Download or read book Design Synthesis Spectroscopy and Hammett Correlation Analysis of Heteroarylethynyl Donor acceptor Porphyrin Systems for Electrooptic Applications written by Tiangao Zhang and published by . This book was released on 2003 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Synthesis Spectroscopy and Photophysical Behavior of Highly Coupled Porphyrin Donor acceptor Systems written by Naomi P. Redmore and published by . This book was released on 2002 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Synthesis and Optoelectronic Properties of Strongly Coupled Porphyrin Based Donor acceptor Systems written by Harry Tetsuo Uyeda and published by . This book was released on 2002 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook Of Porphyrin Science With Applications To Chemistry Physics Materials Science Engineering Biology And Medicine Volumes 6 10 written by Karl M Kadish and published by World Scientific. This book was released on 2010-06-29 with total page 2807 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second set of Handbook of Porphyrin Science.Porphyrins, phthalocyanines and their numerous analogues and derivatives are materials of tremendous importance in chemistry, materials science, physics, biology and medicine. They are the red color in blood (heme) and the green in leaves (chlorophyll); they are also excellent ligands that can coordinate with almost every metal in the Periodic Table. Grounded in natural systems, porphyrins are incredibly versatile and can be modified in many ways; each new modification yields derivatives, demonstrating new chemistry, physics and biology, with a vast array of medicinal and technical applications.As porphyrins are currently employed as platforms for study of theoretical principles and applications in a wide variety of fields, the Handbook of Porphyrin Science represents a timely ongoing series dealing in detail with the synthesis, chemistry, physicochemical and medical properties and applications of polypyrrole macrocycles. Professors Karl Kadish, Kevin Smith and Roger Guilard are internationally recognized experts in the research field of porphyrins, each having his own separate area of expertise in the field. Between them, they have published over 1500 peer-reviewed papers and edited more than three dozen books on diverse topics of porphyrins and phthalocyanines. In assembling the new volumes of this unique Handbook, they have selected and attracted the very best scientists in each sub-discipline as contributing authors.This Handbook will prove to be a modern authoritative treatise on the subject as it is a collection of up-to-date works by world-renowned experts in the field. Complete with hundreds of figures, tables and structural formulas, and thousands of literature citations, all researchers and graduate students in this field will find the Handbook of Porphyrin Science an essential, major reference source for many years to come.
Download or read book The Porphyrin Handbook Volumes 11 20 written by Karl Kadish and published by Academic Press. This book was released on 2003-04-14 with total page 3310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Announcing the sequel to the first ten volumes of The Porphyrin Handbook, which provided an authoritative treatise on the porphryin system and dealt in fine detail with the synthesis, chemistry, spectroscopy, and applications of porphyrins. The ten latest volumes 11-20 address those major disciplinary areas not covered in the first, including biology and medical implications of porphyrin systems, the biosynthesis of porphyrins, chlorophylls and vitamin B12. Other areas include the multitude of genetically transmitted and drug induced diseases associated with errors in heme metabolism, the transformations of hemes into bile pigments, the organic syntheses of bilins, very recent work on phytochrome, and the pathways of degradation of chlorophyll in senescent plants. In addition, volumes 11-20 address every aspect of synthesis, chemistry, structure and spectroscopy of phthalocyanines which will appeal to scientists in fields ranging from mathematics through physics, chemistry and biochemistry, to biology and medicine. . By the same Editors as the successful first Porphyrin Handbook, published in 2000. . Consists of 61 chapters written by internationally recognized experts. . Clear, concise, and uniform presentation with many hundreds of figures, tables and structural formulae. Including volume indices and cumulative index.
Download or read book Handbook of Porphyrin Science Volumes 1 5 With Applications to Chemistry Physics Materials Science Engineering Biology and Medicine written by Karl M. Kadish and published by World Scientific. This book was released on 2010 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first set of Handbook of Porphyrin Science. Porphyrins, phthalocyanines and their numerous analogues and derivatives are materials of tremendous importance in chemistry, materials science, physics, biology and medicine. They are the red color in blood (heme) and the green in leaves (chlorophyll); they are also excellent ligands that can coordinate with almost every metal in the Periodic Table. Grounded in natural systems, porphyrins are incredibly versatile and can be modified in many ways; each new modification yields derivatives demonstrated new chemistry, physics and biology, with a vast array of medicinal and technical applications. As porphyrins are currently employed as platforms for study of theoretical principles and applications in a wide variety of fields, the Handbook of Porphyrin Science represents a timely ongoing series dealing in detail with the synthesis, chemistry, physicochemical and medical properties and applications of polypyrrole macrocycles. Professors Karl Kadish, Kevin Smith and Roger Guilard are internationally recognized experts in the research field of porphyrins, each having his own separate area of expertise in the field. Between them, they have published over 1500 peer-reviewed papers and edited more than three dozen books on diverse topics of porphyrins and phthalocyanines. In assembling the new volumes of this unique Handbook, they have selected and attracted the very best scientists in each sub-discipline as contributing authors of the chapters This Handbook will prove to be a modern authoritative treatise on the subject as it is a collection of up-to-date works by world-renowned experts in the field. Complete with hundreds of figures, tables and structural formulas, and thousands of literature citations, all researchers and graduate students in this field will find the Handbook of Porphyrin Science an essential, major reference source for many years to come. Readership: Chemists, physicists, material scientists, polymer scientists, spectroscopists, electrochemists, electronics and photonics engineers, biochemists, biophysicists, medicinal chemists and clinicians.
Download or read book The Porphyrin Handbook written by Karl Kadish and published by Academic Press. This book was released on 2003-04-14 with total page 3310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Announcing the sequel to the first ten volumes of The Porphyrin Handbook, which provided an authoritative treatise on the porphryin system and dealt in fine detail with the synthesis, chemistry, spectroscopy, and applications of porphyrins. The ten latest volumes 11-20 address those major disciplinary areas not covered in the first, including biology and medical implications of porphyrin systems, the biosynthesis of porphyrins, chlorophylls and vitamin B12. Other areas include the multitude of genetically transmitted and drug induced diseases associated with errors in heme metabolism, the transformations of hemes into bile pigments, the organic syntheses of bilins, very recent work on phytochrome, and the pathways of degradation of chlorophyll in senescent plants. In addition, volumes 11-20 address every aspect of synthesis, chemistry, structure and spectroscopy of phthalocyanines which will appeal to scientists in fields ranging from mathematics through physics, chemistry and biochemistry, to biology and medicine. . By the same Editors as the successful first Porphyrin Handbook, published in 2000. . Consists of 61 chapters written by internationally recognized experts. . Clear, concise, and uniform presentation with many hundreds of figures, tables and structural formulae. Including volume indices and cumulative index.
Download or read book The Porphyrin Handbook written by Karl Kadish and published by Academic Press. This book was released on 1999-10-29 with total page 3607 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists in such fields as mathematics, physics, chemistry, biochemistry, biology, and medicine are currently involved in investigations of porphyrins and their numerous analogues and derivatives. Porphyrins are being used as platforms for the study of theoretical principles, as catalysts, as drugs, as electronic devices, and as spectroscopic probes in biology and medicine. The need for an up-to-date and authoritative treatise on the porphyrin system has met with universal acclaim amongst scientists and investigators. The Porphyrin Handbook represents a timely publication dealing with the recent chemistry, physics, biology, and medicine of porphyrins and related macrocycles. This publication will be a major reference source in this field for the new millennium. Editors are world-renowned experts in their particular fields of physical chemistry, bio-organic chemistry, and organometallic chemistry Consists of several thousand pages of articles written by internationally recognized experts Biological relevance of porphyrins is linked to their chemical, physical, and structural features Clear, concise, and uniform presentation with many hundreds of figures, tables and structural formulae Of interest to theorists, physicists, chemists, biochemists, biologists, and medical scientists
Download or read book Synthesis and Photophysical Properties of Porphyrin containing Supramolecular Systems written by Rashid M. Altamimi and published by . This book was released on 2010 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The self-assembly of organic molecules has attracted much interest because of the special properties and possible technological applications of the mesoscopic materials which are intermediate materials between molecules and solids.1 Structural and spectroscopic studies on J- and H-aggregates present valuable information for understanding interactions at the molecular level in aggregation processes, and may also provide understanding that leads to alternative molecular devices. The synthesis and preliminary photophysical properties of two generations (G1-G2) of glutamic acid-based peptide dendrimers containing free-base or zinc porphyrin at the cores were performed. In this work, steady-state absorption and fluorescence experiments for the free-base dendrimers 59 and 63 were observed to have similar spectra relative H2TPP in DMAc, while the absorption and fluorescence spectra of zinc porphyrin dendrimers 60 and 64 were almost identical to that of ZnTPP in DMAc. These dendrimers tend to not to aggregate in polar solvents like DMAc, therefore, other nonpolar solvents will be sought for self-assembly these dendrimers. Second, two electon donor (D)- acceptor (A) dyads are composed of free-base porphyrin (Fb) and perylene bisimide (PDI) groups that are linked by leucine (65) or polyleucine (n=2, the dyad 66) were prepared in this work. Fb and PDI were chosen because of the useful photophysical properties each exhibits that will enable us to perform both energy and electron transfer within each dyad. The absorption spectra of the dyads indicate a close match with the sum of the component spectra, indicating little or no electronic coupling occurs between porphyrin and PDI groups in the ground state. Due to the overlap of the emission bands of porphyrin and perylene, fluorescence quantum yield analysis could not be determined with any accuracy. Fluorescence excitation spectra will therefore be performed in the near future. Intramolecular FRET experiments will also be achieved on these two dyads, whereas these measurements will allow us to precisely determine the donor-acceptor distance at any given time. After we measure the distance between the donor-acceptor dyad, we will investigate how the rate of the electron transfer varies with the distance, and what effect the dyad structure has in controlling this rate constants. The photophysical and electrochemical properties of covalently-linked arrays of N-confused porphyrins (NCPs) are of interest to a variety of supramolecular and biomimicking materials. While differing from the parent porphyrins by inversion of only two atoms, NCPs exhibit physical and chemical properties different than normal porphyrins. The synthesis and preliminary photophysical properties of three dimeric and trimeric N-confused porphyrin (NCP) arrays (75, 77 and 80) are presented. The absorption and emission maxima for the NCP dimer (75) and trimers (77 and 80) in DMAc were found to be broader and red-shifted relative to that of NC-TPP. The fluorescence quantum yield [Phi]Fl calculated for these NCP arrays were found to be (~ 91-97%) smaller than the monomer NC-TPP. This fluorescence quenching can be attributed to energy-transfer between NCP units. Time-resolved fluorescence experiments will therefore be performed on these NCP arrays in the near future. Here, I also report the synthesis and preliminary characterization of a donor-acceptor triad containing zinc N-confused porphyrin dimer (ZnNCP) 87 and pyridine-appended PDI 95, to generate triad 89. The formation of triad 89 was monitored using UV-visible absorption and fluorescence spectroscopy upon titrating PDI 95 to the ZnNCP dimer 87 in CH2Cl2. The absorption intensity at 462 nm that is attribiuted to the free monomer ZnNCP reached a maximum with the addition of equal amounts of PDI 95 to ZnNCP 87. Further additions of PDI did not result in appreciable changes in the absorption intensity of the Soret and Q bands, confirming the complete dissociation of ZnNCP dimer and formation of the triad complex 88. The fluorescence intensity of ZnNCP monomer reached the maximum upon addition of one equivalent of the PDI 95. The intensity of ZnNCP emission was diminished with addition of access of PDI. The emission quenching with excess PDI addition can be attributed to formation of the penta-coordinate ZnNCP-PDI complex 88. This complex formation will further be investigated by means of time-resolved fluorescence spectroscopy as well as mass spectrometry.
Download or read book The Design and Synthesis of Extended Conjugated Systems written by Shadi Rivadehi and published by . This book was released on 2012 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work contained within this thesis explores the synthetic strategies to several novel conjugated systems derived from porphyrin, NDI and TTF building blocks and their subsequent characterasation. These novel compounds have applicability in studying the factors that govern ET and EnT in interesting redox processes and as sensors. The bulk of research undertaken utilises the easy to prepare porphyrin-dione 44 and TTF 78 as well as tetrabromo NDI 19. Chapter 1 provides an introduction to the motivation for this research. The Chapter also summarises major directions in the fields of porphyrin, NDI and TTF chemistry and defines the significance and role of their properties as well as relevant applications.Chapter 2 explores the synthesis of novel porphyrinogens including oxidation of the porphyrin macrocycle. Core to the strategy is the porphyrin-dione 44. From this dione, porphyrin anhydride 57 and related metallo-porphyrins are synthesised and their physical properties explored. Obtaining porphyrin-lactone 58 as a side product during these reactions led us to synthesis novel lactams 62 and 63. Reaction of porphyrin-lactone 58 with hydrazine-hydrate converts the lactone moiety to an N-aminolactam 62. It also chemically reduces the antipodal pyrrolic moiety in the N-aminolactam, producing the chlorin-like N-aminochlorolactam 63 as well. This lactone-to-lactam replacement does not dramatically change the UV-visible spectroscopic properties of the N-aminolactam 62, however N-aminochlorolactam 63 shows intense Q band at 696 nm, which is larger than that of either of porphyrin-lactone 58 or N-amino-porpholactam 62, and is also shifted to the red region. Chapter 3 investigates the synthesis of novel porphyrin-TTF systems and their metal complexes. A tetrathiafulvalene donor has been annulated to 44 via quinoxaline linkers to form a novel asymmetric dyad 79. Chemical and physical properties are also outlined by utilising different methods such as UV-visible spectroscopy, fluorescence spectroscopy and cyclic voltammetry. These extended [pi]-conjugated molecules absorb light over a wide region of the UV-visible spectrum. Preliminary fluorescence testing of these compounds suggests that electron and/or energy transfer processes take place from the TTF unit as a donor to the porphyrin moiety as an acceptor. Also, cyclic voltametric studies allow the differentiate between the TTF and porphyrin sites with respect to the multiple redox processes occurring within these compounds. X-ray crystallography was used to characterise compound 79, adding to the structural information gained through other characterisation techniques.Chapter 4 investigates the synthesis of a new naphthalene diimide 104, in which a TTF donor has been attached to the naphthalene diimide core via a rigid bridge. The electronic properties of 104 are studied in detail. A strong electronic absorption profile extends far into the visible spectral region, which originates from its inherent electronic donor-acceptor nature. Also, the presence of a strong absorption at 1270 nm upon chemical oxidation, confirms significant [pi]-[pi] interactions in the compound due to aggregation.The work presented in Chapter 5 focused on synthesising of a novel 2,3-dipyrrol-2'-yl-TTF-quinoxaline 123, which is highly selective and sensitive for F- with detection possible by both colorimetric and fluorometric analyses. The target compound 123 was obtained via the direct condensation reaction of 78 with the 2,3-dipyrrol-2'-yl ethanedione 121 in good yield, and then characterized by various methods including X-ray crystallography. The UV-visible spectrum of 123 in DCM shows three strong absorption bands, which change after the addition of fluoride ion. Compound 123 also shows an emission intensity enhancement with slight red shift upon addition of F-, while no significant changes in the spectra of 123 was observed upon addition of AcO-, H2PO4-, Cl-, Br- and HSO4- in the same solvent. Chapter 6 reflects on the work undertaken in Chapters 2-5 and comments on future directions. It also describes some ancillary works to the main themes of this thesis. Synthesis of the NDI-TTF annulated compounds 126 and 127 under mild conditions are detailed, as well as dimer 128, which might have interesting photophysical properties. A new trimer 130 was also synthesised.
Download or read book Photophysical Characterization of a Series of Self assembled Donor acceptor Dyads Containing Porphyrin and N confused Porphyrin Electron Donors and Studies of the Tautomerization of N confused Porphyrins written by Jojo Joseph (Chemist) and published by . This book was released on 2013 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interactions such as pi-pi stacking in organic pi-systems, proton coupling, and hydrogen bonding can be utilized to prepare nanostructures with excellent mechanical and electronic properties. In particular, self-assembled donor-acceptor complexes have received much recent attention because of their potential applications in optoelectronics such as photovoltaic cells and organic light emitting diodes. Porphyrins and their derivatives have been extensively used as building blocks for nanomaterials because of their optical, electronic, catalytic and biochemical properties. The pi-pi stacking and metal coordination ability of porphyrins make them very suitable for the formation of self-assembled structures. The first part of this work involves the photophysical characterization of self-assembled donor-acceptor complexes, where porphyrin derivatives are used as electron donors together with electron acceptors such as naphthalene diimide, perylene diimide, or fullerenes. In the second part, the tautomerization of N-confused tetraphenylporphyrin in various solvents was probed using time-resolved fluorescence spectroscopy.The first part of the work described here is the photophysical characterization of a self-assembled chiral bolaamphiphiles comprised of central tetraphenylporphyrin (H2TPP) with naphthalenediimide (NDI)-lysine moieties flanked on both ends. The strong intermolecular pi-pi interactions between the H2TPP and NDI chromophores leads to the formation of monolayer rings which further stack to form self-assembled nanorods. The effect of local nanostructure of assemblies on the photophysical properties was probed using steady-state fluorescence, time-resolved fluorescence and femtosecond transient absorption spectroscopic studies. This work demonstrates the importance of controlling local nanostructure in modulating the photophysical properties of optoelectronic materials. The second project involves the photophysical characterization of self-assembled donor-acceptor complexes containing an H2TPP and NDI-lysine amphiphile. Strong intermolecular pi-pi interactions between the TPP and NDI chromophores, together with the proton transfer from the lysine head group to the porphyrin ring leads to self-assembly in chloroform. Photoinduced electron transfer in the nanorods was probed using steady state fluorescence, time-resolved fluorescence and femtosecond transient absorption spectroscopic studies. The third portion of this dissertation involves the photophysical characterization of donor-acceptor systems containing covalently bound porphyrin-fullerene dyads, where different numbers (1-4) of C60-fullerenes were attached to a porphyrin core to enhance electron transfer efficiency. In this work, the fluorescence quantum yield measurements, time-resolved fluorescence and femtosecond transient absorption spectroscopic studies were used to study electron-transfer from the porphyrin core to the fullerene group(s). The fourth project involved studies of the equilibrium of the two tautomers of N-confused tetraphenylporphyrins (NCTPP). The steady-state absorption and fluorescence spectra of NCTPP have been found to significantly depend on the nature of the solvent. The previously reported photophysical studies indicated that both NCTPP tautomers can coexist in certain solvents, presumably in equilibrium with one another, while other solvents exclusively prefer one tautomer or the other. In order to gain a better understanding of the NCTPP tautomerization, NCTPP was studied by time-resolved fluorescence spectroscopy in a series of solvents having different solvent parameters. Also examined in this work was the origin of a moderately strong excited state solvent isotope effect in both steady-state and dynamic measurements. In the final project, the spectroscopic properties of a novel self-assembled ZnNCTPP-PDI traid were examined. Donor-acceptor dyads using H2TPP have been examined for years, but studies of D-A dyads based on NCTPP have not been significantly explored. In this project a non-covalently linked D-A complex formed from a zinc N-confused tetraphenylporphyrin dimer [(ZnNCTPP)2] and a pyridyl substituted perylenediimide (Py-PDI-Py) were examined. The coordination of pyridyl group on the PDI with zinc results in the dissociation of the (ZnNCTPP)2 dimer and results in the formation of a ZnNCTPP-Py-PDI-Py-ZnNCTPP triad. Steady-state and time-resolved fluorescence measurements were performed to probe the formation of the triad as well as photoinduced electron transfer in this traid.
Download or read book Handbook of Porphyrin Science written by and published by . This book was released on 2010 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porphyrins, phthalocyanines and their numerous analogues and derivatives are materials of tremendous importance in chemistry, materials science, physics, biology and medicine. They are the red color in blood (heme) and the green in leaves (chlorophyll); they are also excellent ligands that can coordinate with almost every metal in the Periodic Table. Grounded in natural systems, porphyrins are incredibly versatile and can be modified in many ways; each new modification yields derivatives, demonstrating new chemistry, physics and biology, with a vast array of medicinal and technical applications. As porphyrins are currently employed as platforms for study of theoretical principles and applications in a wide variety of fields, the Handbook of Porphyrin Science represents a timely ongoing series dealing in detail with the synthesis, chemistry, physicochemical and medical properties and applications of polypyrrole macrocycles. Professors Karl Kadish, Kevin Smith and Roger Guilard are internationally recognized experts in the research field of porphyrins, each having his own separate area of expertise in the field. Between them, they have published over 1500 peer-reviewed papers and edited more than three dozen books on diverse topics of porphyrins and phthalocyanines. In assembling the new volumes of this unique Handbook, they have selected and attracted the very best scientists in each sub-discipline as contributing authors. This Handbook will prove to be a modern authoritative treatise on the subject as it is a collection of up-to-date works by world-renowned experts in the field. Complete with hundreds of figures, tables and structural formulas, and thousands of literature citations, all researchers and graduate students in this field will find the Handbook of Porphyrin Science an essential, major reference source for many years to come.
