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Showing 1 to 20 of 261 for “"porphyrin"”.
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Supramolecular Porphyrin Assemblies: Photosynthetic Reaction Center Analogs and Porphyrin Networks
… is not transferring to the monomeric spacer porphyrin in high yield. Presumably, the DeltaG for this process is too unfavorable. Instead, the excited zirconium bis(porphyrin) sandwich complex simply returns to the ground state. One way to improve upon this system would be to make the bridging …
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Porphyrin liquid crystals
Made available in DSpace on 2011-05-07T12:58:15Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712399.pdf: 6112917 bytes, checksum: 8710d51cba58a5e941a2d63d6e735ca7 (MD5) Previous issue date: 1996
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Actinide porphyrin complexes
The first bis(porphyrin)actinide complexes have been prepared by reaction of M(NEt$\sb2$)$\sb4$ (where M = Th, U) with H$\sb2$TPP or H$\sb2$OEP. The coordination geometry of (TPP)$\sb2$Th is a distorted square-prism where the thorium center is displaced 1.47 A from each of the porphyrin N$\sb4$ …
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Self-assembled porphyrin architectures
Contains fulltext : 146855.pdf (Publisher’s version ) (Open Access)
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Transition metal bis(porphyrin) complexes
Metal bis(porphyrin) complexes M(porph)$\sb2$ have received much attention in the last ten years due to their electronic and structural similarities to the Special Pair in photosynthetic bacteria. The work presented here covers the first transition metal bis(porphyrin) complexes. In addition, the …
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Calixarene Linked Bis-Porphyrin Hosts for Fullerenes and the Assembly of Supramolecular Ferrocene-Porphyrin-Fullerene Triads
Porphyrins and fullerenes are excellent substituents for the construction of photoactive assemblies due to their unique redox and photoelectronic properties. Upon irradiation these assemblies can undergo photoinduced electron transfer between the porphyrin donor and the fullerene acceptor, however …
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FREE-BASE PORPHYRIN FOR CO2 ACTIVATION
… up to now. This work is devoted to the study of porphyrins as organic catalysts of the carbon dioxide cycloaddition both under homogeneous and heterogeneous conditions with the final the goal to improve the sustainability of the production of cyclic carbonates and oxazolidinones. Chapter II: …
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Porphyrin metabolism in congenital erythropoietic porphyria
Meso-hydroxyuroporphyrin I, B-hydroxypropionic acid uroporphyrin I, hydroxyacetic acid uroporphyrin I and peroxyacetic acid uroporphyrin I have been isolated from the urine and plasma of patients with congenital erythropoietic porphyria (CEP) by high-performance liquid chromatography and …
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PORPHYRIN DERIVATIVES AS VERSATILE PROTEASOME MODULATORS
… for this use. It is known that cationic porphyrins behave as proteasome inhibitors and their potency depends on the number of positive charges. During this PhD study, we have worked towards a deeper understanding of the molecular mechanisms responsible for the interactions between …
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Photochemical Oxidation Studies of Porphyrin Ruthenium Complexes
… namely, the cytochrome P450 enzymes. Ruthenium porphyrin complexes have been the center of this research and have successfully been utilized, as catalysts, in major oxidation reactions, such as the hydroxylation of alkanes. The present work focuses on photocatalytic studies of aerobic oxidation …
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Synthesis and use of new Porphyrin Derivatives
… and test capabilities of new spermine-porphyrin and BODIPY derivatives, and to study their interactions with various biological targets. The research period was focused on the synthesis of porphyrin derivatives with a different number of spermine pendants, in order to combine the …
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Supramolecular porphyrin arrays on DNA and SWNT scaffolds
A variety of supramolecular porphyrin arrays on DNA or single walled carbon nanotube scaffolds are presented herein. A novel porphyrin modified nucleoside with multiple degrees of freedom about the linking moiety has been synthesised. Oligonucleotide strands containing the novel ‘flexible’ …
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Porphyrin-DNA as scaffold for nanoarchitecture and nanotechnology
Porphyrins, a substance class that can be found in diverse materials including green leaves and red blood cells, have been studied extensively over many years due to their potential industrial applications, e.g. in making optical electronic devices, in artificial photosynthesis or in sensors. In …
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Apoptosis and porphyrin biosynthesis by a photodynamic chemotherapeutic
… causes transformed cells to accumulate protoporphyrin IX (Proto). Subsequent exposure to light in vitro causes intracellular Proto to initiate formation of singlet oxygen molecules, leading to self-destruction. This photo-activated destruction by ALA is enhanced by addition of the …
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Porphyrin chemistry pertaining to the design of anticancer agents
… cells, especially toward hypoxic tumor cells. Porphyrin drugs used in photodynatnic therapy (PDT) have good selectivity (in term of drug accumulation) toward tumors, but the therapy has a limitation due to poor penetration of light through tissues. The initial objective of this thesis work was …
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