Download or read book Synthesis and Photoconducting Properties of Molecular and Polymeric Rhenium Diimine Complexes written by Sze-man Lam (Lillian) and published by . This book was released on 2002 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Photoconducting Properties of Molecular and Polymeric Rhenium Diimine Complexes written by 林思敏 and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Synthesis and Photoconducting Properties of Molecular and Polymeric Rhenium Diimine Complexes" by 林思敏, Sze-man, Lillian, Lam, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3124324 Subjects: Rhenium compounds Photoconductivity
Download or read book Study of Photosensitizing Properties in Some Rhenium Diimine Complex Containing Polymers written by Ching-Sum Hui and published by . This book was released on 2017-01-28 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Study of Photosensitizing Properties in Some Rhenium Diimine Complex Containing Polymers" by Ching-sum, Hui, 許正心, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "STUDY OF PHOTOSENSITIZING PROPERTIES IN SOME RHENIUM DIIMINE COMPLEX CONTAINING POLYMERS" Submitted by Hui Ching Sum for the degree of Master of Philosophy at The University of Hong Kong in July 2003 Polyurethanes incorporated with chlorotricarbonyl rhenium(I) 1,4-diaza-1,3-butadiene (DAB) complexes were synthesized and their photosensitizing properties were studied. The polymers exhibited low photoconductivity in spite of the high rhenium complex content. The rhenium complexes in the polymers can act as good photosensitizers but poor charge transport units. Therefore, electron-accepting dibutyl or dioctyl viologens were doped into the polymer matrix in order to enhance the photoconductivity. The polymers exhibited interesting solid state morphologies and solution properties. Gel permeation chromatography (GPC) and transmission electron microscopy (TEM) results suggested the formation of polymer aggregates in both solution and solid states. The polymers could act as probes for metal ions. The addition of metal ions to these polymer solutions led to significant changes in the electronic absorption properties. This was attributed to the interactions between the polyether moieties and metal ions. Chlorotricarbonyl rhenium bis(arylimino)acenaphthene (DIAN) complex containing poly(p-phenylenevinylene)s (PPV) were prepared by the palladium- catalyzed Heck coupling reaction using p-divinylbenzene and chlorotricarbonylrhenium(I) bis(4-iodophenylimino)acenaphthene as the monomers. It was found that the iodide generated in situ can displace the chloride ligand in the rhenium complex. Therefore, lithium chloride was added to suppress the halide exchange reaction. Photocurrent and photovoltaic measurements proved that the balance in the amount of rhenium complex and charge transport species in conjugated polymers was essential to the photosensitization process. In the photovoltaic devices fabricated, poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT: PSS) and 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) were used as the hole and electron transport layers, respectively. It was -2 found that the best device exhibited a power conversion efficiency up to 6.1 10 %. Titanium dioxide (TiO ) was doped into the PPV with the highest rhenium content for further improvement of photovoltaic properties. In addition, the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels of the polymers were estimated by cyclic voltammetry. The halide exchange process was examined by synthesizing a series of model compounds. The axial chloride ligand was displaced by bromide or iodide ligands during the course of the Heck coupling reaction. In the model reactions, tetrabutylammonium halide (nBu NI or nBu NBr) acted as the source of halide in 4 4 replacing the axial chloride ligand in [Re(CO) Cl(DIAN)]. The addition of lithium chloride suppressed the halide exchange. Large amounts of nBu NI and long reaction times drove the ligand exchange process to the product side. The axial halide ligand exerted a significant effect on the solvatochromism and redox behavior, which resulted from the change in the lowest excited states from metal-to-ligand charge transfer (MLCT) to ligand-to-ligand charge transfer (LLCT) character when the axial chloride ligand was replaced by io
Download or read book Synthesis and Photosensitizing Properties of Sublimable Rhenium Diimine Complexes written by Hei-Ling Wong and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Synthesis and Photosensitizing Properties of Sublimable Rhenium Diimine Complexes" by Hei-ling, Wong, 黃喜玲, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled SYNTHESIS AND PHOTOSENSITIZING PROPERTIES OF SUBLIMABLE RHENIUM DIIMINE COMPLEXES Submitted by Wong Hei Ling for the degree of Doctor of Philosophy at The University of Hong Kong in January 2007 Two series of rhenium diimine complexes based on bis(phenylimino)acenaphthene-derived and benzothiazole-derived ligands were synthesized and their uses in fabricating highly efficient photovoltaic devices are presented. The electronic absorption bands, highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of these rhenium complexes could be modified easily by changing the structure of ligands. These rhenium complexes were used as the photosensitizers in photovoltaic cells. A series of multilayer bulk heterojunction photovoltaic devices with the device structure ITO/CuPc/Complex: C /C /Al (ITO = indium tin oxide coated glass, 60 60 and CuPc = copper phthalocyanine) based on different rhenium complex photosensitizers co-deposited with C in the active layer was fabricated. ITO 60 serves as the anode and Al as the cathode. CuPc and C were used as the hole and 60 electron transport materials, respectively. The complexes are thermally stable and can be processed by thermal evaporation under high vacuum. Multilayer thin films with very good optical quality and smooth surface morphology were prepared. The effects of varying the hole transport material, thickness of hole transport material, rhenium complex photosensitizer, mixed layer thickness, active layer composition, and light intensity to the performance of the photovoltaic cells were studied systematically. It was found that the short-circuit current (I ) and SC fill-factor (FF) could be significantly affected by varying the device configuration. However no significant change in the open-circuit voltage (V ) was observed., OC For the devices fabricated from rhenium diimine complexes based on bis(phenylimino)acenaphthene-derived ligands, it was found that the highest power conversion efficiency (η ) was achieved for the bulk heterojunction photovoltaic device ITO/CuPc(10 nm)/Complex: C [3:7](125 nm)/C (10 60 60 nm)/Al(60 nm), in which bis(phenylimino)acenaphthene rhenium tricarbonyl chloride was used as the photosensitizer. The highest I and η were measured to SC p be 5.97 mA/cm and 1.40 %, respectively under air mass (AM) 1.5 simulated solar light illumination (100mW/cm ). For the devices fabricated from rhenium diimine complexes based on benzothiazole-derived ligands, it was found that the optimized device structure was ITO/CuPc(10 nm)/Complex: C [4:6](150 60 nm)/C (10 nm)/Al(60 nm), in which 1-(2-benzothiazolyl)isoquinoline rhenium 60 tricarbonyl chloride was used as the photosensitizer. The highest I and η were SC p measured to be 5.71 mA/cm and 1.72 %, respectively. The role of these rhenium complexes in the photosensitization process was studied by measuring the incident photon to current efficiency (IPCE) at different wavelengths. The photocurrent response agreed well with the absorption spectra of the rhenium complexes, CuPc, and C . This suggests that all these compounds are playing important roles as the 60 photosensitizers in the photovoltaic cell and essential to the photovoltaic process. DOI: 10.5353/th_b3786589 Subjects: Rhenium compounds - Synthesis Photosensitizing compounds Photovoltaic
Download or read book Synthesis and Characterization of Some Rhenium Complexes written by Joseph Brian Scott and published by . This book was released on 2009 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polyimides and Other High Temperature Polymers Synthesis Characterization and Applications volume 2 written by Kash L. Mittal and published by CRC Press. This book was released on 2003-03-01 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume documents the proceedings of the Second International Symposium on Polyimides and Other High Temperature Polymers: Synthesis, Characterization and Applications, held in Newark, New Jersey, December 3-6, 2001. Polyimides possess many desirable attributes, so this class of materials has found applications in many technologies ranging from
Download or read book Springer Handbook of Inorganic Photochemistry written by Detlef Bahnemann and published by Springer Nature. This book was released on 2022-06-25 with total page 1914 pages. Available in PDF, EPUB and Kindle. Book excerpt: The handbook comprehensively covers the field of inorganic photochemistry from the fundamentals to the main applications. The first section of the book describes the historical development of inorganic photochemistry, along with the fundamentals related to this multidisciplinary scientific field. The main experimental techniques employed in state-of-art studies are described in detail in the second section followed by a third section including theoretical investigations in the field. In the next three sections, the photophysical and photochemical properties of coordination compounds, supramolecular systems and inorganic semiconductors are summarized by experts on these materials. Finally, the application of photoactive inorganic compounds in key sectors of our society is highlighted. The sections cover applications in bioimaging and sensing, drug delivery and cancer therapy, solar energy conversion to electricity and fuels, organic synthesis, environmental remediation and optoelectronics among others. The chapters provide a concise overview of the main achievements in the recent years and highlight the challenges for future research. This handbook offers a unique compilation for practitioners of inorganic photochemistry in both industry and academia.
Download or read book Diimine Complexes of Ruthenium ii Rhenium i and Iron ii from Synthesis to DFT Studies written by R. A. Kirgan and published by . This book was released on 2007 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Author's abstract] The chloro and pyridinate derivatives of rhenium(I) tricarbonyl complexes containing the diimine ligands 2,2'-bipyrazine (bpz) and 5,5'-dimethyl-2,2'-bipyrazine (Me2bpz) are discussed. When compared to similar rhenium(I) tricarbonyl complexes of 2,2'-bipyridine (bpy) and 2,2'-bipyrimidine (bpm), the Me2bpz complexes are comparable to bpm derivatives and their properties are intermediate between those of bpy and bpz complexes. Also discussed is the synthesis and properties of two new analogues of ruthenium(II) tris-bipyridine, a monomer and dimer. The complexes contain the ligand 6,6'-(1,2-ethanediyl)bis-2,2'-bipyridine (O-bpy) which contains two bipyridine units bridged in the 6,6' positions by an ethylene group. Crystal structures of the two complexes formulated as [Ru(bpy)(O-bpy)](PF6)2 and [(Ru(bpy)2)2(O-bpy)](PF6)4 reveal structures of lower symmetry than D3 which affects the electronic properties of the complexes as revealed by Density Functional Theory (DFT) and Time Dependent Density Functional Theory (TDDFT) calculations. Iron(II) tris-bipyrazine undergoes dissociation in solution with loss of the three bipyrazine ligands. The rate of the reaction in acetonitrile depends on the concentration of anions present in the solution. The rate is fastest in the presence of Cl- and slowest in the presence of Br-. In a second discussion DFT calculations are used to explore four iron(II) diimine complexes. DFT calculations show the higher energy HOMO (highest occupied molecular orbital) orbitals of the four complexes are metal centered and the lower energy LUMO (lowest unoccupied molecular orbitals) are ligand centered.
Download or read book Synthesis and Photosensitizing Properties of Sublimable Rhenium Diimine Complexes written by Hei-ling Wong and published by . This book was released on 2007 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and Synthesis of Luminescent Rhenium i and Ruthenium ii Diimine Complexes for the Recognition of Ions and Small Molecules by Host Guest Interactions written by 紀思輝 and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Design and Synthesis of Luminescent Rhenium(I) and Ruthenium(II) Diimine Complexes for the Recognition of Ions and Small Molecules by Host-guest Interactions" by 紀思輝, Sze-fai, Alex, Kai, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123866 Subjects: Rhenium compounds - Synthesis Ions Molecular recognition
Download or read book Molecular and Polymeric Metal Complexes for Electroluminescence Applications written by 伍寶琼 and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Molecular and Polymeric Metal Complexes for Electroluminescence Applications" by 伍寶琼, Po-king, Ng, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "MOLECULAR AND POLYMERIC METAL COMPLEXES FOR ELECTROLUMINESCENCE APPLICATIONS" submitted by Ng Po King For the degree of Doctor of Philosophy at the University of Hong Kong in August 1999 Different types of ruthenium or rhenium containing light-emitting conjugated polymers based on derivatives of poly(p-phenylenevinylene), poly(p-phenylene), and poly(phenylene thiophene) have been synthesized. The conjugated mainchain were functionalized with different electron-withdrawing ligands such as dipyridophenazine, oxadiazole, and phenanthroline. Their opto-electronic properties were studied By combining an efficient electron-transporting segment, a hole-transporting segment, and an emissive unit in a single polymer chain with optimized composition, the resulting polymer might possess balanced hole and electron transporting properties and thus enhance the associated electroluminescence efficiency. The metal containing polymerswere synthesized by palladium catalyzed coupling reactions. The properties of the polymers can be adjusted by changing the proportion of different monomers. Apart from the polymeric materials, several trifunctional light-emitting molecules based on rhenium(I) and ruthenium(II) bipyridine complexes were studied. The hole-transporting, electron-transporting, and light-emitting functional groups are incorporated into one single molecule. The complexes were doped in different polymer hosts and their charge transport and luminescent properties were studied. The charge transports of all polymeric and molecular materials are dispersive in nature with non-Gaussian carrier distribution. It was also found that the hole and electron carrier mobilities are similar and of the order of lO DEGREESlO"5 crn DEGREESV''V1, which are both electric field and temperature dependent. The plots of In ju vs. Em show that the charge carrier mobilities decrease with increasing electric field, which suggests the presence of the off-diagonal disorder in the hopping sites. In general, the electron carrier mobilities are slightly higher than those of the hole carrier. This may due to the participation of the electron-withdrawing ligand. Moreover, the electron and hole mobilities of the metal containing polymers are approximately one order of magnitude higher than those of the metal free polymers. This is attributable to the presence of ruthenium complexes which play an important role as charge carrier. The light emitting properties of the polymeric and molecular materials are reported. In some polymers, the emission properties were influenced by the metal complexes and their content. An energy transfer process between the polymer main- chain and the metal center is proposed. Single layer light emitting devices were fabricated and subjected to forward bias. The electroluminescent spectral features resemble those of the photoluminescent spectra, indicating the same type of excitationsand energy bands involved in both photoexcitation and carrier injection by external voltage. Depending on the metal complex content, the polymers exhibit different EL spectra. The devices exhibit low turn-on voltage (5-10 V) and external quantum efficiency of 0.15-0.6 %. By using different metal complex monomers, it is capable of preparing metal-containing polymers with different emission colors and charge transport properties. DOI: 10.5353/th_b2986630 Subjects: Polymeric composites Electrolumi
Download or read book Design and Synthesis of Luminescent Rhenium I and Ruthenium II Diimine Complexes for the Recognition of Ions and Small Molecules by Host guest Interactions written by Sze-fai Kai (Alex) and published by . This book was released on 1999 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Fluorescence and in Vitro Cytotoxicity Studies of Some Rhenium I Diimine Complexes written by David H. Orsa and published by . This book was released on 2010 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cancer is the leading cause of death in the world. There are conventional methods for cancer treatment, but each has its limitations or drawbacks. These circumstances have led researchers to look for new cytotoxic agents which could be used for cancer treatment. Here, convenient one-pot synthesis of several photoluminescent rhenium(I) diimine complexes and their screening for anticancer properties are presented. The rhenium(I) complexes include fac-(CO)3(Bipy)ReCl (1), fac-(CO)3(Phen)ReCl (2), fac-(CO) 3(2,9-Me2Phen)ReCl (3), fac-(CO) 3(2,9-Me2-4,7-Ph2Phen)ReCl (4), (CO) 3(Quinox)Re(mu-OC5H11)2Re(CO) 3-(Quinox) (5), [(CO)3Re(mu-OC5H 11)2Re(CO)3]2(mu-Pyrazine)2 (6), [(CO)3Re(mu-OC5H11) 2Re(CO)3]2(mu-4,4'-Bipy)2 ( 7), and [(CO)3(2,9-Me2Phen)Re(mu-H)Re(2,9- Me2Phen)(CO)3]+[(CO)3Re (mu-OC 5H11)3Re(CO)3]- ( 8). The complexes have been characterized using spectroscopic techniques and the molecular structures of 3-8 have been confirmed through X-ray crystal structure determinations. As expected, these complexes exhibit fluorescence. The anticancer properties of 1-8 are evaluated using the human prostate cancer cell line (PC-3) and breast cancer cell line (MCF-7A). The results of this study demonstrate that these complexes have significant anticancer properties. For example, the complex 6 is highly effective against MCF-7A and the complex 1 is highly effective against PC-3. Therefore, these complexes can potentially find applications in the treatment of some cancers.-- Abstract.
Download or read book Study of Photosensitizing Properties in Some Rhenium Diimine Complex Containing Polymers written by Ching-sum Hui and published by . This book was released on 2003 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chromic Phenomena 3rd Edition written by Peter Bamfield and published by Royal Society of Chemistry. This book was released on 2018-08-24 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chromic or colour related phenomena are produced in response to a chemical or physical stimulus. This new edition will update the information on all those areas where chemicals or materials interact with light to produce colour, a colour change, or luminescence especially in the imaging, analysis, lighting and display areas. The book has been restructured to show greater emphasis on applications where 'coloured' compounds are used to transfer energy or manipulate light in some way therefore reducing the details on classical dyes and pigments. In the past eight years, since the previous edition, there has been a remarkable increase in the number of papers and reviews being produced reflecting the growth of interest in this area. This ongoing research interest is matched by a large number of new technological applications gaining commercial value covering e.g. biomedical areas, energy, data storage, physical colour, bio-inspired materials and photonics. This book appeals to industrial chemists, professionals, postgraduates and as high level recommended reading for colour technology courses.
Download or read book Nanoscale Phenomena written by Zikang Tang and published by Springer Science & Business Media. This book was released on 2007-11-22 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book collects selected lectures from the Third Workshop of the Croucher Advanced Study Institute on Nano Science and Technology, and showcases contributions from world-renowned researchers. The book presents in-depth articles on the latest developments in nanomaterials and nanotechnology, and provides a cross-disciplinary perspective covering physics and biophysics, chemistry, materials science, and engineering.
Download or read book Greenhouse Gas Carbon Dioxide Mitigation written by Martin M. Halmann and published by CRC Press. This book was released on 1998-11-23 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Any mention of the "greenhouse effect" tends to ignite controversy. While the rising atmospheric concentrations of greenhouse gases-especially carbon dioxide- are certainly among the most pressing issues today, theoretical and perceived consequences have been subject to conjecture and misinformation. That raging debate has obscured an important fact: scientists and engineers are hard at work on methods to reduce CO2 emissions, and devise practical methods for their remediation. Greenhouse Gas Carbon Dioxide Mitigation: Science and Technology sheds light on the most recent advancements, documented by two of the world's leading researchers on CO2. Aware of the complexity and still-unknown factors behind climatic change, the authors consider the need to make CO2 mitigation viable for both environmental and economic gain. To that end, Professor Halmann offers new insights into interesting chemical pathways for the conversion of CO2 to useful products. Steinberg adds real-life engineering solutions, applicable to heavy CO2-producing industrial processes, and improving efficiency of energy conversion. Exciting theories and pilot projects are also testing the potential for CO2 utilization, conversion, reduction, and disposal. Greenhouse Gas Carbon Dioxide Mitigation: Science and Technology reports on the use of biomass, such as ocean fertilization and "energy farms," to put CO2 to practical and safe use. Professional and academic readers involved with CO2 research will find Greenhouse Gas Carbon Dioxide Mitigation: Science and Technology an invaluable roadmap for information and inspiration-a way to move beyond argument, and into action.
