Dissertations / Theses on the topic 'Electron energy transfer rates'
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Thorn, Penny Anne, and penny thorn@flinders edu au. "Electronic State Excitations in the Water Molecule by Collisions with Low Energy Electrons." Flinders University. Chemistry, Physics and Earth Sciences, 2008. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20080714.112505.
Full textPsalti, Ioanna S. M. "Microelectrodes : single and arrays in electron transfer." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302826.
Full textJoseph, Daphne Melissa Thow. "Energy and electron transfer in Photosystem Two." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362720.
Full textMoore, Evan Guy. "A macrocyclic scaffold for electronic energy transfer and photoinduced electron transfer /." St. Lucia, Qld, 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17983.pdf.
Full textArmitage, Bruce Alan. "Photoinduced electron transfer, energy transfer and polymerization reactions in phospholipid membranes." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186212.
Full textWilson, Graham John. "Energy transfer in gases and cryogenic liquids." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239254.
Full textCook, Shaun. "Electron transfer rates at a metal, a semiconductor and a semimetal." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2082.
Full textTobin, Peter H. "Engineering Pseudomonas aeruginosa Azurin for Energy and Electron Transfer." Thesis, Yale University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3663592.
Full textElectron transfer (EleT) and energy transfer (EngT) are common fundamental processes in life, and increasingly in materials engineering. Proteins involved in several life-critical processes including reaction centers in photosynthesis and photolyases in DNA repair have evolved protein matrixes with sophisticated temporal and spatial control of EleT and EngT. The ability to rationally design a protein matrix for EleT and/or EngT has not yet been fully realized, but would yield many benefits across bioenergetics, bioelectronics and biomedical engineering.
Pseudomonas aeruginosa azurin has been an important model system for investigating fundamental EleT in proteins. Early pioneering studies used ruthenium photosensitizers to induce EleT in azurin and this experimental data continues to be used to develop theories for EleT mediated through a protein matrix. In this dissertation it is shown that putative EleT rates in the P. aeruginosa azurin model system, measured via photoinduced methods, can also be explained by an alternate EngT mechanism. Investigation of EngT in azurin, conducted in this study, isolates and resolves confounding phenomena—i.e., zinc contamination and excited state emission—that can lead to erroneous kinetic assignments. Extensive metal analysis, in addition to electrochemical and photochemical (photoinduced transfer) measurements suggests Zn-metallated azurin contamination can result in a biexponential reaction, which can be mistaken for EleT. Namely, upon photoinduction, the observed slow phase is exclusively the contribution from Zn-metallated azurin, not EleT; whereas, the fast phase is the result of EngT between the photosensitizer and the Cu-site, rather than simple excited state decay of the phototrigger.
In order to circumvent the previously described problems with photoinduced measurements of EleT an orthogonal glassy carbon electrode based protein film voltammetry method was developed for measuring EleT rates in azurin. Finally, Computational Protein Design was utilized to modulate intramolecular EleT and EngT rates by engineering the residue composition in the core of azurin without perturbing the donor and acceptor sites.
Vancea, Anisoara. "Energy and electron transfer on titania-silica binary oxides." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12152.
Full textRostron, James P. "Electron and energy transfer in closely-spaced molecular dyads." Thesis, University of Newcastle Upon Tyne, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423720.
Full textTannert, Sebastian. "Energy and electron transfer in porphyrin-phthalocyanin-porphyrin heterotrimers." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16850.
Full textThis thesis contributes to the comprehension of energy and electron transfer within novel supra-molecular structures, denominated triads, consisting of a central phthalocyanine axially-coupled to two porphyrins. In the course of this thesis, two of the trimers, were quantitatively characterized regarding their intramolecular transfer processes. Both feature a dative bond between the porphyrins and the phthalocyanine via the central silicium atom of the latter. These investigations aimed at answering whether this class of compounds allows the desired combination of light harvesting and charge separation. The rate constants of both investigated trimers in two solvents with different polarity were determined by the combination of data from a variety of measurement methods. An efficient charge transfer from the porphyrins to the phthalocyanine and a hole transfer from the phthalocyanine to one of the porphyrins occurs in all investigated cases. This result confirms the prospect that light harvesting and charge separation can occur combined in one molecule. Depending on solvent polarity and the structure of the porphyrines, electron transfer parallel to the energy transfer and a charge back transfer takes place in addition to both above-mentioned processes. However, the charge-separated state of the investigated substances decays to fast, still preventing a practical utilization of these compounds in solar cells and necessitating further developments.
Henrich, Joseph David. "ULTRAFAST ELECTRON TRANSFER IN BIOMIMETIC SOLAR ENERGY CONVERSION ARCHITECTURES." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1284958760.
Full textSaxena, Chaitanya. "Ultrafast dynamics of energy and electron transfer in DNA-photolyase." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1171317950.
Full textDhital, Bharat. "Single-molecule interfacial electron transfer dynamics in solar energy conversion." Bowling Green State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1477997482545831.
Full textSmith, Darrin Lee. "Energy-transfer, electron-transfer, and atom/group-transfer resulting from low-energy ion-surface collisions characterize hydrocarbon, fluorocarbon, and mixed self-assembled monolayers." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/280208.
Full textBerglund, Baudin Helena. "Electron and Energy Transfer in Supramolecular Complexes Designed for Artificial Photosynthesis." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5033-4/.
Full textTipmanee, Varomyalin. "Towards a quantitative prediction of reorganisation energy for intraprotein electron transfer." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610279.
Full textSevinç, Papatya C. "Single-Molecule Interfacial Electron Transfer in Solar Energy Conversion and Bioremediation." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1367339768.
Full textZhao, Xiaohong. "Electron transfer and energy transfer in photoactive and electroactive molecules in solution and at interfaces." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/17391.
Full textJung, Younjoon 1971. "Dynamics and spectra in condensed phases : single molecule spectroscopy, electron transfer, and excitation energy transfer." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8055.
Full textVita.
Includes bibliographical references.
In this thesis, several problems regarding dynamics and spectra in condensed phases are theoretically analyzed via analytical models. The thesis consists of four main topics. First, a theoretical description of single molecule spectroscopy is presented in order to study time-dependent fluctuations of single molecule spectra in a dynamic environment. In particular, the photon counting statistics is investigated for a single molecule undergoing a generic type of spectral diffusion process. An exact analytical solution is found for this case, and various physical limits are analyzed. Second, motivated by recent experimental observations of anomalous spectral fluctuations in quantum dot systems, both the lineshape phenomenon and the photon counting statistics are explored when spectral fluctuations are characterized by power-law statistics, for which there is no finite timescale. Unique features of the power-law statistics are demonstrated in spectral properties of those systems. Third, a spectral analysis method is developed for the non-adiabatic electron transfer reactions, which allows a unified treatment of diverse kinetic regimes in the electron transfer process. The method is applied to electron transfer reactions in mixed-valence systems in order to explore the possibility of electronic coherence. Finally, effects of the nonequilibrium bath relaxation on the excitation energy transfer process are investigated by generalizing the Forster-Dexter theory of excitation energy transfer to the case of the nonstationary bath relaxation.
by YounJoon Jung.
Ph.D.
Young, Elizabeth R. (Elizabeth Renee) 1980. "Spectroscopic investigation of photo-induced proton-coupled electron transfer and Dexter energy transfer in model systems." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/49750.
Full textVita.
Includes bibliographical references.
Spectroscopic investigations of systems designed to advance the mechanistic interrogation of photo-induced proton coupled electron transfer (PCET) and proton-coupled (through-bond) energy transfer (PCEnT) are presented. PCET is ubiquitous in Nature, where it is at the heart of bioenergy conversion and catalysis (Chapter I). Systems of relevance to mechanistic studies of PCET and PCEnT are the central tenet of this work. In uni-directional PCET, electron transfer (ET) occurs from an electron donor (De) to an electron acceptor (Ae) through a hydrogen bonded proton interface. The proton interface plays a vital role in mediating ET. Thus, the exact ionization configuration of the interface must be uncovered to fuIIy realize the influence of the interface. SpecificaIIy, does the interface exists in the non-ionized (i.e. amidine-carboxylic acid) or ionized (i.e. amidinium-carboxylate) form. Strategies to spectraIIy monitor the interface ionization state by extending electronic communication from a porphyrinic chromophore to its pendant amidinium functionality are pursued through examination of an alkynylamidinium Ni(II) porphyrin (Chapter II) and an amidinium appended Zn(II) purpurin (Chapter III). With the ionization state of the interface resolved, mechanistic studies of photo-induced PCET between an identical De and Ae pair juxtaposed by a non-ionized (amidine-carboxylic acid) and an ionized (amidinium-sulfonate) interface are undertaken to reveal that PCET occurring through an ionized interface is more strongly coupled to the surrounding solvent environment (Chapter IV). Work on this system is extended to a second solvent of similar dielectric constant to establish that molecular variation of the solvent environment impacts PCET, likely through its interaction with the proton interface (Chapter V). Two water-soluble amidinium-appended ferrocene moieties are presented as building blocks for aqueous bi-directional PCET in which PT occurs to the bulk and ET occurs along a covalently bound coordinate (Chapter VI). ET and through-bond EnT are described by the semiclassical nonradiative decay formalism, meaning both processes should be sensitive to an intervening proton network. For the first time, PCEnT is established using ferrocenyl-amidine moieties bound through an amidinecarboxylic acid interface to Ru(II) polypyridyl complexes (Chapter VII).
Elizabeth R. Young.
Ph.D.
Smith, Phillip M. D'Souza Francis. "Studies on electron and energy transfer in porphyrin and fullerene based systems." Diss., Click here for available full-text of this dissertation, 2006. http://library.wichita.edu/digitallibrary/etd/2006/d004.pdf.
Full text"May 2006." Title from PDF title page (viewed on September 29, 2006). Thesis adviser: Francis D'Souza. Includes bibliographic references (leaves 147-155).
D'Aléo, Anthony. "From solution to solid state energy- and electron-transfer in complex materials /." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2006. http://dare.uva.nl/document/89463.
Full textHurley, Dennis J. "Coordination compounds as probes for energy and electron transfer in biological systems /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9987535.
Full textPerrine, Zoee Gokhale. "Modulating Energy and Electron Transfer Processes in Photosystem II of Chlamydomonas reinhardtii." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1291063978.
Full textNano, Adela. "Towards optical memories : switchable optical systems for electron and energy transfer processes." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAF011/document.
Full textThe present doctoral thesis work deals with the design, synthesis and characterization of organic and organometallic luminescent molecular frameworks for triggering Photoinduced electron Transfer (PeT) and Electronic Energy Transfer (EET) processes for applications in optical andelectronic devices. First, we turned toward the organic push-pull chromophores because they are useful model systems for studying the mechanism of PeT process. We synthesized new push-pull systems bearing a dicyanovinyl fragment as the electron-acceptor and a strong electron-donorsuch as julolidine and triazatruxene covalently linked through a BODIPY dye bridge. Electrochemical and photophysical studies showed a pronounced charge transfer character within the new push-pull systems. Furthermore, we synthesized and studied a series of chelating N^O-type ligands (Schiff base-type), based on the strong electron-donating julolidine motif, displaying ESIPT process. Their luminescence profiles exhibited panchromatic luminescence band covering the whole visible spectrum. Complexation of N^O-site with boron difluoride fragment suppressed the ESPIT process and highly increased the fluorescence quantum yield. The N^O-chelating ligands were combined with Pt(II) chromophore, B(III) and Ir(III) such as to obtainmultichromophoric frameworks. According to the photophysical studies, EET processes were observed within the multichromophoric systems. We successfully obtained a new florescent switching triad constructed around a photochromic core, [1,3]oxazine, which bears an energy-donor and an energy-acceptor module such as to directly control the EET process
Lim, Gary Lloyd Nogra. "Elucidation of Photoinduced Energy and Electron Transfer Mechanisms in Multimodular Artificial Photosynthetic Systems." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984185/.
Full textMaligaspe, Eranda. "Carbon nanostructured based donor-acceptor conjugates for light-induced energy and electron transfer." Diss., Wichita State University, 2010. http://hdl.handle.net/10057/3636.
Full textThesis (Ph.D.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Chemistry
Miyashita, Osamu. "ROLE OF CONFORMATIONAL DYNAMICS ON ELECTRON AND ENERGY TRANSFER IN A PROTEIN MOLECULE." 京都大学 (Kyoto University), 2000. http://hdl.handle.net/2433/151675.
Full textEustatiu, Iulia Gabriela. "Inner-shell electron energy loss spectroscopy and generalized oscillator strengths at high momentum transfer." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ66264.pdf.
Full textBarter, Laura Mary Claire. "Energy and electron transfer in photosystem two studied by time resolved single photon counting." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248222.
Full textShibano, Yuki. "Energy and Electron Transfer in Novel Conjugated Molecules and Their Application to Photoelectrochemical Devices." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/49146.
Full textKyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第13396号
工博第2867号
新制||工||1421(附属図書館)
25552
UT51-2007-Q797
京都大学大学院工学研究科分子工学専攻
(主査)教授 今堀 博, 教授 川﨑 昌博, 教授 榊 茂好
学位規則第4条第1項該当
Karlsson, Susanne. "Single and Accumulative Electron Transfer – Prerequisites for Artificial Photosynthesis." Doctoral thesis, Uppsala universitet, Kemisk fysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-122206.
Full textLópez, Martínez Montserrat. "Electrochemical tunneling microscopy and spectroscopy of electron transfer proteins." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/462883.
Full textLa transferencia de electrones (ET) desempeña papeles esenciales en procesos biológicos cruciales como la respiración celular y la fotosíntesis. Tiene lugar inter‐ e intra‐ proteínas redox y en complejos de proteínas que muestran una eficiencia excepcional y gran capacidad de adaptación ambiental. Aunque los aspectos fundamentales de los procesos de ET se han estudiado en profundidad, se necesitan más métodos experimentales para determinar las vías electrónicas de ET. La comprensión de cómo funciona la ET es importante no sólo por razones fundamentales, sino también por las potenciales aplicaciones tecnológicas de estos sistemas redox nanoscópicos. El objetivo general de esta tesis es investigar la transferencia de electrones en las proteínas redox a nivel de molécula individual. Para ello utilizamos la Microscopía de Túnel Electroquímico (ECSTM) y la Microscopía de Fuerza Atómica Conductor (cAFM), que son excelentes herramientas para estudiar materiales electrónicos y moléculas redox, incluyendo proteínas. En esta tesis, nos centramos en dos sistemas de proteínas redox: azurina, una pequeña proteína portadora de electrones y el fotosistema I, un complejo de proteína oxidorreductasa sensible a la luz. En el estudio de la azurina, estudiamos la conductancia de las proteínas en función de su estado redox y el efecto de parámetros técnicos como las propiedades de contacto entre la azurina y los electrodos metálicos, y la fuerza mecánica aplicada en dicho contacto. Para ello hemos adaptado nuestra configuración de ECSTM para un método de corriente alterna a menudo utilizado en Microscopía de Túnel de ultra alto vacío (UHV‐STM). También trabajamos en el desarrollo de una metodología que combina medidas de fuerza de una sola molécula basadas en AFM con medidas eléctricas, mientras trabajamos en un ambiente controlado electroquímicamente. Estas técnicas pueden conducir a una comprensión más profunda de las vías de ET y de la compleja relación entre la estructura de las proteínas redox y sus propiedades electrónicas. En el estudio del fotosistema I, desarrollamos un método para inmovilizar complejos sobre un sustrato adecuado para la obtención de imágenes y espectroscopía con ECSTM, oro atómicamente plano. En estas condiciones, caracterizamos el fotosistema I mediante imágenes y espectroscopia, y evaluamos sus propiedades de conductancia y sus parámetros de decaimiento de la corriente con la distancia, en una amplia gama de potenciales electroquímicos biológicamente relevantes. La caracterización de las vías de conducción en las proteínas redox a escala nanométrica puede permitir importantes avances en bioquímica y causar un alto impacto en el campo de la nanotecnología.
Kaganas, Gary H. "Comparing Remote Data Transfer Rates of Compact Muon Solenoid Jobs with Xrootd and Lustre." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1534.
Full textShao, Shuai. "Synthesis and Studies of Wide-Band Capturing BODIPY-Fullerene Based Donor-Acceptor Systems." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703394/.
Full textGonzalez, Aravena Arely Carolina. "Strategies to enhance extracellular electron transfer rates in wild-type cyanobacterium Synechococcus elongatus PCC7942 for photo-bioelectricity generation." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274353.
Full textKessinger, Matthew Carl. "The Influence of Inner-Sphere Reorganization on Rates of Interfacial Electron Transfer in Transition Metal-Based Redox Electrolytes." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/100128.
Full textDoctor of Philosophy
To realize next-generation renewable fuels, scientists must understand how electron transfer at an interface is controlled. This dissertation highlights one method of forming a chemically useful and long-lived charge separated state. The formation of this charge separated state is achieved through an electronic reorganization that occurs at a metal center after electron transfer. Chapters 2, 3, and 4 investigate the synthesis and characterization of new metal species that possess this electronic reorganization process and provide an advanced understanding of how this process facilitates the formation of long-lived charge separated states. This work is intended to motivate new schools of thought that aid the design of next-generation catalytic materials for light-driven chemical reactions.
Haller, Anika [Verfasser]. "Laser control and electron dynamics of ultrafast energy transfer processes in quantum dots / Anika Haller." Berlin : Freie Universität Berlin, 2019. http://d-nb.info/1195081030/34.
Full textBrown, Trevor C. "Studies in collisional energy transfer of highly rotationally and vibrationally excited molecules /." Title page, contents and abstract only, 1988. http://web4.library.adelaide.edu.au/theses/09PH/09phb881.pdf.
Full textTypescript (Processed). Errata slip inserted. Spine title: Studies in collisional energy transfer of highly excited molecules. Includes bibliographical references (leaves 143-167).
Aceta, Yara. "Optimization of the interfacial electron transfer by nanostructuring and surface modification." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S113.
Full textIt is the surface, not the bulk material that interacts with the surrounding environment; hence by altering the surface in a controlled manner we can modulate the properties of the material towards its environment. Aryldiazonium salts are suitable to tailor the surface properties since their structural diversity and their electrochemically-assisted bonding ability to modified conducting surfaces. This thesis focuses on the study of the electron transfer through different aryl layers by aryldiazonium electro-reduction at three different thickness levels, monolayer, near-monolayer, and multilayer, when the electroactive molecule is attached to the surface or in solution. Three different electrochemical methods have been used throughout this thesis, CV, EIS and SECM. The first study of this thesis focused on the investigation of the electrochemical properties of alkyl-ferrocene on-carbon monolayers in different solvents and its evaluation for improving the global charge density of carbon materials for energy storage applications. The second study used a bottom-up approach for the fabrication of well-organized surfaces. Carbon and gold substrates were modified by electro-reduction of a tetrahedral-shape preorganized aryldiazonium salt resulting in an ultrathin organic film that showed molecular sieving and current rectification properties towards redox probes in solution. The third study then focused on the oxygen reduction reaction and its intermediates, which are of general importance in natural and industrial processes. Detection of intermediates was achieved by SECM in a foot-printing strategy based on the use of different sensitive aryl multilayers. The role of the applied potential and electrolytes was investigated. Here we have demonstrated that the electrochemical properties of redox probes attached to a surface or in solution can be modulated by introducing aryl layers allowing fundamental research investigations of interest in fields such as energy storage and catalysis
Carter, Chet. "Modification of Indium-Tin Oxide Surfaces: Enhancement of Solution Electron Transfer Rates and Efficiencies of Organic Thin-Layer Devices." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195405.
Full textAhn, Tai Sang. "Determination of Vibration-to-Vibration Energy Transfer Rates of Nitrogen, Oxygen, and Hydrogen Using Stimulated Raman Scattering." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1104163814.
Full textLuo, Peng. "Transfert ultrarapide d’électron et transfert modéré d’énergie au sein d’assemblages supramoléculaires de colorants et d’un cluster de palladium." Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/9748.
Full textAbstract : Photoinduced electron and energy transfers play the pivotal role in various photochemical and photobiological redox processes including photosynthesis and respiration. Abundant covalently bonded systems have been designed to mimic the natural electron and energy transfer processes. However, the progress is often interfered by the difficulties to synthesize novel and versatile covalent donor-acceptor pairs. Recently, entities utilizing non-covalent interactions including hydrogen-bonding, [pi]-[pi] stacking, metal-ligand coordination and electrostatic interactions are becoming a hot topic since they are easy to be fabricated and tuned for selective and flexible electron and energy transfer behaviors. In this respect, the work presented in this thesis designed self-assemblies with porphyrins and a palladium cluster for photoinduced electron and energy transfers. It includes four main sections. In the first section, Chapter 3, two porphyrinic dyes, 5-(4-carboxylphenyl)-10, 15, 20-tristolyl(porphyrinato)zinc(II) (MCP, as sodium salt) and 5, 15-bis(4-carboxylphenyl)-15, 20-bistolyl(porphyrinato)zinc(II) (DCP, as sodium salt), were used as electron donors, and [Pd3(dppm)3(CO)]2+ ([Pd32+], dppm = (Ph2P)2CH2, as PF6‾ salt) cluster was adopted as the electron acceptor. The structure of [Pd32+]•••porphyrin assemblies was elucidated by geometry optimization using Density Functional Theory (DFT) calculations. Transient absorption spectroscopy (TAS) indicated a record fast electron transfer rate (< 85 fs, the time resolution limit) among the porphyrin-acceptor self-assemblies. Typically, these occur in ps-ns time scale. This rate is also comparable to the fastest electron transfer rate reported for the covalently linked porphyrin-acceptor systems (~ 50 fs, the time resolution limit). The ultrafast photo-induced electron transfers (ket > 1.2 × 1013 s-1) occurring at the S1 levels of the dyes in the structurally well-defined “straight up” ionic assemblies indicate that it is not necessary to have a strong bond and bent geometry between the donor and acceptor. In the second section, Chapter 4, we further studied the effect of using π-extended porphyrins on the electron transfer behavior of these assemblies. 9, 18, 27, 36-Tetrakis-meso-(4-carboxyphenyl)tetrabenzoporphyrinatozinc(II) (TCPBP, as a sodium salt) was selected as the candidate, and the 5, 10, 15, 20-tetrakis-meso-(4-carboxyphenyl)porphyrinatozinc(II) (TCPP, as a sodium salt) dye was also studied for comparison purposes. TCPBP and TCPP were both utilized as electron donors to fabricate supramolecular assemblies with the [Pd32+] cluster as the electron acceptor. DFT calculations were used to explain the structure of these assemblies. Under the experimental conditions used, these assemblies mainly exist in the form of one porphyrin with four equivalent clusters. These systems were also investigated by quenching measurements, electrochemistry, and other techniques. Ultrafast electron transfers (< 85 fs; time resolution limit) were also observed, which is similar as those for MCP•••[Pd32+] and [Pd32+]•••DCP•••[Pd32+] assemblies. The results indicate the structural modification from porphyrin to tetrabenzoporphyrin does not seemingly influence the kinetic behavior of the forward and back electron transfers. In the third section, Chapter 5, we synthesized a highly [pi]-conjugated porphyrin, 9, 18, 27, 36-tetra-(4-carboxyphenylethynyl)tetrabenzoporphyrinatozinc(II) (TCPEBP, as a sodium salt) by meso- and β, β-bifunctionalization, which exhibits large red shift of the Soret and Q-bands. TCPEBP was utilized as electron donors to fabricate supramolecular motifs with [Pd32+] cluster as the electron acceptor. Parallel experiments were conducted using 5, 10, 15, 20-tetra-(4-carboxyphenyl)ethynylporphyrinatozinc(II) (TCPEP, as a sodium salt). DFT and TDDFT calculations were applied to elucidate the structure of these assemblies. Binding constants for TCPEBP•••[Pd32+]x is the largest one among all the assemblies with porphyrin and palladium cluster. TAS showed again the ultrafast electron transfer process within the 75-110 fs time frame. However, the back electron transfers are also very fast (< 1 ps), which may be a potential obstacle for future applications in dye-sensitized solar cells (DSSCs). In the fourth section, Chapter 6, triplet energy transfers (TET) of the assemblies MCP•••[Pd32+] and [Pd32+]•••DCP•••[Pd32+] were studied. The transient spectral analysis in the ns-[mu]s time scale clearly demonstrates evidence for TET, which shows a slow to medium T1-T1 energy transfer (3dye*•••[Pd32+] → dye•••3[Pd32+]*) operating through a Förster mechanism exclusively with kET values of ~ 1 × 105 s-1 based on transient absorption measurements at 298 K. Unfavourable reductive and oxidative driving forces make this type of process inoperative or very slow in the T1 states. The T1 state of [Pd32+] (~8190 cm-1) has been quantitatively determined by DFT computations and by evidence for a delayed S0 ← Tn emission at 680-700 nm arising from T1-T1 annihilation, which makes this cluster potentially acting as the energy donor from its Tn state, and T1 acceptor within the assemblies. The static quenching of their near-IR phosphorescence at 785 nm was observed. This work demonstrated a moderate efficiency of the porphyrin dye to be involved in TET with an organometallic fragment, even when attached through ionic interactions. Conclusively, ionic assemblies with porphyrins and palladium clusters exhibit ultrafast S1 electron transfer and moderate T1 energy transfer properties, which is useful for possible application as optoelectronic devices. Further research in more depth is in progress.
Zieschang, Fabian [Verfasser], and Christoph [Gutachter] Lambert. "Energy and Electron Transfer Studies of Triarylamine-based Dendrimers and Cascades / Fabian Zieschang. Gutachter: Christoph Lambert." Würzburg : Universität Würzburg, 2014. http://d-nb.info/1109750072/34.
Full textWallin, Staffan. "The Fate of Electronically Excited States : Ultrafast Electron and Energy Transfer in Solvated Donor-Acceptor Systems." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis (AUU) : Universitetsbiblioteket [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6135.
Full textHenbest, K. B. "Excited state and ground state electron and energy transfer reactions of ruthenium(II) tris bipyridine complexes." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637260.
Full textYu, Yongze Yu. "Interfacial Electron Transfer in p-Type Dye-Sensitized Nickel Oxide and Machine Learning for Energy Materials." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1564756409299145.
Full textGobeze, Habtom Berhane. "Ultrafast Photoinduced Energy and Electron Transfer Studies in Closely Bound Molecular and Nanocarbon Donor-Acceptor Systems." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248516/.
Full textBose, Saumyaditya. "Bioreduction of Hematite Nanoparticles by Shewanella oneidensis MR-1." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/30189.
Full textPh. D.