Catalysis-chemistry

Luminescence of porphyrins and metalloporphyrins. Part 11. Energy transfer in zinc-metal-free porphyrin dimers was written by Brookfield, Ralph L.;Ellul, Henriette;Harriman, Anthony;Porter, George. And the article was included in Journal of the Chemical Society, Faraday Transactions 2 in 1986.Application of 57412-08-5 The following contents are mentioned in the article:

A series of covalently linked Zn-H₂ porphyrin dimers (ZnP-H₂P’) was synthesized. The linkage consists of a flexible alkoxy chain of variable length. Absorption spectroscopy shows that there is some exciton coupling between the 2 porphyrin rings, whereas fluorescence spectroscopy shows that the ZnP unit transfers singlet-state excitation energy to the H₂P’. Time-resolved fluorescence studies showed that the dimers exist in solution in different, nonequilibrating conformations. A partially closed form permits reasonably close approach of the 2 porphyrin rings so that Foerster energy transfer is efficient. In a fully extended form, the 2 porphyrins are held too far apart for energy transfer to compete effectively with nonradiative decay of the ZnP excited singlet state. Triplet energy transfer is not observed, owing to unfavorable orientations for exchange coupling, and redox ion intermediates are not seen, even in polar solvent. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Application of 57412-08-5).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Ligands are classified based on the number of lone pair electrons available for the central metal atom, size and charge like anionic, cationic, neutral, monodentate, bidentate, polydentate ligands. The ability of ligands to engender a variety of useful properties of organometallic complexes is the major enabling force for the discovery of new catalytic reactions, activation of small molecules, dramatically enhanced reactivity.Application of 57412-08-5

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthesis, characterization, and variable-temperature ¹H- and ¹⁹F-NMR investigations of cerium(IV) double-deckers derived from monofunctionalized tetraarylporphyrins was written by Buchler, Johann W.;Eiermann, Volker;Hanssum, Helmut;Heinz, Georg;Rueterjans, Heinz;Schwarzkopf, Markus. And the article was included in Chemische Berichte in 1994.Application In Synthesis of 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol The following contents are mentioned in the article:

The synthesis of a Ce(V) bisporphyrinate 1b starting from p-(hydroxyphenyl)tris(p-tolyl)porphyrin 2b is described. Derived from 2b by substitution of the phenolic OH group, the monofunctionalized tetraarylporphyrins 2c–f and their Ce(IV) sandwich complexes 1c–f were synthesized. The complexes are characterized by UV/visible, IR, and ¹H-NMR spectroscopy. ¹⁹F-NMR spectra of 1f show a vicinal and a transversal isomer due to the rigid square-antiprismatic coordination geometry of Ce(IV) bisporphyrinates. Variable-temperature ¹H- and ¹⁹F-NMR spectra were recorded to study the rotational rigidity of the double-decker system. The spectra show that the vicinal and transversal isomers are stable up to 140¡ã, i.e. rotation of the 2 porphyrin macrocycles with respect to each other does not occur. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Application In Synthesis of 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Attachment of the ligand to the metal may be through a single atom, in which case it is called a monodentate ligand, or through two or more atoms, in which case it is called a didentate or polydentate ligand. Replacing precious metals with cheaper and more environmentally friendly metals is regarded as a highly desirable goal in the field of catalysis.Application In Synthesis of 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Hexakis Porphyrinato Benzenes. A New Class of Porphyrin Arrays was written by Biemans, H. A. M.;Rowan, A. E.;Verhoeven, A.;Vanoppen, P.;Latterini, L.;Foekema, J.;Schenning, A. P. H. J.;Meijer, E. W.;De Schryver, F. C.;Nolte, R. J. M.. And the article was included in Journal of the American Chemical Society in 1998.Safety of 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol The following contents are mentioned in the article:

A new type of porphyrin array (I) (R = Me, OC₁₆H₃₃) has been synthesized by the coupling of six porphyrin moieties to a central benzene core via an ether linkage. The resulting porphyrin supermol. has a diameter up to 80 ? and a mass of 8500 daltons. In solution, the six porphyrins around the central benzene ring arrange themselves into three sets of offset overlapping dimers, which are rapidly interconverting at room temperature Solution UV-vis and fluorescence studies, however, indicate that there are no electronic interactions between the individual porphyrin mols. Upon spreading a chloroform solution of these porphyrin mols. on a surface, they self-assemble to form ring-shaped architectures on a micrometer scale. Near-field scanning optical microscopy studies reveal that the porphyrin moieties within the rings have an ordered arrangement with respect to their position in the ring after the sample has been annealed at 80 ¡ãC for 2 days. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Safety of 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Ligands, especially phosphines and carbenes, can play a key role in modifying and controlling homogeneous organometallic catalysts. Chiral compounds with high purities and ee values are often used as ligands for catalytically active metal complexes. Safety of 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Effect of central metal ion on molecular dipole in porphyrin self-assembled monolayers was written by Khaderbad, Mrunal A.;Rao, Manohar;Jinesh, K. B.;Pandharipande, Rohit;Madhu, S.;Ravikanth, M.;Rao, V. Ramgopal. And the article was included in Nanoscience and Nanotechnology Letters in 2012.Electric Literature of C47H36N4O The following contents are mentioned in the article:

The phys. and electronic properties of nano-scale semiconductor devices are mainly decided by their surfaces and interfaces. Use of dipolar self-assembled monolayer (SAM) on semiconductor/oxide interfaces has an enormous potential to tailor the behavior of nanoelectronic, optical and biol. devices. Among different mols., porphyrins have been identified to form chem. stable SAMs on different substrates and their dipolar properties can be tuned by incorporating various metal species in them. This allows work-function tuning according to various technol. needs. In this paper, we describe the effect of central metal ion (selected period-4 transition metal ions Zn, Cu, Ni, Fe and Co) incorporated in 5-(4-hydroxyphenyl)-10,15,20-tri(p-tolyl)porphyrin (TTPOH) on the surface potential using Kelvin probe microscopy. D. functional theory (DFT) calculations were performed to estimate the magnitude of dipole moments. Also, absorption spectra of TTPOH mol. and its metal derivatives are compared. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Electric Literature of C47H36N4O).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Ligand design occupies a central place in organic synthesis and catalysis. And they often provide a convenient approach to fine-tuning the performance of known catalysts.Electric Literature of C47H36N4O

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Germanium(IV) phthalocyanine-porphyrin based hetero trimers:: synthesis, spectroscopy and photochemistry was written by Kandhadi, Jaipal;Kanaparthi, Ravi Kumar;Giribabu, Lingamallu. And the article was included in Journal of Porphyrins and Phthalocyanines in 2012.Product Details of 57412-08-5 The following contents are mentioned in the article:

The known oxophilicity of Germanium(IV) ion of Germanium(IV) phthalocyanine and porphyrins were exploited to synthesize functionally active, “axial-bonding” -type hetero oligomers. These hetero trimers were fully characterized by elemental anal., FAB-MS, UV-visible, proton NMR (1D and ¹H-¹H COSY) and fluorescence spectroscopies, as well as differential pulse voltammetric method. Comparison of their spectroscopic and electrochem. data with those of the corresponding individual constituents reveals that there is no apparent ¦Ð-¦Ð interactions in these “vertically” linked hetero oligomers. The fluorescence quantum yields are lower of these hetero oligomers in comparison with those of the monomeric chromophores. Electronic energy transfer and photoinduced electron transfer from axial porphyrins to central metalloid phthalocyanine and photoinduced electron transfer from singlet state of axial porphyrins to central metalloid phthalocyanine was detected in these hetero oligomers. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Product Details of 57412-08-5).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Catalytic transformations have become a mainstay in the toolkit of the synthetic and increasing non-synthetic chemist alike. It is clear that future advancements in metal complexes and their applications crucially depend on ligand design, whereas the ligand electronic, steric and topological properties provide numerous improvements to the reactivity and selectivity at the metal centers.Product Details of 57412-08-5

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Polymer-Supported Ruthenium Porphyrins: Versatile and Robust Epoxidation Catalysts with Unusual Selectivity was written by Yu, Xiao-Qi;Huang, Jie-Sheng;Yu, Wing-Yiu;Che, Chi-Ming. And the article was included in Journal of the American Chemical Society in 2000.Recommanded Product: 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol The following contents are mentioned in the article:

Carbonyl ruthenium(II) 5,10,15-tris(4-R-phenyl)-20-(4-hydroxyphenyl)porphyrins (R = Cl, Me) covalently attached to Merrifield’s peptide resin were prepared The catalyst with R = Cl was found to efficiently catalyze Cl₂pyNO epoxidation of a wide variety of alkenes, including aromatic and aliphatic terminal alkenes, cis- and trans-stilbene, cyclohexene and cyclooctene, ¦Á,¦Â-unsaturated ketones, conjugated enyne, glycal, and protected ¦Á-amino alkene. Unusual selectivities were observed for the epoxidations of 1,5-cyclooctadiene, cis-1-phenyl-3-penten-1-yne (9), 3,4,6-tri-O-acetyl-D-glucal (11), and 2-(Boc-amino)-1-phenylbut-3-ene (13), which feature a complete bisepoxide selectivity (1,5-cyclooctadiene), unprecedentedly high cis:trans ratio (9), and complete diastereoselectivity (11 and 13). The new heterogenized metalloporphyrin epoxidation catalysts are of high stability and reusability. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Recommanded Product: 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Ligand design occupies a central place in organic synthesis and catalysis. Chiral compounds with high purities and ee values are often used as ligands for catalytically active metal complexes. Recommanded Product: 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Microwave-assisted expeditious O-alkylation of meso-hydroxyphenylporphyrins was written by Chaleix, Vincent;Couleaud, Pierre;Sol, Vincent;Zerrouki, Rachida;Alves, Sandra;Krausz, Pierre. And the article was included in Journal of Porphyrins and Phthalocyanines in 2009.Recommanded Product: 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol The following contents are mentioned in the article:

A mild method for O-alkylation of meso-hydroxyphenylporphyrin was developed using microwave irradiation This method is clean and efficient for many substrates and resulted in significant improvement in reaction yield and a dramatic decrease in reaction time in comparison to thermal heating. E.g., hydroxyphenylporphyrin I [R = C₆H₄-4-Me, R¹ = H] was reacted with BrCH₂CO₂Et in DMF using K₂CO₃ under microwave irradiation for 5 min gave the O-alkylation product I [R = C₆H₄-4-Me, R¹ = CH₂CO₂Et] with 95% yield. Similar reactions gave O-alkylation products, such as I [R = C₆H₄-4-Me, R¹ = (CH₂)₃OCOMe, (CH₂)₃CO₂Et, CH₂CH:CH₂, CH₂Cú·CH, CH₂CO₂CMe₃, CH(CH₂Me)CO₂Me], with high yields. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Recommanded Product: 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Ligand design occupies a central place in organic synthesis and catalysis. Chiral compounds with high purities and ee values are often used as ligands for catalytically active metal complexes. Recommanded Product: 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

A clamp-like biohybrid catalyst for DNA oxidation was written by van Dongen, Stijn F. M.;Clerx, Joost;Norgaard, Kasper;Bloemberg, Tom G.;Cornelissen, Jeroen J. L. M.;Trakselis, Michael A.;Nelson, Scott W.;Benkovic, Stephen J.;Rowan, Alan E.;Nolte, Roeland J. M.. And the article was included in Nature Chemistry in 2013.Recommanded Product: 57412-08-5 The following contents are mentioned in the article:

In processive catalysis, a catalyst binds to a substrate and remains bound as it performs several consecutive reactions, as exemplified by DNA polymerases. Processivity is essential in nature and is often mediated by a clamp-like structure that phys. tethers the catalyst to its (polymeric) template. In the case of the bacteriophage T4 replisome, a dedicated clamp protein acts as a processivity mediator by encircling DNA and subsequently recruiting its polymerase. Here we use this DNA-binding protein to construct a biohybrid catalyst. Conjugation of the clamp protein to a chem. catalyst with sequence-specific oxidation behavior formed a catalytic clamp that can be loaded onto a DNA plasmid. The catalytic activity of the biohybrid catalyst was visualized using a procedure based on an at. force microscopy method that detects and spatially locates oxidized sites in DNA. Varying the exptl. conditions enabled switching between processive and distributive catalysis and influencing the sliding direction of this rotaxane-like catalyst. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Recommanded Product: 57412-08-5).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Catalytic transformations have become a mainstay in the toolkit of the synthetic and increasing non-synthetic chemist alike. It is clear that future advancements in metal complexes and their applications crucially depend on ligand design, whereas the ligand electronic, steric and topological properties provide numerous improvements to the reactivity and selectivity at the metal centers.Recommanded Product: 57412-08-5

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

A porphyrin-anthracene supramolecular system assembled via complementary nucleic acid base pairing was written by Sirish, Mallena;Maiya, Bhaskar G.. And the article was included in Journal of Porphyrins and Phthalocyanines in 1998.Electric Literature of C47H36N4O The following contents are mentioned in the article:

Covalently linked porphyrin-adenine [meso-5(4-(9-(2-oxyethyl)adenine)phenyl)-10,15,20-tritolylporphyrin] (1) and anthracene-thymine [1-(9-methylanthracene)thymine] (2) conjugates have been synthesized and fully characterized by elemental anal., FAB mass, UV-vis, ¹H NMR, fluorescence and cyclic voltammetric methods. Detailed ¹H NMR studies reveal that 1 and 2 self-assemble in CDCl₃ solutions at 293 ¡À 3 K to form a two-point hydrogen-bonded, bichromophoric, supramol. system 3 with a binding constant of 47 ¡À 5 M^-1 and that both Hoogsteen- and Watson-Crick-type A-T assemblies exist in solution under these exptl. conditions. Spectral and electrochem. data point out the possibility of occurrence of both energy and electron transfer reactions from the singlet excited state of 2 to 1 in the ensemble 3. The singlet state activity of the ensemble 3 has been probed mainly by the time-resolved fluorescence method and the results have been discussed in the light of those obtained earlier on similar “non-covalently” or covalently bound bichromophoric systems. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Electric Literature of C47H36N4O).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. The atoms and molecules used as ligands are almost always those that are capable of functioning as the electron-pair donor in the electron-pair bond (a coordinate covalent bond) formed with the metal atom. The actual catalysts are metal complexes that are prepared from ligands and appropriate metal precursors.Electric Literature of C47H36N4O

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

CIDNP study on porphyrin-photosensitized reactions with phenol and quinone. Dimerization of 4-methoxyphenol and cross coupling of benzoquinone to porphyrins covalently linked with phenol group was written by Maruyama, Kazuhiro;Furuta, Hiroyuki;Osuka, Atsuhiro. And the article was included in Tetrahedron in 1986.Category: catalyst-ligand The following contents are mentioned in the article:

Photoreactions of tetraphenylporphyrin (I) with phenols and/or quinones in C₆H₆ were studied mainly by the CIDNP technique. In the photoreactions of I with 4-MeOC₆H₄OH (II), CIDNP effects due to the radical anion of I and the radical cation of II were observed, while the generation of considerable amounts of 4-MeOC₆H₄O? was indicated by ESR and CIDPN in the system containing I, II, and p-benzoquinone (III). Based on these results, 2 new photoreactions leading to permanent products were developed, i.e., photosensitized dimerization of II and photo-induced cross coupling of III to porphyrins covalently linked with a phenol group. The unique role of phenol in the photo-induced electron transfer reaction of I and III in a non-polar solvent was discussed in terms of its dual function as both the proton and electron donor. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Category: catalyst-ligand).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Ligand, in chemistry, any atom or molecule attached to a central atom, usually a metallic element, in a coordination or complex compound. Chiral compounds with high purities and ee values are often used as ligands for catalytically active metal complexes. Category: catalyst-ligand

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI