Porphyrin Catalysts Utilised in the Copolymerisation of CO2 and Propylene Oxide / Wei Xia. Gutachter: Thomas F. Fässler ; Bernhard Rieger. Betreuer: Bernhard Rieger." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1071370049/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Ledung, Greger. "Heterogenization of a Cobalt Porphyrin Catalyst Investigated by Scanning Probe Microscopy and X-Ray Photoelectron Spectroscopy: The Effect on Catalysis of Oxidation Reactions." Doctoral thesis, Västerås : School of sustainable Development of Society and technology, Mälardalen university, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-492.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ladd, Richard Maurice. "Synthesis of the zinc and cobalt derivatives of meso-(4-sulphonatophenyl)-porphyrin for use as diamagnetic shift reagents in nuclear magnetic resonance studies." Thesis, Manchester Metropolitan University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238379.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Cobalt porphyrin"

1

Smith, Kevin M., Roger Guilard, and Karl Kadish. Porphyrin Handbook : The Iron and Cobalt Pigments: Biosynthesis, Structure and Degradation. Elsevier Science & Technology Books, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

The Porphyrin Handbook, Volumes 11-20, Volume 12: The Iron and Cobalt Pigments: Biosynthesis, Structure and Degradation (The Porphyrin Handbook). Academic Press, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

(Editor), Karl Kadish, Kevin M. Smith (Editor), and Roger Guilard (Editor), eds. The Porphyrin Handbook, Volumes 11-20, Volume 12: The Iron and Cobalt Pigments: Biosynthesis, Structure and Degradation (The Porphyrin Handbook). Academic Press, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Cobalt porphyrin"

1

Dobhal, M. P. "Spectral data of cobalt complex of porphyrin derivative C52H65CoN6O14." In Porphyrins - Spectral Data of Porphyrin Isomers and Expanded Porphyrins, 396–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47224-8_211.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Dobhal, M. P. "Spectral data of cobalt complex of porphyrin derivative C52H65CoN6O15." In Porphyrins - Spectral Data of Porphyrin Isomers and Expanded Porphyrins, 398–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47224-8_212.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Dobhal, M. P. "Spectral data of cobalt complex of porphyrin derivative C52H67CoN6O14." In Porphyrins - Spectral Data of Porphyrin Isomers and Expanded Porphyrins, 400–401. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47224-8_213.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Dobhal, M. P. "Spectral data of cobalt complex of porphyrin derivative C54H67CoN6O16." In Porphyrins - Spectral Data of Porphyrin Isomers and Expanded Porphyrins, 459–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47224-8_245.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Dobhal, M. P. "Spectral data of cobalt complex of porphyrin derivative C54H69CoN6O16." In Porphyrins - Spectral Data of Porphyrin Isomers and Expanded Porphyrins, 463–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47224-8_247.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gupta, R. "Spectral data of cobalt complex of porphyrin derivative C76H108Co4CuN24O16." In Porphyrins, 280–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49340-3_144.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Gupta, R. "Spectral data of cobalt complex of porphyrin derivative C76H110Co4N24O16." In Porphyrins, 284–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49340-3_146.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Gupta, R. "Spectral data of cobalt complex of porphyrin derivative C80H64CoF6N8O12P." In Porphyrins, 306–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49340-3_157.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Gupta, R. "Spectral data of cobalt complex of porphyrin derivative C85H66F4HoN4O14." In Porphyrins, 409–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49340-3_213.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Gupta, R. "Spectral data of cobalt complex of porphyrin derivative C58H46CoF6N6Sb." In Porphyrins, 52–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49340-3_22.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Cobalt porphyrin"

1

Zhang, Congxiao, Yunjing Luo, Xufeng Song, Yuanbin She, and Zhiguo Han. "Kinetics of Tetra-(p-Carboxyphenyl) Cobalt Porphyrin Chloride Reactions with Peroxynitrite." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5518315.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Mondal, Rajkumar, and Utpal Sarkar. "Electron transport property of cobalt-centered porphyrin-armchair graphene nanoribbon (AGNR) junction." In NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4918069.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Lee, Kyounghoon, Dae-Hyun Baek, and Jongbaeg Kim. "Fabrication and characterization of VOC sensors based on suspended zinc oxide nanorods functionalized by cobalt porphyrin." In 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS). IEEE, 2017. http://dx.doi.org/10.1109/transducers.2017.7994050.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Molla, Md Zaman, Shyam S. Pandey, Yuhei Ogomi, Tingli Ma, and Shuzi Hayase. "Transparent conductive oxide-less back contact dye-sensitized solar cells using Zinc porphyrin dye employing cobalt complex redox shuttle." In 2014 IEEE 40th Photovoltaic Specialists Conference (PVSC). IEEE, 2014. http://dx.doi.org/10.1109/pvsc.2014.6925209.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Arshad, Syariena, Muhammad Mat Salleh, and Muhammad Yahaya. "The Effect of Surface Microstructure on The Response of Titanium Dioxide Coated with Cobalt-Porphyrin Thin Films Towards Gases in Quartz Crystal Microbalance Sensor." In 2006 IEEE International Conference on Semiconductor Electronics. IEEE, 2006. http://dx.doi.org/10.1109/smelec.2006.381065.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Rahimi, Rahmatollah, Hossein Ghafuri, Zahra Movahedinia, and Solmaz Zargari. "Synthesis and Characterization of 5,10,15,20-Tetrakis(4-Tolyl)Porphyrin and its Tin and Cobalt Complexes: Investigation of their Photodynamic Properties in Degradation of Methylene Blue." In The 18th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2014. http://dx.doi.org/10.3390/ecsoc-18-a027.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Cobalt porphyrin' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography