Co(II)-porphyrin catalysts have good thermal and metal coordination stability resulting from the macrocyclic chelation effect of the aromatic ligand. (wikipedia.org)
Co(II)-porphyrin catalysts lack vacant cis-coordination sites available (all occupied). (wikipedia.org)
Together, these advantages provide Co(II)-porphyrin catalysts with high catalytic selectivities and turnover numbers. (wikipedia.org)
Gharaati Shadab, Moghadam Majid, Tangestaninejad Shahram, Mirkhani Valiollah, Mohammadpoor-Baltork Iraj, Barati Behjat, Sadegh Faranak: High-valent tin(IV) porphyrins: Efficient and selective catalysts for cyclopropanation of styrene derivatives with EDA under mild conditions. (iupac.org)
Synthesis3
Key steps in the synthesis are the introduction of a phenyl group to the β-position of pyrrole by Suzuki coupling, followed by condensation and decarboxylation to give dipyrrylmethane, which was then condensed with 3-(triisopropylsilyl)propynal to create the double fence porphyrin core. (chemistryviews.org)
The stability and versatile applications of porphyrins inspired the synthesis of derivatives including 5,10,15,20-tetrakis(N-methyl pyridinium-4-yl)porphyrin (TMPyP) that is the object of the present chapter. (intechopen.com)
Herein, we extended our research to the synthesis of a new nanomagnet-porphyrin hybrid with a CoFe2O4 core (hybrid 7) and we studied, for the first time, the recycling and reuse capability of this type of hybrids in water contaminated with bacteria. (ua.pt)
Catalytic3
Stable metalloradicals such as Co-porphyrin catalysis activate diazo reagents and organic azides to generate C- and N-centered radicals, respectively, with nitrogen as the only byproduct in a controlled and catalytic manner. (wikipedia.org)
In synthetic porphyrins such as TMPyP, the catalytic and photochemical properties can be achieved by the coordination with a diversity of central metal ions. (intechopen.com)
The catalytic properties of porphyrins and related compounds such as the hemeproteins are also applicable in the fabrication of micro-/nanomotors (MNMs). (intechopen.com)
Photosensitizers1
In photodynamic therapy (PDT), TMPyP and other porphyrins act as photosensitizers. (intechopen.com)
Organic2
Due to their distinctive radical mechanisms that involve metal-stabilized radical intermediates, such as α-metalloalkyl radicals, α-metalloaminyl radicals, and α-metalloxyl radicals, the Co(II)-porphyrin-based catalysis system addresses some long-standing challenges in organic transformations. (wikipedia.org)
The most efficient DSSCs are based on cobalt electrolytes in combination with porphyrins or organic dyes as sensitizers. (chemistryviews.org)
Radicals2
The initially formed C- and N-centered radicals can undergo common radical reactions such as radical addition and atom abstraction, but with effective control of reactivity and stereoselectivity by the porphyrin ligand environment. (wikipedia.org)
Oral photoprotection can be achieved with free radical scavengers, thereby reducing free radicals, singlet oxygen formation, and the photosensitizing effect of porphyrins. (medscape.com)
Molecules4
Individual molecules in porphyrin or phthalocyanine thin films are able to oxidize cobalt atoms into formal Co(II) species. (uni-marburg.de)
Moreover, multilayer metalation of 2HTPP molecules with deposited cobalt atoms is investigated in detail by both laboratory X-ray source (XPS) and synchrotronbased hard X-rays (HAXPES). (uni-marburg.de)
The association of porphyrins with different surfaces modulates the electronic and physicochemical properties of these molecules. (intechopen.com)
Porphyrins have the property of half-metallic material, i.e., molecules that can host transition metals making feasible the production of spin-polarized electronic states at different channels. (intechopen.com)
Catalyst1
Cobalt(II)-porphyrin catalysis is a process in which a Co(II) porphyrin complex acts as a catalyst, inducing and accelerating a chemical reaction. (wikipedia.org)
Solar Cells1
The photochemical properties of TMPyP and other porphyrins are also useful for the fabrication of solar cells. (intechopen.com)
Modification1
X. Peter Zhang's group have accomplished porphyrin modification by using palladium-catalyzed coupling processes of chiral amides on bromoporphyrin templates. (wikipedia.org)
Processes1
The vital role played by porphyrins in cells and their use in therapeutic processes are well known. (intechopen.com)
Laboratory1
Stool porphyrin levels that are combined with other laboratory values and clinic correlation help guide the diagnosis. (medscape.com)
IRON1
Porphyrins are tetrapyrrole macrocycles that can coordinate transition metal ions such as iron, cobalt and magnesium and are able to perform a diversity of functions and applications. (intechopen.com)
Complex2
Third, it has been well documented that the physical and chemical properties of a porphyrin complex of a given metal ion can be systematically tuned by introducing peripheral substituents with varied electronic, steric, and conformational environments on the aromatic ring structure of the porphyrin ligand. (wikipedia.org)
Besides the interfacial chemical bond, i.e., between the surface and the metal complex, secondary effects - such as charge transfer and weak band bending - are characterized in detail for cobalt phthalocyanine adsorbed on Cu(111). (uni-marburg.de)
Provide1
The double fence porphyrin dyes provide a higher PCE (up to 10.69 %) than single fence analogues (3.48 %) or the benchmark dye YD2- o -C8 (9.83 %) under similar conditions. (chemistryviews.org)
Application1
Manipulation of the interfacial confinement properties is one of the newest application areas of porphyrins. (intechopen.com)
Ligand2
Third, it has been well documented that the physical and chemical properties of a porphyrin complex of a given metal ion can be systematically tuned by introducing peripheral substituents with varied electronic, steric, and conformational environments on the aromatic ring structure of the porphyrin ligand. (wikipedia.org)
The initially formed C- and N-centered radicals can undergo common radical reactions such as radical addition and atom abstraction, but with effective control of reactivity and stereoselectivity by the porphyrin ligand environment. (wikipedia.org)
Pigment1
Vitamin B12 is actually a red porphyrin pigment. (davidwolfe.com)
Conformational1
An important characteristic of porphyrins is their conformational flexibility. (mytum.de)
Pathway2
Analysis of the Co/O 2 binding stoichiometry and kinetic studies support an O 2 reduction pathway involving a mononuclear cobalt species. (acs.org)
An outline of the porphyrin pathway reveals the pathophysiological mechanisms that cause porphyria. (medscape.com)
Bind1
Porphyrin levels can be reduced by direct methods or with medications that bind porphyrins. (medscape.com)
Mechanisms1
When investigating these binding mechanisms, scientists use porphyrin rings with a central cobalt or iron atom. (mytum.de)
Nickel3
Nickel porphyrins are among the most commonly used building blocks for the construction of porphyrin-based architectures, as the diamagnetic nickel allows the ready characterization by NMR spectroscopy. (chemistryviews.org)
However, nickel-based porphyrins are not useful for photophysical investigations as their photoexcited states decay to the ground state in a matter of picoseconds. (chemistryviews.org)
Atsuhiro Osuka and his group, Kyoto University, Japan, have found that treatment of nickelporphyrins with the Grignard reagent 4-methylphenylmagnesium bromide in specific solvents, results in smooth transmetalation of magnesium for nickel. (chemistryviews.org)
Copper1
For example, zinc, copper, and silver porphyrins also underwent a Grignard reaction to give the corresponding magnesium porphyrins, but unfortunately this methodology is not applicable to cobalt and palladium. (chemistryviews.org)
Iron3
Following this very principle, a porphyrin ring with a central iron or cobalt atom that the poisonous gas attaches to can be used to implement sensors to warn against carbon monoxide. (mytum.de)
Cis-dicarbonyl binding at cobalt and ironporphyrins with saddle-shape conformation, Knud Seufert, Marie-Laure Bocquet, Willi Auwärter, Alexander Weber-Bargioni, Joachim Reichert, Nicolás Lorente und Johannes V. Barth, Nature Chemistry, Online 9. (mytum.de)
Hemes (ironporphyrins) are involved in a range of functions in biology, including electron transfer, small-molecule binding and transport, and O2 activation. (bvsalud.org)
Metal3
Despite its importance for applications, the investigation of the structure and binding of porphyrins on semiconducting and, notably, metal oxide surfaces remains scarce [3-13] . (beilstein-journals.org)
Nevertheless, the demetalation of a variety of metal porphyrins, which is normally achieved only in very strongly acidic conditions, can now be performed much more easily. (chemistryviews.org)
The delocalization of the Fe d-electrons into the porphyrin ring and its effect on the redox chemistry and reactivity of these systems has been difficult to study by optical spectroscopies due to the dominant porphyrin pi-->pi(*) transitions, which obscure the metal center. (bvsalud.org)
Atom1
As expected, this binds directly to the central atom, though only a single molecule fits in each porphyrin ring. (mytum.de)
Effect1
The findings demonstrate the guiding effect of the cobalt oxide films of different thickness and the effect of functional surface anchoring. (beilstein-journals.org)
Range1
A family of unique D2-symmetric chiral porphyrins are effective in a range of stereodefined transformations. (wikipedia.org)