Download or read book Synthesis and Physical Properties of Multiporphyrin Arrays written by Paul Joseph Sintic and published by . This book was released on 2001 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multiporphyrin Arrays written by Dongho Kim and published by CRC Press. This book was released on 2012-01-12 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive review of the fundamentals and applications of multiporphyrin arrays ranging from basic spectroscopic features to a wide range of promising applications such as molecular wires, switches, sensors, artificial photosynthetic devices, and dye-sensitized solar cells based on a variety of multiporphyrin architectures using covalent and/or noncovalent molecular assemblies. Particularly, it focuses on energy and electron transfer processes occurring in multiporphyrin arrays in various environments such as single-molecule level, composite materials, LB films, and solid surface to provide better understanding of photofunctional molecular architectures.

Download or read book The Porphyrin Handbook written by Karl Kadish and published by Academic Press. This book was released on 2000 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Porphyrin Handbook, Volume 18: Multiporphyrins, Multiphthalocyanines and Arrays provides information pertinent to every aspect of the chemistry, synthesis, spectroscopy, and structure of phthalocyanines. This book examines the biology and medical implications of porphyrin systems. Organized into five chapters, this volume begins with an overview of the results obtained in the research concerning the properties and formation of a class of metal phthalocyanine derivatives containing of two macrocyclic units. This text then examines the luminescence and photophysical data of multiporphyrin systems in which the chromophore centers are held together by weak, medium, or strong bonding interactions. Other chapters consider the intensive electronic absorption and circular dichroism properties of chiral phthalocyanines. This book discusses as well the chemistry porphyrin and corrin systems. The final chapter deals with geoporphyrins or sedimentary porphyrins, which are the most abundant porphyrin derivatives on earth. This book is a valuable resource for research scientists, engineers, and clinicians.

Download or read book Synthetic Strategies Towards Covalently Linked Multiporphyrin Arrays written by Amy Rachel Mulholland and published by . This book was released on 2012 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis explores new synthetic methodology for the construction of multiporphyrin arrays. The formation of new carbon-carbon bonds is a unifying theme in all of the syntheses presented as part of this work. Suzuki cross-coupling chemistry and olefin metathesis were explored in the context of synthetic porphyrin chemistry leading to large, multichromophoric systems. Subsequent analysis of the host-guest chemistry of these systems gave insight into cooperative processes and the association kinetics in supramolecular complexes held together by metal-ligand and [pi]-[pi] interactions. Initial work focused on template-directed strategies for the synthesis of cyclic porphyrin arrays. The unusually high affinity of fullerenes for porphyrins inspired the application of C60and C70 to the templated synthesis of two different types of cyclic porphyrin trimer. Olefinmetathesis was selected as the method of reversibly linking the porphyrinic monomers during synthesis, resulting in a product distribution that is largely under thermodynamic control. The fullerene is also believed to have a secondary, kinetic role in the stabilisation of a 3-porphyrintransition state prior to covalent linkage. Varying the solvent composition during the synthesis of the hexa-linked trimer showed that the product yield varied quadratically with the percentage of toluene in dichloromethane/toluene mixtures. This result illustrated the complex and synergistic relationship between solvation, desolvation and cooperative processes in a templated synthesis driven by [pi]-[pi] interactions. Solvent-related differences in the initiation rate of Grubbs' catalyst were also considered in light of this result. The second component of this thesis describes the design of an artificial light harvesting device based on a supramolecular cucurbit[7] uril-methyl viologen inclusion complex with porphyrin units appended to the periphery. Although the synthetic chemistry leading to a covalently-linked cucurbituril-porphyrin conjugate was unsuccessful, several broadly applicable porphyrinic building blocks were developed as part of this work. Recognition processes in multivalent metalloporphyrin hosts were studied using a binding motif based on a biphenyl-linked bisporphyrin. The synthesis of these porphyrin dimers and dyads proceeded via a stepwise approach in which sequential amide and Suzuki couplings gaverise to both homo- and heteroporphyrin dyads in reasonable yields and without the need for extensive purification. The complexation of the Zn(II)/Zn(II) dimer with 4,4'-dipyridyl, 1,2-bis(4-pyridyl)ethane and DABCO was examined, revealing that a 'cyclic' 1:1 complex forms initially and is eventually degraded to the 1:2 complex in the presence of excess ligand. The calculated microscopic binding constants were self-consistent with the Ka values derived from titration of this host with the monotopic ligands pyridine, 4-methylpyridine and quinuclidine. Secondly, the elaboration of this core binding motif with a derivative of C60 was achieved using similar synthetic methodology. Intended as a tunable system where the efficiency of photo induced electron transfer could be studied as a function of donor-acceptor orientation, the host-guest chemistry of this complex was also explored. The K1 values for the formation of a supramolecular tetrad with the bipyridyl ligands were 30-40% lower cf. the model zinc(II) dimer, reflecting competition from the C60 moiety. The binding stoichiometry of the bisporphyrin-C60 triad-DABCO complex was determined by a combined global non-linear regression analysis of UV-vis and fluorescence spectroscopic titration data, revealing the unusual self-assembly of a 2:2 complex.

Download or read book Chemical Synthesis written by C. Chatgilialoglu and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical Synthesis: Gnosis to Prognosis (XTUllKtl ~uv8eoTr ana TT) rVWOT) OTT) npaYVWOT)) " . . . . other things being equal, that field has the most merit which contributes most heavily to, and illuminates most brightly, its neighbouring scientific disciplines[l] One hundred scientists, a blend of students, industrialists, and academics from twenty countries gathered to circumscribe, understand, and elaborate this topic in the magical setting of Ravello, Italy. The mandate of this workshop? To survey existing knowledge, assess current work, and discuss the future directions of chemical synthesis as it impinges on three exciting interdisciplinary themes of science in the 1990's: bioactive molecules, man-made chemical materials, and molecular recognition. This tempting but inexact menu summoned diverse students and scientists who wished to seriously reflect upon, dissect, and eject ideas and own experiences into open debate on this topic, which is at a crossroad in internal evolution and impact on the life and material sciences. The group arrived from many directions and in various forms of transportation, matters soon forgotten, when it found itself in the village which nurtured Wagner's inspiration and set to work immediately to ponder the question which has received extensive thought, prediction, and caveat from illustrious chemists over a period of time [2], two of which, to the delight of all, in presence among the Lectures.

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 Synthesis and Modifications of Porphyrinoids written by Roberto Paolesse and published by Springer. This book was released on 2014-07-08 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: The McMurry Reaction in Porphyrinoid Chemistry, by Kevin M. Smith Meso-tetraarylporphyrins: synthetic strategies and reactivity profiles based on nitro/amino substituents, by Maria da Graça Neves Functionalization of corroles, by José Cavaleiro Degradation pathways for porphyrinoids, by Jacek Wojaczynski Synthetic routes to porphyrinoids, by Sara Nardis Recent developments of non covalent porphyrin assemblies, by Donato Monti

Download or read book Annual Reports in Organic Synthesis 2003 written by Philip M. Weintraub and published by Academic Press. This book was released on 2003-11-24 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first three chapters of this latest volume are organised by reaction type. Later chapters deal with methods of synthesizing heterocyclic systems, the use of protecting groups and synthetically useful transformations. The final chapters deals with reviews and are divided by specific topics. Clearly organised review of synthetically useful information. Emphasize on rapid visual retrieval. Extensive use of references. Beneficial to nearly all organic chemists, both specialists and nonspecialists in synthesis.

Download or read book Synthesis and Physical Properties of Vanadyl Porphyrins written by Edith Arleane Higginbotham and published by . This book was released on 1971 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Porphyrin Handbook written by Karl Kadish and published by Elsevier. This book was released on 2000 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Porphyrin Handbook, Volume 13: Chlorophylls and Bilins: Biosynthesis, Synthesis, and Degradation provides information pertinent to every aspect of the chemistry, synthesis, spectroscopy, and structure of phthalocyanines. This book examines the biology and medical implications of porphyrin systems. Organized into eight chapters, this volume begins with an overview of magnesium chelatase as a complex enzyme involved in the biosynthesis of chlorophyll and bacteriochlorophyll. This text then provides an accurate historical review of the two enzymes involved in photosynthetic pigment production. Other chapters consider the processes that take place in darkness in all plants including angiosperms as the early steps of chlorophyll biosynthesis. This book discusses as well the reactivity and structures of the known chlorophyll catabolites from vascular plants, synthetic sources, and microorganisms. The final chapter deals with the methodologies used for the synthesis of bile pigments. This book is a valuable resource for research scientists, engineers, and clinicians.

Download or read book Fundamentals of Porphyrin Chemistry written by Penelope J. Brothers and published by John Wiley & Sons. This book was released on 2022-06-20 with total page 887 pages. Available in PDF, EPUB and Kindle. Book excerpt: FUNDAMENTALS OF PORPHYRIN CHEMISTRY An indispensable and concise overview of the chemistry of porphyrins and related molecules In Fundamentals of Porphyrin Chemistry: A 21st Century Approach, a team of distinguished researchers delivers a compact and accessible introduction to the broad field of porphyrin chemistry. It discusses the basics of porphyrin synthesis and structure, as well as that of related molecules, and the current and future roles that porphyrins play in chemical transformations, materials design and synthesis, energy capture and transduction, human health, and the environment. This edited volume is a self-contained tutorial on concepts of critical importance to porphyrin chemistry and serves as the foundation for discussions about the applications of porphyrin-related compounds found in the second volume. This book contains: A thorough introduction to porphyrins, including their structure, nomenclature, naturally occurring porphyrins, synthetic porphyrins, and common families of porphyrin-related compounds Comprehensive explorations of chemical porphyrin synthesis, including how to synthesize porphyrins from simple, symmetric, and advanced ABCD-substituted porphyrins Practical discussions of the physical characteristics of porphyrins, including their structural features, electronic structure, spectroscopy, magnetism, electrochemistry, and electron transfer processes Perfect for experienced academic researchers in the field of porphyrin chemistry seeking a quick reference, Fundamentals of Porphyrin Chemistry: A 21st Century Approach is also an indispensable resource for researchers new to the field who need an overview directing them to literature in more focused areas.

Download or read book Handbook Of Porphyrin Science With Applications To Chemistry Physics Materials Science Engineering Biology And Medicine Volumes 31 35 written by Karl M Kadish and published by World Scientific. This book was released on 2014-06-06 with total page 2301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the seventh set of Handbook of Porphyrin Science.Porphyrins, phthalocyanines and their numerous analogue 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 Ladder Polymers written by Yan Xia and published by John Wiley & Sons. This book was released on 2023-05-30 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ladder Polymers An essential reference covering the latest research on ladder polymers Ladder polymers are a unique macromolecular architecture, consisting of a continuous strand of fused rings in their backbones. Such distinctive structures lead to a range of interesting thermal, optical, and electronic properties and self-assembly behaviors, which have been explored for various applications. The book Ladder Polymers: Synthesis, Properties, Applications, and Perspectives presents a collection of diverse topics in ladder polymers consisting of historical overview, state-of-the-art research and development, and potential future directions, written by leading researchers in the related fields. The topics include: Conjugated ladder polymers and graphene nanoribbons Nonconjugated microporous ladder polymers or polymers of intrinsic microporosity Covalent double-stranded polymers Supramolecular double-helical polymers and oligomers Two dimensional polymers This book is a one-stop resource on all the critical research developments in the subject of ladder polymers for broad readership including organic, polymer, and physical chemists, materials scientists and engineers, and chemical engineers.

Download or read book Porphyrins Phthalocyanines and Supramolecular Assemblies written by K. Kadish and published by The Electrochemical Society. This book was released on 2016-09-21 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Carbon Allotropes written by Jeenat Aslam and published by CRC Press. This book was released on 2023-12-12 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of corrosion-resistant coatings using nanostructured materials is developing and growing at a very rapid rate. Carbon Allotropes: Advanced Anticorrosive Coatings Materials summarizes current research and technology on the significance of carbon allotropes in anticorrosive coatings. The book describes the synthesis, characterization, inhibitory mechanism, and industrial applications of carbon allotropes as a corrosion-resistant coating. The usage of carbon allotropes as nanostructure materials based on corrosion-resistant coatings used in contemporary industrial platforms is discussed in this book. Additionally, this book assesses the potential of carbon allotropes as the foundation for corrosion-resistant nanostructure materials and coatings. For scientists and engineers looking for cutting-edge ideas for nanostructures based on carbon allotropes as corrosion-resistant coating materials, this book is an invaluable resource. Salient Features This book covers nanostructured carbon allotropes as materials for corrosion-resistant coatings. The use of carbon allotropes as anticorrosive has revolutionized modern industrial practices. This offers academics and entrepreneurs an influential foundational, interdisciplinary, and primary literature reading. The most cutting-edge coatings based on carbon allotropes are also highlighted, along with current manufacturing and operating challenges. This maintains ongoing research on corrosion-resistant coatings using nanostructured materials while incorporating fresh advancements across the entire area.

Download or read book Proceedings of the International Conference on Colloid and Surface Science written by Y. Iwasawa and published by Elsevier. This book was released on 2001-02-15 with total page 1129 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this Conference was to discuss the results of recent developments and the future prospect in science and technology of the field. The field has been growing and flourishing, while indicating many problems to be uncovered and solved. The conference was structured to encourage interaction and to stimulate the exchange of ideas to accomplish the above purpose. Key issues and materials related to the Conference were included as follows: • Molecular Assemblies in Solutions; • Fine Particles and Colloidal Dispersions; • Supramolecular Organized Films; • Nanostructural Solid Surfaces; • Industrial Applications and Products. The Conference comprised 2 plenary lectures, 42 invited lectures, 150 oral presentations and 266 poster presentations.

Download or read book Directory of Graduate Research written by American Chemical Society. Committee on Professional Training and published by . This book was released on 2005 with total page 1932 pages. Available in PDF, EPUB and Kindle. Book excerpt: Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.