Relevant bibliographies by topics / Porphyrin compounds

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Academic literature on the topic 'Porphyrin compounds'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Porphyrin compounds"

1

Egemen, Gamze, Mustafa Hayvalı, Zeynel Kılıç, A. Osman Solak, and Zafer Üstündağ. "Phosphorus-nitrogen compounds Part 17: The synthesis, spectral and electrochemical investigations of porphyrino-phosphazenes." Journal of Porphyrins and Phthalocyanines 14, no. 03 (March 2010): 227–34. http://dx.doi.org/10.1142/s1088424610001945.

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The reactions of unsymmetrical porphyrins (1 and 2) with Ni(OAc)2·4H2O in boiling DMF produce porphyrin complexes (3 and 4). From the reactions of free porphyrin ligands 1 and 2 with hexachlorocyclotriphosphazatriene, N3P3Cl6 , the new free porphyrino-phosphazene derivatives (5 and 6) are obtained. On the other hand, the reactions of N3P3Cl6 with porphyrin complexes (3 and 4) afford the new porphyrino-phosphazene complexes (7 and 8). In the literature there are a few examples of the porphyrino-phosphazene architectures. The structural investigations of all the compounds have been made by elemental analyses, MS, FTIR, 1H NMR, 31P NMR and UV-visible techniques. The cyclic voltammograms (CVs) are examined in acetonitrile (MeCN) containing 0.1 M tetrabutylammonium-tetrafluoroborate (TBATFB) to investigate the surface attachment properties at the glassy carbon electrode (GCE) and the influence of the presence of metal cations in the porphyrin ring.
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Uemori, Yoshio, Masato Sakurai, Atsuko Osada, Hiroki Munakata, Hiroyasu Imai, and Shigeo Nakagawa. "Synthesis and properties of water-soluble porphyrins bearing multidentate ligands." Journal of Porphyrins and Phthalocyanines 08, no. 08 (August 2004): 1047–54. http://dx.doi.org/10.1142/s1088424604000416.

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Water-soluble porphyrins bearing multidentate ligands were prepared by covalent binding of nitrilotriacetic acid to 5,10,15,20-tetrakis(4-aminophenyl)porphyrin or three atropisomers of 5,10,15,20-tetrakis(2-aminophenyl)porphyrin. The acid-base properties and monomer-dimer behavior of the porphyrins were affected by the positions of the multidentate ligands with respect to the porphyrin plane. Among the porphyrins, the porphyrin bearing multidentate ligands at the para position of the phenyl groups dimerized in an aqueous solution. The association constants of the porphyrins with various aromatic compounds were studied in water at pH 7.4 containing 10 mM HEPES at 25°C. These values varied with the structure and charges of both the porphyrins and the aromatic compounds. The association constants of the porphyrin bearing multidentate ligands at the 2-position of the phenyl groups were small compared to those of the porphyrin bearing multidentate ligands at the 4-position.
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Senge, Mathias O., and Mia Davis. "Porphyrin (porphine) — A neglected parent compound with potential." Journal of Porphyrins and Phthalocyanines 14, no. 07 (July 2010): 557–67. http://dx.doi.org/10.1142/s1088424610002495.

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Porphine is the parent compound of a family of biologically and chemically relevant compounds called porphyrins. The potential of these compounds is enormous and it would be advantageous to use the porphine (porphyrin) unit as a building block for the synthesis of diverse porphyrin complexes with a wide range of applications. However, despite first being synthesized over 70 years ago, porphine has not been utilized to its full extent due to low yield syntheses and poor solubility. Recent advances have now overcome many of these problems. The purpose of this review is to illustrate the advances made in porphine chemistry to illustrate the inherent potential of this simple compound.
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Neagu, Monica, Gina Manda, Carolina Constantin, Eugen Radu, and Rodica-Mariana Ion. "Synthetic porphyrins in experimental photodynamic therapy induce a different antitumoral effect." Journal of Porphyrins and Phthalocyanines 11, no. 01 (January 2007): 58–65. http://dx.doi.org/10.1142/s1088424607000084.

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The aim of the study was to investigate the influence of discrete structural differences in synthetic porphyrins on the antineoplastic effect induced in myelocitic cell line K562 after experimental photodynamic therapy procedure. For this study, we used 5,10,15,20-tetra(1-naphthyl)porphyrin, 5,10,15,20-tetra(4-sulfonatophenyl)porphyrin and their Zn complexes. For all these compounds, the following photodynamic therapy parameters were optimized: cell concentration, dye loading concentration, loading time and irradiation procedure. The non-toxic doses of porphyrins were different according to their structure: for 5,10,15,20-tetra(1-naphthyl)porphyrin compounds, the dose was of 10 μg.mL-1, and for 5,10,15,20-tetra(4-sulfonatophenyl)porphyrin compounds, the dose was 20 μg.mL-1. Cell functionality was assessed as membrane integrity, viability, and number of metabolically active cells. Photodynamic cell degradation kinetics showed that during irradiation tumor cells are actively destroyed, in contrast to unloaded cells. K562 cells loaded with the above-mentioned compounds and subjected to irradiation, displayed lower proliferative capacity compared to the control, for a period of 72 h after irradiation. The proliferative capacity of K562 cell line was more strongly inhibited by the 5,10,15,20-tetra(1-naphthyl)porphyrin family of compounds than by the 5,10,15,20-tetra(4-sulfonatophenyl)porphyrin family. The tested synthetic porphyrins showed effective antineoplastic activity against K562 leukemia cells in our in vitro photodynamic therapy experimental model.
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Ou, Zhongping, Xueyan Chen, Lina Ye, Songlin Xue, Yuanyuan Fang, Xiaoqin Jiang, and Karl M. Kadish. "N-confusedmeso-tetraaryl-substituted free-base porphyrins: determination of protonation and deprotonation constants in nonaqueous media." Journal of Porphyrins and Phthalocyanines 19, no. 01-03 (January 2015): 251–60. http://dx.doi.org/10.1142/s1088424614501132.

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The protonation and deprotonation reactions for a series N-confused meso-tetraaryl-substituted free-base porphyrins containing electron-donating or electron-withdrawing substituents was monitored in CHCl3and DMF by UV-visible spectroscopy during titrations with trifluoroacetic acid or tetra-n-butylammonium hydroxide. The spectroscopic data was also used to calculate equilibrium constants for these reactions. The examined compounds are represented as (XPh)4NCPH2, where "NCP" represents the N-confused porphyrin π-conjugated macrocycle and X is a CH3O , CH3, H or Cl para-substituent on the four meso-phenyl rings (Ph) of the compound. The porphyrins can exist in two tautomeric forms depending upon the solvent and each tautomer undergoes two stepwise protonation reactions leading to formation of the mono- and bis-protonated porphyrins, [(XPh)4NCPH3]+and [(XPh)4NCPH4]2+. A single step deprotonation is observed for the same compounds in DMF and the product is assigned as [(XPh)4NCPH]-. Comparisons are made between UV-visible spectra of the protonated, neutral and deprotonated forms of the porphyrin and the effect of the porphyrin ring substituents and tautomeric form of the neutral porphyrin on the UV-visible spectra and protonation constants is discussed along with data from DFT calculations.
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Espitia-Almeida, Fabián, Carlos Diaz-Uribe, William Vallejo, Doris Gómez-Camargo, Arnold R. Romero Bohórquez, and Cristian Linares-Flores. "Photophysical study and in vitro approach against Leishmania panamensis of dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV)." F1000Research 10 (July 1, 2021): 379. http://dx.doi.org/10.12688/f1000research.52433.2.

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Background: Photodynamic therapy activity against different biological systems has been reported for porphyrins. Porphyrin modifications through peripheral groups and/or by metal insertion inside the ring are main alternatives for the improvement of its photo-physical properties. In this study, we synthesized and characterized 5,10,15,20-tetrakis(4-bromophenyl)porphyrin and the dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV). Methods: Metal-free porphyrin was synthesized using the Alder method, while the Sn(IV)-porphyrin complex was prepared by combining metal-free porphyrin with stannous chloride in DMF; the reaction yields were 47% and 64% respectively. Metal-free porphyrin was characterized by UV-Vis, FT-IR, ESI-mass spectrometry and 13C-NMR. Additionally, the Sn(IV) -porphyrin complex was characterized using UV-Vis and FT-IR. Cyclic voltammetry tests in four different solvents. The fluorescence quantum yield (Φf) was measured using fluorescein as a standard, the singlet oxygen quantum yield (ΦD) was estimated using the standard 5,10,15,20-(tetraphenyl)porphyrin (H2TPP) and the quencher of singlet oxygen 1,3-diphenylisobenzofuran (DPBF). Results: UV-Vis assay showed typical Q and Soret bands for porphyrin and its metallo-porphyrin complex. Compounds showed photoluminescence at the visible range of electromagnetic spectrum. The inclusion of the metal in the porphyrin core changed the Φf from 0.15 to 0.05 and the ΦD increased from 0.55 to 0.59. Finally, the effect of the compounds on the viability of L. panamensis was evaluated by means of the MTT test. The results showed that both compounds decreased the viability of the parasite; this inhibitory activity was greater under light irradiation; the porphyrin compound had IC50 of 16.5 μM and the Sn(IV)-porphyrin complex had IC50 of 19.2 μM. Conclusion: The compounds were synthesized efficiently, their characterization was carried out by different spectroscopy techniques and their own signals were evidenced for both structures, both compounds decreased the cell viability of L. panamensis.
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Oliveira, Anabela Sousa, Dumitru Licsandru, Rica Boscencu, Radu Socoteanu, Veronica Nacea, and Luis Filipe Vieira Ferreira. "A Singlet Oxygen Photogeneration and Luminescence Study of Unsymmetrically Substituted Mesoporphyrinic Compounds." International Journal of Photoenergy 2009 (2009): 1–10. http://dx.doi.org/10.1155/2009/413915.

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This paper deals with a series of new unsymmetrically substituted mesoporphyrins: 5-(2-hydroxyphenyl)-10,15,20-tris-phenyl-21,23-H-porphyrin (TPPOHO), 5-(3-hydroxyphenyl)-10,15,20-tris-phenyl-21,23-H-porphyrin (TPPOHM), 5-(4-hydroxyphenyl)-10,15,20-tris-phenyl-21,23-H-porphyrin (TPPOHP), 5-(2-hydroxyphenyl)-10,15,20-tris-butyl-21,23-H-porphyrin (TBPOHO), and their parent nonsubstituted compounds, respectively, 5,10,15,20-tetrakis-phenyl-21,23-H-porphyrin (TPP) and 5,10,15,20-tetrakis-butyl-21,23-H-porphyrin (TBP). Several photophysical studies were carried out to access the influence of the unsymmetrical substitution at the porphyrinic macrocycle on porthyrin's photophysical properties, especially porthyrin's efficiency as singlet oxygen sensitizers. The quantum yields of singlet oxygen generation were determined in benzene (ΦΔ(TPP) = 0.66 ± 0.05;ΦΔ(TPPOHO) = 0.69 ± 0.04;ΦΔ(TPPOHM) = 0.62 ± 0.04;ΦΔ(TPPOHP) = 0.73 ± 0.03;ΦΔ(TBP) = 0.76 ± 0.03;ΦΔ(TBPOHO) = 0.73 ± 0.02) using the 5,10,15,20-tetraphenyl-21,23-H-porphine (ΦΔ(TPP) = 0.66) and Phenazine (ΦΔ(Phz) = 0.83) as reference compounds. Their fluorescence quantum yields were found to be (Φf(TPPOHO) = 0.10 ± 0.04;Φf(TPPOHM) = 0.09 ± 0.03;Φf(TPPOHP) = 0.13 ± 0.02;Φf(TBP) = 0.08 ± 0.03 andΦf(TBPOHO) = 0.08 ± 0.02 using 5,10,15,20-tetraphenyl-21,23-H-porphine as referenceΦf(TPP) = 0.13). Singlet state lifetimes were also determined in the same solvent. All the porphyrins presented very similar fluorescence lifetimes (mean values ofτS(withO2, air equilibrated) = 9.6 ± 0.3 nanoseconds and (withoutO2, argon purged) = 10.1 ± 0.6 nanoseconds, resp.). The phosphorescence emission was found to be negligible for this series of unsymmetrically substituted mesoporphyrins, but an E-type, thermally activated, delayed fluorescence process was proved to occur at room temperature.
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Quan, Gia Co, Morgane Denis, Brian Abeykoon, Jean-Bernard Tommasino, Erwann Jeanneau, Catherine Journet, Thomas Devic, and Alexandra Fateeva. "Supramolecular assemblies of phenolic metalloporphyrins: Structures and electrochemical studies." Journal of Porphyrins and Phthalocyanines 23, no. 01n02 (January 2019): 103–16. http://dx.doi.org/10.1142/s108842461950007x.

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The reactivity of two phenolic porphyrins bearing respectively catechol and gallol-derived meso substituents (5,10,15,20-tetrakis(3,4-dihydroxyphenyl)porphyrin and 5,10,15,20-tetrakis(3,4,5-trihydroxyphenyl)porphyrin) with trivalent metallic ions (Fe, Mn, In) was studied. Six supramolecular compounds were obtained and structurally characterized by single crystal X-ray diffraction. In each compound, the supramolecular assembly was based on the axial coordination of a phenolate function to the metallic ion lying in the porphyrinic core. A great diversity of supramolecular architectures was accessible through such simple arrangements, and objects ranging from dimers to one-dimensional polymers were isolated. Some of these assemblies were further investigated in solution by mass spectrometry and by UV-vis absorption spectroscopy. For the iron-based materials, the redox behavior was studied in solution through cyclic voltammetry experiments in inert conditions and under air.
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BREGADZE, VLADIMIR I., IGOR B. SIVAEV, DETLEF GABEL, and DIETER WÖHRLE. "Polyhedral boron derivatives of porphyrins and phthalocyanines." Journal of Porphyrins and Phthalocyanines 05, no. 11 (November 2001): 767–81. http://dx.doi.org/10.1002/jpp.544.

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The synthesis of compounds containing polyhedral boron cages and porphyrin or phthalocyanine units connected covalently in one molecule is reviewed. The importance of these compounds arises, on the one hand, from the use of polyhedral boron derivatives in neutron capture therapy for cancer; on the other hand, porphyrins and phthalocyanines are known as photosensitizers in photodynamic tumor therapy. Current interest in the binding of polyhedral boron compounds to porphyrins and phthalocyanines is due to the observation that porphyrins and phthalocyanines show improved uptake and good persistence in tissues. Medical applications of compounds containing polyhedral boron cages and porphyrin or phthalocyanine units in one molecule are briefly discussed.
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Kingsbury, Christopher J., Keith J. Flanagan, Hans-Georg Eckhardt, Marc Kielmann, and Mathias O. Senge. "Weak Interactions and Conformational Changes in Core-Protonated A2- and Ax-Type Porphyrin Dications." Molecules 25, no. 14 (July 13, 2020): 3195. http://dx.doi.org/10.3390/molecules25143195.

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Individual chemical motifs are known to introduce structural distortions to the porphyrin macrocycle, be it in the core or at the periphery of the macrocycle. The interplay when introducing two or more of these known structural motifs has been scarcely explored and is not necessarily simply additive; these structural distortions have a chance to compound or negate to introduce new structural types. To this end, a series of compounds with complementary peripheral (5,15-disubstitution) and core (acidification) substitution patterns were investigated. The single-crystal X-ray structures of 18 5,15-diphenylporphyrin, 5,15-diphenylporphyrindi-ium diacid, and related compounds are reported, including the first example of a 5,15-dialkylporphyrindi-ium. Normal-coordinate structural decomposition (NSD) analysis is used for a detailed analysis of the conformation of the porphyrin subunit within the crystal structures. An elongation of porphyrin macrocycles along the C5,C15- axis (B2g symmetry) is observed in all of the free base porphyrins and porphyrin dications; distance across the core is around 0.3 Å in the free base and diacid compounds, and more than doubled in 5,15-dipentylporphyrin and 5,15-dipentylporphyrindi-ium diacid. While the free base porphyrins are largely planar, a large out-of-plane distortion can be observed in 5,15-diphenylporphyrin diacids, with the expected “projective saddle” shape characteristic for such systems. The combination of these two distortions (B2u and B2g) from regular porphyrin structure results in a macrocycle best characterized in the chiral point-group D2. A rare structural type of a cis-hydrogen bond chelate is observed for 5,15-dipentylporphyrindi-ium diacid, which adopts an achiral C2v symmetry. Crystallographic data indicate that the protonated porphyrin core forms hydrogen bonding chelates (N-H⋯X⋯H-N) to counter-anions. Weaker interactions, such as induced intramolecular C-H⋯O interactions from the porphyrin periphery are described, with distances characteristic of charge-assisted interactions. This paper offers a conceptual framework for accessing porphyrin macrocycles with designable distortion and symmetry, useful for the selective perturbation of electronic states and a design-for-application approach to solid state porphyrin materials.
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Dissertations / Theses on the topic "Porphyrin compounds"

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Cho, Jeongguk. "Porphyrin-catalyzed reduction of nitroaromatic compounds /." Access abstract and link to full text, 1992. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9307476.

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劉純晶 and Chunjing Liu. "Nonplanar and sterically encumbered ruthenium porphyrins and catalyticreactivity of ruthenium and manganese porphyrin complexes supported onMCM-41." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31237423.

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Rajapakse, Nimal. "Oxidations using dioxoruthenium (VI)-porphyrin complexes ; and studies on some organoruthenium-porphyrin species." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30767.

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The oxidation of three alkyl thioethers, phenol and 2-propanol by trans-dioxo ruthenium porphyrin species, and the synthesis, characterization and reactivity of several new ruthenium porphyrin complexes are described in this thesis. The trans-dioxo species Ru(Porp)(O)₂ [Porp= the dianions of 5,10,15,20-tetramesitylporphyrin (TMP) and 5,10,15,20-(2,6-dichlorophenyl)porphyrin (OCP)] selectively oxidize diethyl-, di-n-butyl- and decylmethyl- sulfides to the corresponding sulfoxides at room temperature. The reaction is first order in [Ru] and in [thioether]. The second order rate constants for the first O-atom transfer from the Ru(TMP) system are: 7.54xl0⁻³, 1.23xl0⁻² and 1.14x10-¹ M⁻¹ s⁻¹ respectively for the three thioethers at 20.0 °C. The activation parameters for the O-atom transfer process are also determined: for Et₂S, ∆H‡= 58.3 kJ mol⁻¹ and ∆S‡= -86 J K⁻¹ mol⁻¹; for nBu₂S, AH‡= 47.4 kJ mol⁻¹and ∆S‡= -120 J K⁻¹ mol⁻¹; for DecMeS, ∆H‡= 56.5 kJ mo⁻¹ and ∆S‡= -70 J K⁻¹ mol⁻¹. A second order rate constant of 7.23xl0⁻²M⁻¹s⁻¹ is measured at 20.0 °C for the oxidation of Et₂S by Ru(OCP)(O)₂. The intermediates Ru(TMP)(OSEt₂)₂, Ru(TMP)(OSEt₂)(OSEt₂) and the final product Ru(TMP)(0SEt₂)₂,where O and S refer to O- and S- bonded sulfoxide, are observed by ¹H nmr, and the last mentioned is isolated and characterized. A mechanism is proposed, based on electrophilic attack of the O=Ru=O moiety on :SR₂ to form bis-O-bonded species which subsequently isomerizes to bis-S-bonded species via mixed species. The Ru(TMP)(O)₂/Et₂S/O₂ system at room temperature is catalytic in complex, but produces only about 5 turnovers due to poisoning of the catalyst by the reaction product. The same system at >65 °C gives higher turnovers, but now porphyrin ligand degradation is observed, perhaps via oxidation by the O=Ru=O moiety. The Ru(OCP)(0)₂/Et₂S/O₂ system at 100 °C catalytically oxidizes Et₂S to Et₂SO and Et₂SO₂ (in ~ 4:1 ratio) and the porphyrin ligand does not undergo oxidative destruction. The Ru(TMP)(O)₂ species reacts with phenol via an observed intermediate Ru(TMP)(p-O(H)C₆H₄OH)₂ to form Ru(IV)(TMP)(OC₆H₄OH)₂, a paramagnetic (S=l) complex which is isolated and characterized. The oxidation reaction is first order in both [Ru] and [phenol] with a second order rate constant 6.90x10⁻² M⁻¹ s⁻¹at 20.0 °C. A mechanism based on electrophilic attack by the O=Ru=O moiety on the aryl ring followed by proton migration is proposed. This mechanism also explains the formation of some free para-benzoquinone and 1 equivalent of water per Ru. No ortho-benzoquinone is formed in the reaction. Preliminary ⁻H nmr studies reveal that 2-propanol is oxidized to acetone by Ru(TMP)(O)₂. A paramagnetic species (S= 1) was isolated as the only porphyrin product but not characterized. A range of novel ruthenium porphyrin complexes is also prepared. The reaction of acetylene with the four-coordinate Ru(TMP) species forms [Ru(TMP)]₂(u-C₂H₂), the first reported organometallic ruthenium porphyrin dimer. The complexes, Ru(TMP)(PhCCPh) and Ru(TMP)(PhCCH), the first π-bonded alkyne species in ruthenium porphyrin chemistry, are characterized in solution. The π-bonded alkene complexes Ru(TMP)(CH₂CH₂) OPrOH).(iPrOH) and Ru(TMP)(CH₂CH₂) are isolated and characterized, while the Ru(TMP)(cyclohexene) complex is characterized in situ. The Ru(TMP)(OSEt₂)₂ complex is isolated also by the reaction of Ru(TMP)(CH₃CN)₂with Et₂SO. The Ru(TMP)(L)₂ complexes, L= OSMe₂, OSnPr₂ and OSnBu₂ are also prepared via the above method and characterized. Some new Ru(OCP) complexes, (the monocarbonyl, the bis-acetonitrile and the dioxo- species) are also isolated and characterized.
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Liu, Chunjing. "Nonplanar and sterically encumbered ruthenium porphyrins and catalytic reactivity of ruthenium and manganese porphyrin complexes supported on MCM-41 /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19737518.

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梁嘉茵 and Ka-yan Sarana Leung. "Complexes of iminato, nitrido, imido, and hydrazido ruthenium of osmium porphyrins." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31243307.

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Sek, Sau Yin. "The synthesis of haematoporphyrin derivative III and other novel porphyrins /." Title page, table of contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phs4622.pdf.

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Zhang, Rui, and 張瑞. "Asymmetric organic oxidation by chiral ruthenium complexes containing D2 and D4 symmetric porphyrinato ligands." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B42576246.

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8

Sishta, Chand. "The coordination chemistry of ruthenium porphyrin complexes." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30790.

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This thesis work reports developments in the coordination chemistry of ruthenium porphyrin complexes, both in terms of the synthesis and chemistry of new compounds, as well as the study of the solution chemistry of some previously reported complexes. The synthesis, characterization and chemistry of ten new Ru(porp) coordination complexes in the oxidation states Ru[superscript]Ⅲ and Ru[superscript]Ⅳ containing halide (Br, CI) and other axial ligands (pyridine, CH₃CN, NH₃ and SbF₆) are described in this thesis. Some additional ten Ru(porp) complexes have been studied in situ. Measurement of the rate constants for forward and reverse reactions and the corresponding equilibrium constant by 'H NMR and UV/visible spectroscopy for the dissociation of PPh₃ ligand from Ru(OEP)L(PPh₃) (OEP is the octaethylporphyrinato dianion; L = CO, PPh₃) in C₇D₈ to generate the previously reported five-coordinate Ru(OEP)L complexes allowed for an estimation of the Ru-P bond strength (64 ± 9 kJ mol⁻¹) in these complexes. A study of PPh₃ dissociation from Ru(OEP)CO(PPh₃) in C₇D₈ and in CDC1₃ indicates that solvation effects play a major role, with CDC1₃ being more capable than C₇D₈ of solvating the Ru(OEP)CO complex. The presence of trace H₂0 in these systems was a major problem, and the coordination of H₂0 to Ru(OEP)L complexes to generate the in situ Ru(OEP)L(H₂0) complexes (L = CO, PPh₃) is described. The formation of Ru(OEP)L(H₂0) and the observed difference in the solvation of Ru(OEP)CO by C₇H₈ and CHC1₃ indicate that truly Five-coordinate species may not exist in solution. The outer-sphere oxidation of Ru [superscript]Ⅳ(OEP)PPh₃ by 0₂ to give [Ru [superscript]Ⅳ(OEP)OH]₂0 was shown to occur only in the presence of H₂0. Mechanistic studies on the previously reported reaction of HCI with [Ru(OEP)]₂ to generate Ru^(OEP)Cl₂ (C. Sishta, M.Sc.Thesis, University of British Columbia, 1986) show that solvent plays a major role in directing this oxidation reaction. A reaction stoichiometry of 4:1 between HCI and [Ru(OEP)]₂ in C₆D₆ or C₇D₈ showed that HCI itself was the oxidant and not trace Cl₂ in HCI, as thought previously. A range of HX acids having pK[subscript]a, values in the range 38 to less than -10 (HX = H₂, MeOH, H₂0, H₂S, CH₃COOH, C₆H₅COOH, HF, CF₃COOH, HN0₃, HBF₄, HCI. HBr, and HSbF₆) were tested for reactivity with [Ru(OEP)]₂in C₆D₆; the data showed that a strong acid (pK[subscript]a < ca. 0) was necessary to initiate reactivity. The complex Ru[superscript]Ⅳ(OEP)(SbF₆)₂ was generated in situ by reacting HSbF₆ with [Ru(OEP)]₂. In CH₂C1₂, a 1:1 stoichiometric reaction between HCI and [Ru(OEP)]₂ was observed, instantly fanning a mixture of products, tentatively formulated as Rura(OEP)H and [Ru[superscript]Ⅲ(OEP)]₂CHCl₂ based on spectroscopic data. The species proved impossible to separate. These same products were formed slowly by the reaction of [Ru(OEP)]₂ with CH₂C1₂ in the absence of HCI, and kinetic studies suggest that a direct reaction of [Ru(OEP)]₂ with CH₂C1₂ is likely, rather than reaction of [Ru(OEP)]₂ with impurities in CH₂C1₂. The product mixture generated Ru(OEP)Cl₂ upon further reaction with HCI, both in the absence and in the presence of air. The complex Ru[superscript]Ⅳ(OEP)(BF₄)₂ was generated in situ by an analogous reaction of aqueous HBF₄ with the product mixture. The required hydrogen-containing co-product from the reaction of HX (X = Br, CI) with [Ru(OEP)|₂ in C₇D₈ or CH₂C1₂ was not detected, but was shown not to be H₂. Oxidation of Ru(porp)(CH₃CN)₂ and Ru(OEP)py₂ (py = pyridine; porp = OEP, TMP (the dianion of tetramesitylporphyrin)) by gaseous HX (X = Br, CI) in the absence of air yielded Ru[superscript]Ⅳ(porp)X₂ complexes. The new compound Ru(TMP)Br₂ was synthesized by this method using the bis(acetonitrile) precursor, and was characterized by spectroscopy; the chloride analogue Ru(TMP)Cl₂ was generated in situ. The magnetic properties (susceptibility and moment) of Ru(OEP)Br₂ from 6 to 300 K are unlike those reported for ruthenium(IV) non-porphyrin complexes, and reveal a significant contribution from temperature-independent paramagnetism. The reaction of Ru(OEP)X₂ (X = Br, CI) with NH₃ gave the complexes Ru[superscript]Ⅲ(OEP)X(NH₃), which upon acidification under an inert atmosphere yielded the Rum(OEP)X compounds. These Ru111 complexes were characterized by spectroscopic techniques, and the solution chemistry of the five-coordinate species Ru(OEP)X was developed: the Ru[superscript]Ⅲ(OEP)X(CH₃CN) species were also characterized. Solvation of the five-coordinate species Ru(OEP)X (X = Br, CI) was observed in coordinating solvents to form the six-coordinate species Ru(OEP)X(solvent) (solvent = py, CH₃CN and MeOH). Estimates of the equilibrium constants for the association of these ligands to Ru(OEP)X were obtained from UV/visible titration experiments in CH₂C1₂. Similarly, the equilibrium constant for the association of Br to Ru(OEP)Br to generate in situ (n-Bu)₄N⁺[Ru[superscript]Ⅲ(OEP)Br⁺₂]", was measured. Disappointingly, the complexes Ru(OEP)X were shown not to catalyze the oxidation of organic substrates such as cyclohexene. Electrochemical and spectroelectrochemical studies of the complexes Ru(OEP)X₂ and Ru(OEP)X (X = Br, CI) showed that the Ru[superscript]Ⅳ/Ru[superscript]Ⅲ couple occurred at 480-460 mV and 950-870 mV vs. NHE, respectively, and that the probable reductant for the reaction of Ru(OEP)X₂ with NH₃ was NH₃ itself. A facile reduction of Ru(OEP)(SbF₆)₂ gave the complex Ru[superscript]Ⅲ(OEP)SbF₆, by a probable homolysis of the Ru-F bond. The outer-sphere oxidation of Ru(OEP)py₂ by air in the presence of HX acids gave the isolated or in situ characterized complexes [Ruin(OEP)py₂]+ X" (X = CI, Br, F, BF₄). Similar oxidation of Ru(OEP)(CH₃CN)₂ formed [Ru(OEP)(CH₃CN)₂]+ Br-. Electrochenucal studies showed that 0₂ in acidic media was capable of oxidizing the Ru(OEP)(solvent)₂ complexes (solvent = py, CH₃CN) to the Ru[superscript]Ⅲ complexes, presumably generating H0₂ .
Science, Faculty of
Chemistry, Department of
Graduate
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Pan, Jie. "Organometallic porphyrin based complexes for photophysical and biological application." HKBU Institutional Repository, 2016. https://repository.hkbu.edu.hk/etd_oa/331.

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This thesis focuses on the development of porphyrin-based complexes as multi-modal bio-imaging probes. Detailed studies of photophysical and biological properties were included.;In chapter 1, the general background of porphyrin and its derivatives, their structure specialty, synthetic methods, photophysical properties, and applications in biological system were described.;Curcumin-bridged porphyrin-copper complex (Por-Cu-Cur) which can permeate through the high blood-brain barrier, accumulate fast in brain tissues, and emit brilliant and stable two photon excited emission has been developed. Apart from this, Por-Cu-Cur shows high binding affinity for Ab fibrils, and decent inhibitory effect on the fibrillation of Ab1-42 peptides, as well as low toxicity to neuro-derived SK-N-SH cells in vitro and particularly in vivo in transgenic mice.;The design and synthesis of amphiphilic porphyrin linked ruthenium complexes were described. We focus on the photophysical studies of its UV-Vis absorption spectrum, fluorescence spectrum, solvatochromism, and singlet oxygen phosphorescence. The converse energy transfer mechanism of porphyrin-ruthenium complexes and zinc-porphyrin-ruthenium complexes has been clearly studied. Subcellular localization, dark cytotoxicity and photodynamic therapy has been well studied, which efficiency correspond to the energy transfer mechanism.;Based on the previous study, we would like to provide a proof-of-concept model - labelling (hot/cold) gallium in porphyrin-based complex with a short reaction time (but with high reaction yield) and aim to develop a multi-modal bioprobe for photodynamic therapy, optical imaging and positron emission tomography in one piece. An amphiphilic hot gallium-porphyrin-ruthenium compound has been synthesized (GaporRu-1) with reaction time of 15 minute and 85 % yield. The acidity of GaporRu-1 enables selective subcellular localization in lysosome. It also has an good singlet oxygen quantum yield (61.4 %), which proves its great potential for further in vivo study for as both PDT and PET agents.;Experimental details are shown in chapter 5. Including details of photophysical measurements, instrumentation and biological measurements.
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Umetani, Masataka. "Development of Novel π-Conjugated Compounds Based on Tripyrrin." Kyoto University, 2020. http://hdl.handle.net/2433/253105.

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Books on the topic "Porphyrin compounds"

1

The colours of life: An introduction to the chemistry of porphyrins and related compounds. Oxford: Oxford University Press, 1997.

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Sergeevich, Enikolopi͡a︡n Nikolaĭ, ed. Metalloporfiriny. Moskva: "Nauka", 1988.

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Berezin, Dmitrij Borisovič. Makrocikličeskij ėffekt i strukturnaja chimija porfirinov. Moskva: URSS [u.a.], 2010.

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Brady, Sharon P. Porphyrins and metalloporphyrins as biomimetic oxidation catalysts and as photosensitisers in photodynamic therapy. Dublin: University College Dublin, 1997.

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Singh, Jag J. Investigation of oxygen-induced quenching of phosphorescence in photoexcited aromatic molecules by positron annihilation spectroscopy. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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Singh, Jag J. Investigation of oxygen-induced quenching of phosphorescence in photoexcited aromatic molecules by positron annihilation spectroscopy. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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Singh, Jag J. Investigation of oxygen-induced quenching of phosphorescence in photoexcited aromatic molecules by positron annihilation spectroscopy. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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Singh, Jag J. Investigation of oxygen-induced quenching of phosphorescence in photoexcited aromatic molecules by positron annihilation spectroscopy. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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Singh, Jag J. Investigation of oxygen-induced quenching of phosphorescence in photoexcited aromatic molecules by positron annihilation spectroscopy. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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Photosensitizers in medicine, environment, and security. Dordrecht: Springer, 2012.

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Book chapters on the topic "Porphyrin compounds"

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of brominated iron porphyrin." In Magnetic Properties of Paramagnetic Compounds, 377–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_211.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of cobalt(II) complex with porphyrin." In Magnetic Properties of Paramagnetic Compounds, 1019–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_594.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of dinuclear iron(III)-porphyrin-copper(II) complex anion with a sulfur bridge having gallium-porphyrin cation." In Magnetic Properties of Paramagnetic Compounds, 362–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_204.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of dinuclear iron(III)-porphyrin-copper(II) complex anion with a sulfur bridge having aluminium-porphyrin cation." In Magnetic Properties of Paramagnetic Compounds, 364–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_205.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of copper(II) porphyrin п-cation radical." In Magnetic Properties of Paramagnetic Compounds, 19–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_6.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of cyclic trimeric iron(III) complex with porphyrin." In Magnetic Properties of Paramagnetic Compounds, 533–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_291.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of iron(III) deformed porphyrin π-cation radical." In Magnetic Properties of Paramagnetic Compounds, 340–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53971-2_172.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of iron(III) deformed porphyrin π-cation radical." In Magnetic Properties of Paramagnetic Compounds, 342–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53971-2_173.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of iron(III) deformed porphyrin π-cation radical." In Magnetic Properties of Paramagnetic Compounds, 344–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53971-2_174.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of iron(III) complex with non-planar porphyrin." In Magnetic Properties of Paramagnetic Compounds, 388–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53971-2_196.

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Conference papers on the topic "Porphyrin compounds"

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Soultati, Anastasia, George Papadimitropoulos, Dimitris Davazoglou, Panagiotis Argitis, Dimitris Alexandropoulos, Christina Tanya Politi, Nikolaos Vainos, George Pistolis, Athanasios G. Coutsolelos, and Maria Vasilopoulou. "Near-IR organic light emitting diodes based on porphyrin compounds." In 2015 17th International Conference on Transparent Optical Networks (ICTON). IEEE, 2015. http://dx.doi.org/10.1109/icton.2015.7193672.

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Zalessky, Viacheslav N., Vladimir Bobrov, Igor Michalkin, and Vitaliy Trunov. "Effectiveness of porphyrin-like compounds in photodynamic damage of atherosclerotic plaque." In Optics, Electro-Optics, and Laser Applications in Science and Engineering, edited by Thomas J. Dougherty. SPIE, 1991. http://dx.doi.org/10.1117/12.44055.

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Speck, M., M. Senge, and H. Kurreck. "Synthesis and Characterization of Porphyrin-o-Quinones - A New Group of Model Compounds for Photosynthesis." In The 4th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2000. http://dx.doi.org/10.3390/ecsoc-4-01923.

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Rahimi, Rahmatollah, Fatemeh Fayyaz, and Mehdi Rassa. "Comparison of Minimal Inhibitory Concentration of Porphyrin Compounds Against Bacillus Subtilis Under Irradiation With Visible Light." In The 18th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2014. http://dx.doi.org/10.3390/ecsoc-18-b024.

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Fayyaz, Fatemeh, Rahmatollah Rahimi, Mehdi Rassa, and Reza Hedayat Yaghoobi. "The effect of irradiation time on the viability of Bacillus subtilis by cationic porphyrin compounds." In 1st Electronic Conference on Molecular Science. Basel, Switzerland: MDPI, 2015. http://dx.doi.org/10.3390/ecms-1-d001.

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Arshad, Syariena, Muhammad Mat Salleh, and Muhammad Yahaya. "The selectivity of quartz crystal microbalance gas sensor coated with TiO2-porphyrin nanocomposite thin films towards volatile organic compounds." In 2008 IEEE International Conference on Semiconductor Electronics (ICSE). IEEE, 2008. http://dx.doi.org/10.1109/smelec.2008.4770381.

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Rella, Roberto, Simona Capone, Pietro Siciliano, J. Spadavecchia, and G. Ciccarella. "Spin-coated thin films of different metal phthalocyanines and porphyrin-phthalocyanine blend for optochemical sensors of volatile organic compounds." In Second European Workshop on Optical Fibre Sensors. SPIE, 2004. http://dx.doi.org/10.1117/12.566796.

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Chu, Xiang-yong, Yu Fang, Xing-zhi Wu, Li-hao Luo, Jun-yi Yang, and Ying-lin Song. "Optical nonlinear properties of a new porphyrin compound." In ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, edited by Farzin Amzajerdian, Astrid Aksnes, Weibiao Chen, Chunqing Gao, Yongchao Zheng, and Cheng Wang. SPIE, 2013. http://dx.doi.org/10.1117/12.2034698.

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Fayyaz, Fatemeh, Rahmatollah Rahimi, Mehdi Rassa, and Reza Hedayat Yaghoobi. "Photodynamic antimicrobial chemotherapy, a pathway for photo-inactivation of bacteria by porphyrins compounds." In 1st Electronic Conference on Molecular Science. Basel, Switzerland: MDPI, 2015. http://dx.doi.org/10.3390/ecms-1-b003.

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Uttiya, Sureeporn, Sirapat Pratontep, Worawan Bhanthumnavin, Radchada Buntem, and Teerakiat Kerdcharoen. "Volatile organic compound sensor arrays based on zinc phthalocyanine and zinc porphyrin thin films." In 2008 2nd IEEE International Nanoelectronics Conference. IEEE, 2008. http://dx.doi.org/10.1109/inec.2008.4585562.

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