Hybrid Porphyrin Research Articles

Molecular Assembly of Zinc–Nickel Hybrid Porphyrin Dimer Using Synthetic 4α-Helix Polypeptides

Abstract Molecular assembly of hybrid porphyrin dimer containing zinc and nickel mesoporphyrins using synthetic 4α-helix polypeptides induced an efficient energy-transfer between the porphyrins due to the presence of the polypeptide.

Synthesis of meso-meso linked hybrid porphyrin arrays by Pd-catalyzed cross-coupling reaction.

meso-meso linked porphyrin arrays of a variety of compositions and connectivities have been prepared by Pd-catalyzed cross-coupling reaction in a manner complementary to Ag(I)-promoted oxidative coupling. [reaction: see text]

‘Axial-bonding’ type hybrid porphyrin trimers: Novel multichromophoric arrays for photoinduced electron- and energy transfer

‘Axial-bonding’ type hybrid porphyrin trimers: Novel multichromophoric arrays for photoinduced electron- and energy transfer

Synthesis and Characterization of Hybrid Porphyrin Dimers and Halogenated Porphyrin Dimers

Abstract Zinc hybrid porphyrin dimer(ZnTTP-C2-H2PFPP, ZnTTP-C2-H2TTP, ZnPFPP-C2-H2PFPP, and ZnPFPP-C2-H2TTP) and manganese (III) halogenated porphyrin dimers (MnPFPP-C2-MnPFPP, MnPFPP-C2-MnDCPP, and MnDCPP-C2-MnDCPP) covalently bridged by an ethylene moiety (<SCHMR TYPE="T" SID="" RID="S01">) were synthesized and characterized by UV-vis spectra, fluorescence spectra, and cyclic voltammograms. These porphyrin dimers could be embedded into the lipid bilayers of a liposomal membrane. The redox potential of the manganese complex for the halogenated porphyrin dimers increased with increasing of halogen portions on the porphyrin rings. An efficient energy transfer of the excited singlet state in the covalently-linked zinc hybrid dimers from zinc porphyrin to a free base porphyrin was observed, depending on the porphyrin structure. Furthermore, the manganese halogenated porphyrin dimers acted as catalysts of transmembrane electron transfer; such activity depends on the steric effect of halogen portions on the porphyrin ring.

‘Axial-bonding type’ hybrid porphyrin trimers: design, synthesis and modulation of redox and photophysical properties

Utilising the axial bond formation capability of a phosphorus(V) porphyrin, new hybrid porphyrin trimers are readily synthesised and a systematic control of their redox and photophysical properties demonstrated.

A time-resolved ESR study on triplet-triplet energy transfer processes in a copper(II)-free-base porphyrin dimer

Energy transfer from a copper porphyrin moiety to its free-base partner is observed in a copper(II)-free-base hybrid porphyrin dimer. By the measurements of T-T transient absorption spectra in toluene, the triplet yield of the free-base porphyrin was found to be increased in the hybrid dimer compared with that in a monomeric free-base porphyrin. Time-resolved ESR study revealed that this intramolecular energy transfer occurs between the triplets. From the simulation of the TR-ESR spectrum, the mean value of the dihedral angle between the donor and the acceptor is estimated as 30 degrees.

Dodecaphenylporphyrin. Unusual optical properties of a novel sterically hindered hybrid porphyrin

A newly synthesized hybrid porphyrin, dodecaphenylporphyrin, shows unusual optical absorption and fluorescence characteristics indicative of porphyrin-ring distortion caused by steric constraint of the twelve phenyl groups.

Spin-density distributions in meso-alkyl/aryl hybrid porphyrin cation radicals

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-density distributions in meso-alkyl/aryl hybrid porphyrin cation radicalsMichael Atamian, Richard W. Wagner, Jonathan S. Lindsey, and David F. BocianCite this: Inorg. Chem. 1988, 27, 8, 1510–1512Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1 April 1988https://doi.org/10.1021/ic00281a040RIGHTS & PERMISSIONSArticle Views115Altmetric-Citations14LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (347 KB) Get e-Alerts Get e-Alerts

ChemInform Abstract: Rothemund and Adler‐Longo Reactions Revisited: Synthesis of Tetraphenylporphyrins Under Equilibrium Conditions.

We present a new synthetic strategy for preparing tetraphenylporphyrins that should greatly expand synthetic entries into porphyrin containing model systems. Pyrrole and the desired benzaldehyde react reversibly at room temperature with trace acid catalysis to form the cyclic tetraphenylporphyrinogen at thermodynamic equilibrium. An oxidant is then added to irreversibly convert the porphyrinogen to the porphyrin. The greater stability of the cyclic porphyrinogen over the open-chain polypyrrylmethanes occurs when the reaction is performed at moderate dilution (10-2 M). The reaction at high dilution or high concentration affords a negligible yield of the cyclic porphyrinogen. Porphyrinogen exchange reactions provide proof of equilibrium. This methodology is complementary to the Adler-Longo procedure, allowing small quantities of porphyrins to be prepared from sensitive aldehydes in 30-40% yield without difficult purification problems. This methodology is also extended to the preparation of meso-tetraalkylporphyrins and one hybrid porphyrin containing both aryl and alkyl substituents. The mild reaction conditions and convenience of this method permit consideration of new design strategies in preparing complex porphyrins.

Triplet state sensitization of covalently linked hybrid porphyrin dimers. Evidence for intramolecular triplet energy transfer

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriplet state sensitization of covalently linked hybrid porphyrin dimers. Evidence for intramolecular triplet energy transferHaim. Levanon, Ayelet. Regev, and P. K. DasCite this: J. Phys. Chem. 1987, 91, 1, 14–16Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 January 1987https://doi.org/10.1021/j100285a006RIGHTS & PERMISSIONSArticle Views80Altmetric-Citations17LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (400 KB) Get e-Alerts

The effect of mutual orientation on the triplet state magnetization of covalently linked hybrid porphyrin dimers

We report laser excitation-time-resolved EPR spectroscopy on the transient triplet magnetization of covalently linked hybrid porphyrin dimers, Zn(-CH 2-) n H 2, oriented in a uni-axial liquid crystal at 100 K. Three dimers are investigated: for n = 3, the para-para and ortho-ortho, and for n = 6, the ortho-ortho. Selective singlet excitation of the dimer components reveals intramolecular singlet energy transfer rates, k et = 1.5 × 10 9 s −1 for both the ortho-ortho compounds, and 4.7 × 10 8 s −1 for the para-para compound.

Energy transfer and fine structure axes determination in a hybrid porphyrin dimer oriented in a liquid crystal. Time resolved triplet EPR spectroscopy

A study of laser photoexcitation-EPR diode detection of the transient triplet state of the hybrid covalenty linked porphyrin dimer [ZnP–H2P] in a uniaxial liquid crystal and a glass matrix at 100 and 10 K, is reported. This time resolved technique enables monitoring the transient behavior of the magnetization until thermal relaxation sets in. Selective singlet excitation of the dimer components reveals a singlet energy transfer process [ZnP*−H2P]–––ket→ZnP–H2P*, whose rate at 10 K is calculated to be [1.0±0.2]×109 s−1. Triplet line shape analysis of the subunit monomer triplet and the dimer yields: (a) the location of the fine structure tensor axes in the molecular frame (X, Y along the pyrrole nitrogens and Z perpendicular to the porphyrin plane); consequently, the signs of the parameters D and E are found to be positive for the monomeric free base and the dimer; (b) the ratio of the sublevel population rates; and (c) the spin-lattice relaxation rate.