Download or read book Aggregation of Cobalt II Tetrasulfonated Phthalocyanine in Methanol Water Solutions written by and published by . This book was released on 1983 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal complexes of tetrasulfonated phthalocyanine (TSPC) are of interest as oxidation and hydrolysis catalysts for thioethers and organophosphonates. Since metal TSPC complexes aggregate in aqueous solution, it was necessary to determine the dimerization constant as a prerequisite to establishing the efficiency of the monomeric TSPC complexes as catalysts. Since these complexes will be used in mixed solvents to dissolve thioethers, the aggregation of the Cobalt (II) TSPC (CoTSPC) was measured in methanol-water solutions at various temperatures. The dimerization constant was determined by a nonlinear least-squares fit of absorbance versus concentration of CoTSPC. Values of the molar absorption coefficients for the monomer and dimer at 662 nm are 9.6 + or - 100,000/M and 7.5 + or - 80,000/M/cm, respectively, with the error representing the standard deviation of four solutions measured at five-degree intervals over the range 15-45 C. The dimerization of CoTSPC in the presence of methanol was measured over the same temperature range with methanol percent mole fraction from 0.4 to 9.8. The temperature dependence of the free energy of dimerization in methanol-water was expressed as delta F = A + BT + CT sq. indicating that the heat capacity of dimerization was linearly dependent on temperature. In pure water the heat capacity of dimerization was zero.
Download or read book Phthalocyanine Research and Applications written by Arthur L. Thomas and published by CRC Press. This book was released on 1990-05-24 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this monograph is to provide a summary for those who are active in the field of phthalocyanine research. This volume allows the reader to quickly-and at a reasonable cost-determine what is being accomplished so that he may plan his own research programs. It covers such topics as synthesis, reactions, inks, energy systems, coatings, toners, and electrophotographic plates and developers, just to name a few. Packed with over 40 structural drawings of phthalocyanine molecules, this one-of-a-kind reference provides the necessary description and visualization to stimulate further research. This work is an indispensable resource for researchers and practitioners, both novice and experienced, in the field of phthalocyanine science and technology.
Download or read book Dimerization of Cobalt II Tetrasulfonated Phthalocyanine in Water and Aqueous Alcohol Solutions written by Y. C. Yang and published by . This book was released on 1985 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal complexes of tetrasulfonated phthalocyanine (TSPC) are of interest as oxidation and hydrolysis catalysts for thioethers and organophosphonates. Since metal TSPC complexes aggregate in aqueous solution, it was necessary to determine the dimerization constant as a prerequisite to establishing the efficacy of the monomeric Cobalt (II) TSPC (CoTSPC) complex as a catalyst. Since these potential catalysts will be used in mixed solvents to dissolve thioethers, the aggregation of CoTSPC was measured in alcohol-water solutions at various temperatures. This study uses a nonlinear, least-squares program to compute best-fit molar absorbances for monomers and dimers simultaneously. In addition, the monomer-dimer equilibrium is investigateed over a wide temperature range, 5-75 C, in water to determine if the standard enthalpy of formation varies with temperature. It was found that the enthalpy was temperature-dependent, possessing a constant value of Delta C subscript p deg. of 0.1 kcal/mole-K. It was also shown that earlier investigators deduced dimerization constants that were smaller than the ones reported in this investigation. We feel this was caused by the presence of higher aggregates and unwarranted assumptions in the method to estimate the dimerization constant. It is also shown that the dye, CoTSPC, behaves as typical non-aqueous solute, and that hydrophobic bonding is not involved in the formation of the dimer. Originator supplied keywords include: Cobalt (II) complexes; Monomer-dimer equilibria; Thermodynamics; Methanol-water solution; Dyestuffs; Tetrasulfonated and Phtalocyanine.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1984 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1984 with total page 1520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Download or read book The Porphyrin Handbook Volume 3 written by Karl Kadish and published by Elsevier. This book was released on 2000 with total page 472 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.
Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1984 with total page 1528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Visible Light on the Dimerization of Cobalt II Tetrasulfonated Phthalocyanine in Water written by R. P. Seiders and published by . This book was released on 1983 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is no evidence that visible light from a spectrophotometer alters the dimerization of CoTSPC. This means that previous determinations of the dimerization constant were unaffected by light from the spectrophotometer, and it raises doubt as to whether visible light enhances disaggregation of CoTSPC as claimed by prior researchers.
Download or read book The Porphyrin Handbook written by Karl Kadish and published by Elsevier. This book was released on 2000 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Porphyrin Handbook, Volume 17: Phthalocyanines: Properties and Materials 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 effects of pressure, temperature, electromagnetic radiation, and particle impact on phthalocyanines. This text then examines. Other chapters consider the research on phthalocyanine thin films, with emphasis on studies that are concerned primarily with film structures. This book discusses as well the nature of the phthalocyanine aggregation process, how an aggregate is defined, and the issues of its bonding and structure. The final chapter deals with the advances in the design of composites of phthalocyanines or porphyrins and inorganic hosts and some of the most significant finding in the catalysis with these systems. This book is a valuable resource for research scientists, engineers, and clinicians.
Download or read book Optical Spectra of Phthalocyanines and Related Compounds written by Hiroaki Isago and published by Springer. This book was released on 2015-05-18 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book displays how optical (absorption, emission, and magnetic circular dichroism) spectra of phthalocyanines and related macrocyclic dyes can be varied from their prototypical ones depending on conditions. As these compounds can be involved in colorful chemistry (which might be driven by impurities in solvents), their spectra behave like the sea-god Proteus in their mutability. Therefore, those who have been engaged with phthalocyanines for the first time, including even educated professional researchers and engineers, may have been embarrassed by the deceptive behavior of their compounds and could have, in the worst cases, given up their projects. This book is aimed not merely at reviewing the optical spectra, but also at helping such people, particularly beginners, to figure them out by showing some examples of their prototypical spectra and their variations in several situations. For the purpose of better understanding, the book also provides an introduction to their theoretical backgrounds as graphically as possible and without mathematicization for readers who are weak in mathematics.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Functional Phthalocyanine Molecular Materials written by Jianzhuang Jiang and published by Springer. This book was released on 2010-02-02 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phthalocyanines exhibit intriguing physic-chemical properties that render them important as a class of molecular functional materials. In addition to their traditional applications as dyes and pigments, more recently their use as the organic semiconductors, photodynamic therapy medicines, non-linear optical materials, catalysts for the photo oxidation, optical recording materials, and gas sensors attracts great research interests in these tetrapyrrole species.
Download or read book Direct Methanol Fuel Cells written by Antonio Salvatore Aricò and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with an analysis of materials issues, status of technologies and potential applications of direct methanol fuel cells. The principle of operation of direct methanol fuel cells and the status of knowledge in the basic research areas are presented. The technology of direct methanol fuel cells is discussed in this book with particular regard to fabrication methodologies for the manufacturing of catalysts, electrolytes membrane-electrode assemblies, stack hardware and system design.
Download or read book The Porphyrin Handbook written by Karl Kadish and published by Elsevier. This book was released on 2012-12-02 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Porphyrin Handbook, Volume 14: Medical Aspects of Porphyrins 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 12 chapters, this volume begins with an overview of the underlying diagnostic features, mechanisms, and available treatments of erythropoietic disorders due to defective heme biosynthesis. This text then examines the physiopathology of acute intermittent porphyria, which is transmitted as autosomal dominant disorders with incomplete penetrance. Other chapters consider the main characteristics of congenital erythropoietic porphyria, which includes an increased synthesis, accumulation, ad excretion of porphyrins. This book discusses as well the biochemistry, pathophysiology, and clinical features of variegate porphyria in the light of several essential advances in the understanding, management, and diagnosis of variegate porphyria. The final chapter deals with the legal use of herbal and complementary medicines. This book is a valuable resource for research scientists, engineers, and clinicians.
Download or read book The Phthalocyanines written by Frank H. Moser and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Intrinsically Conducting Polymers An Emerging Technology written by M. Aldissi and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the majority of the papers presented at the NATO Ad vanced Research Workshop (ARW) held in Burlington, Vermont, USA on October 12-15, 1992. This ARW was the first of its kind to address the subject of intrinsically conducting polymers with an emphasis on processing and technological applications. The NATO ARW format was followed in that the subjects addressed here were limited in number but discussed in detail with the attendance being limited to a small number of selected scientists. The ARW brought together lecturers who are leaders in their respective fields from a wide range of NATO and non-NATO countries (a total of 11 countries) with the support of the NATO Scientific Affairs Division and some support from Champlain Cable Corporation. The total number of par ticipants was 33 and the number of presentations was 24. The speakers were chosen based on the topics selected for this workshop and repre sented industry, universities and government laboratories. The field of conducting polymers has grown rapidly during the past few years with important developments in materials processing and fabrica tion that brought about active research programs focusing on the use of these polymers as "smart" materials in technological applications and devices in academic and industrial research laboratories.
Download or read book Comprehensive Coordination Chemistry II written by J. A. McCleverty and published by Newnes. This book was released on 2003-12-03 with total page 11845 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Coordination Chemistry II (CCC II) is the sequel to what has become a classic in the field, Comprehensive Coordination Chemistry, published in 1987. CCC II builds on the first and surveys new developments authoritatively in over 200 newly comissioned chapters, with an emphasis on current trends in biology, materials science and other areas of contemporary scientific interest.
