Tesis sobre el tema "Acceptor Systems"
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Zheng, Meng. "Graphene based donor acceptor systems". Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3422210.
Texto completoIn questa tesi è stato condotto un metodo efficiente per esfoliare la grafite per preparare il grafene a pochi strati esfoliato (EXG). Attraverso un'adeguata centrifugazione a diversi giri al minuto (rpm), sono stati ottenuti tre tipi di scaglie di grafene esfoliate (EXG 800, EXG 1500 ed EXG 3000) con qualità diverse. Le qualità di questi fiocchi EXG erano caratterizzate dalla spettroscopia TEM, TGA e Raman. Gli spettri Raman affermano inoltre che i fiocchi EXG 3000 erano di buona qualità e possono essere altamente funzionalizzati. Ulteriori ricerche si sono concentrate sulla funzionalizzazione di EXG 3000 con donazione di carica π-center basata sul diketopirollopirrolo (DPP). Il risultante materiale ibrido di grafene presenta una buona solubilità in solventi organici e ampie caratteristiche di assorbimento della luce (500 nm - 800 nm). Il trasferimento di elettroni o di energia dai cromofori DPP ai fiocchi EXG è stato confermato dall'efficace spegnimento della fluorescenza dei cromofori DPP. I nuovi materiali ibridi sono in fase di studio come terzo componente di P3HT: miscele di eterogiunzione di massa PCBM per applicazioni fotovoltaiche organiche.
Guégano, Xavier. "Synthetic exploration of tetrathiafulvalene based donor-acceptor systems /". [S.l.] : [s.n.], 2009. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000288151.
Texto completoThomas, Michael Brandon. "Donor-Acceptor Systems: Photochemistry and Energy Harvesting Applications". Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703335/.
Texto completoMartin, P. J. P. "Electrical, magnetic and optical characterisation of donor-acceptor systems". Thesis, Cranfield University, 1991. http://dspace.lib.cranfield.ac.uk/handle/1826/10404.
Texto completoYu, Craig. "Design and Synthesis of Donor-Acceptor π-Conjugated Systems". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37930.
Texto completoDas, Sushanta Kumar. "Carbon Nanostructure Based Donor-acceptor Systems for Solar Energy Harvesting". Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc407823/.
Texto completoXu, Yunhua. "Synthesis and Photoinduced Electron Transfer of Donor-Sensitizer-Acceptor Systems". Doctoral thesis, Stockholm : Department of Organic Chemistry, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-411.
Texto completoKercher, Michael. "Ruthenium tris(bipyridine) derivatives photoactive units in supramolecular donor acceptor systems /". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966018834.
Texto completoKimura, Akihiro. "General theory of excitation energy transfer in donor-mediator-acceptor systems". American Institite of Physics, 2009. http://hdl.handle.net/2237/12630.
Texto completoStelzig, Timea [Verfasser]. "Donor–acceptor systems in the quest for organic semiconductors / Timea Stelzig". Mainz : Universitätsbibliothek Mainz, 2012. http://d-nb.info/1022300717/34.
Texto completoChristensen, Christian Ausig. "Redox active cyclophanes and donor-acceptor systems from new TTFAQ building blocks". Thesis, Durham University, 2002. http://etheses.dur.ac.uk/3880/.
Texto completoCastagnola, Norma B. "Spectroscopic studies and photochemical charge separation in Zeolite encapsulated donor-acceptor systems /". The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488190595942664.
Texto completoOchsmann, Julian Robert [Verfasser]. "Excited-state dynamics in donor-acceptor systems for energy conversion / Julian Robert Ochsmann". Mainz : Universitätsbibliothek Mainz, 2015. http://d-nb.info/1079623396/34.
Texto completoDöring, Robin Carl [Verfasser]. "Charge-transfer dynamics in molecular donor-acceptor systems and heterostructures / Robin Carl Döring". Gießen : Universitätsbibliothek, 2018. http://d-nb.info/116655855X/34.
Texto completoKC, Chandra Bikram. "Design, Synthesis and Study of Supramolecular Donor – Acceptor Systems Mimicking Natural Photosynthesis Processes". Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc822757/.
Texto completoShao, 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/.
Texto completoDöring, Robin [Verfasser]. "Charge-transfer dynamics in molecular donor-acceptor systems and heterostructures / Robin Carl Döring". Gießen : Universitätsbibliothek, 2018. http://d-nb.info/116655855X/34.
Texto completoCollini, Melissa A. "Synthesis and Studies of AzaBODIPY Derived Donor-Acceptor Systems for Light Induced Charge Separation". Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404570/.
Texto completoDuva, Giuliano [Verfasser]. "Structural and Spectroscopic Studies of Molecular Semiconductor Donor : Acceptor Systems for Organic Optoelectronics / Giuliano Duva". Tübingen : Universitätsbibliothek Tübingen, 2020. http://d-nb.info/122488227X/34.
Texto completoWebre, Whitney Ann. "Spectral, Electrochemical, Electron Transfer, and Photoelectrochemical Studies of Tetrapyrrole Derived Supramolecular Systems". Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1609091/.
Texto completoWallin, 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.
Texto completoGobeze, 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/.
Texto completoObondi, Christopher O. "High-Energy, Long-Lived Charge Separated States via Molecular Engineering of Triplet State Donor-Acceptor Systems". Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc1248463/.
Texto completoObondi, Christopher O. "High-Energy, Long-Lived Charge-Separated States via Molecular Engineering of Triplet State Donor-Acceptor Systems". Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248463/.
Texto completoKarolewski, Andreas [Verfasser] y Stephan [Akademischer Betreuer] Kümmel. "Describing Charge Transfer in Extended Donor-Acceptor Systems with Density Functional Theory / Andreas Karolewski. Betreuer: Stephan Kümmel". Bayreuth : Universität Bayreuth, 2013. http://d-nb.info/1059352494/34.
Texto completoSage, Ashley Bryan. "Donor/acceptor systems for modelling mechanisms and kinetics of hydrogen transfer reactions in relation to coal liquefaction". Thesis, Staffordshire University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309786.
Texto completoRattananakin, Pornpun. "Ab initio study of the rotation around the carbon-carbon double bond in push-pull systems". Diss., Mississippi State : Mississippi State University, 2006. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.
Texto completoFeilitzsch, Till von. "On the mechanism of photoinduced electron transfer in bridged donor-acceptor systems ferrocenophane-nileblue and rhodamine6G endcapping the DNA duplex /". [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972589198.
Texto completoLefarth, Jens [Verfasser]. "Intermolecular [2+2]-Photocycloaddition Reactions of complex Acceptor-Donor Systems and Developement of an Enantioselective Photocatalyzed Hydroformylation Reaction / Jens Lefarth". München : Verlag Dr. Hut, 2021. http://nbn-resolving.de/urn:nbn:de:101:1-2021100123325739335454.
Texto completoGALLONI, PIERLUCA. "Construction of electron-active complex systems as model for artificial photosynthesis". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2004. http://hdl.handle.net/2108/202905.
Texto completoArtificial photosynthesis is an ambitions target of modern science that obviously requires a complete understanding of natural photosynthesis. The understanding of all steps involved is one of the most important topic in chemical, biological, and physical research. The study of electron transfer reaction between donor and acceptor molecules is a crucial key point, both for development of artificial photosynthesis and for application in electronic devices and photosensible materials. The aim of this thesis was to investigate electron and energy transfer reactions, as source of information about the mechanisms that rule this complex reaction, using different donor-acceptor systems, among which attention have been focused at C60 as acceptor and ferrocene as donor. Synthetic work constituted a major task in this thesis, requiring several attempts in order to optimize reaction conditions, purification procedures and full characterization of products. A number of new compounds was obtained together with improved yields of known products. Another important aspect of the work involved investigation of donor-acceptor interaction in some of the dyads, both in ground and in excited states. Among all the results, the most significant ones may be summarized in the following points. a) A peculiar behaviour emerged from photophysical and computational experiments, electronic spectra and electrochemical measurements of fluorene-fullerene dyads. Different interaction was the result of changing the position through which the two moieties are connected. b) Very interesting results emerged when a frozen structure was obtained from connecting ferrocene and fullerene moieties in a rigid assembly. In fact, in comparison with a dyad with flexible connection, a faster electron transfer rate - and therefore an enhanced interaction - was observed in the excited state. c) Efficient energy transfer was observed with supramolecular (ZnSalen)-(N-methyl-2-pyridyl-[3,4]fulleropyrrolidine) dyads. This system can be used as a good model for light harvesting model. d) Very efficient electron transfer reaction occurred between zinctetraferrocenylporphyrin and pyridylfulleropyrrolidine in supramolecular (ZnFc4Porph)-(N-methyl-2-pyridyl-[3,4]-fulleropyrrolidine) dyad, as observed by transient spectroscopy, even in non polar solvent such as toluene. In conclusion, new good systems for energy an electron transfer were obtained and investigated by different approaches. They can be used to reach a deeper knowledge of complex phenomena that rule natural photosynthesis as well as to build photosensible devices.
Alves, Jessica. "Advanced photochemical reaction systems for molecular design". Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/227734/1/Jessica_Alves_Thesis.pdf.
Texto completoBrowning, Charles. "Diimine(dithiolate)platinum(ii) Chromophores: Synthesis, Spectroscopy, and Material Applications". Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699877/.
Texto completoKaiser, Conrad [Verfasser], Christoph [Gutachter] Lambert y Ingo [Gutachter] Fischer. "Donor-Bridge-Acceptor Systems with Varying Bridge Units for the Investigation of Intramolecular and Intermolecular Electron Transfer Processes / Conrad Kaiser. Gutachter: Christoph Lambert ; Ingo Fischer". Würzburg : Universität Würzburg, 2014. http://d-nb.info/1102825794/34.
Texto completoMaibach, Julia [Verfasser], Wolfram [Akademischer Betreuer] Jaegermann y Heinz von [Akademischer Betreuer] Seggern. "Preparation and Characterization of Solution Processed Organic Semiconductor Interfaces: Electronic Properties of Thiophene-Fullerene based Donor-Acceptor Systems / Julia Maibach. Betreuer: Wolfram Jaegermann ; Heinz von Seggern". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2014. http://d-nb.info/1110901321/34.
Texto completoGupta, Gaurav Kumar [Verfasser], Thomas [Akademischer Betreuer] Thurn-Albrecht, Christine M. [Akademischer Betreuer] Papadakis y Wolfgang [Akademischer Betreuer] Paul. "Structural investigations on semiconducting donor-acceptor block copolymers and related model systems for organic photovoltaics / Gaurav Kumar Gupta. Betreuer: Thomas Thurn-Albrecht ; Christine M. Papadakis ; Wolfgang Paul". Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1052221262/34.
Texto completoNicoletta, Francesca. "Design and synthesis of new processable materials for application in organic devices". Doctoral thesis, Università di Catania, 2017. http://hdl.handle.net/10761/3977.
Texto completoLinton, Katharine Elizabeth. "New bipolar organic materials for optoelectronic applications". Thesis, Durham University, 2012. http://etheses.dur.ac.uk/4437/.
Texto completoMarushchak, Denys. "Fluorescence studies of complex systems : organisation of biomolecules". Doctoral thesis, Umeå : Department of Chemistry, Umeå University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-979.
Texto completoBusseau, Antoine. "Synthèse et caractérisations de nouveaux penta(organo)[60]fullerènes pour la formation d’assemblages supramoléculaires". Thesis, Angers, 2017. http://www.theses.fr/2017ANGE0033/document.
Texto completoThe unique structure and properties of fullerenes have attracted wide interest especially in electronic and optoelectronic fields. In this context, a variety of mono-and poly-fullerene adducts have been described for theirs interest in the development of new complex materials and supramolecular polymers. Here, we present the synthesis and studies of new donor-acceptor supramolecular polymers based on penta(organo)[60]fullerenes. The perfect regioselectivity of the [60]fullerene pentafunctionalization reaction has provided us a singular conical structure formed by five ethynylaryl fragments. To this structure different electro and/or photoactive fragments (tetrathiafulvalene or zinc-porphyrin) were covalently linked using five simultaneous 1,3-dipolar cycloaddition reactions. The formed host-cavity together with the donor-acceptor properties of these system allow their assembly by supramolecular interactions. We have realized the synthesis of these penta(organo)[60]fullerenes as new donor-acceptor materials and the studies of their remarkable supramolecular arrangement in solution and solid state
Vilmercati, Paolo. "Ultra-fast charge transfer dynamic in thin and ultra-thin films of organics studied with synchrotron radiation". Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2564.
Texto completoThe increasing energy crisis has induced science and technology world to drive a lot of efforts in the study of new materials suitable to develop renewable and with a low environmental impact energy sources as an alternative to petroleum. In this context photo-voltaic cells are a good solution, nevertheless the high costs and the low light-to-current efficiency still inhibits a large production and a common usage. The employment of organic based materials, i.e. the materials inspired by biological processes, finds a place in this research field. The wide availability of these materials in nature, the ease in material processing and the intriguing chemical and physical properties places the organics as good candidates in the production of photovoltaic devices. Moreover, their electronic properties allow a usage as charge injector to enhance the light-to-current efficiency in inorganic-based photovoltaic devices (Gratzel-cells). The aim of this thesis is to study the growth, the electronic properties, and the chargetransfer dynamic in thin and ultra-thin film(single molecular layer) composed by zinc-tetraphenylporphyrin and C70 and thicker melanin films. We choose these molecules both because of their high visible light sensitivity and because porphyrins are electron donor and fullerenes are electron acceptors. In fact, it is well know in biology that the chlorophyll (Mg-poprhyrin) when illuminated with visible light, act as an electron injector in the biochemical environment supplying the amount of energy needed to activate the production of glucose starting from water and carbon dioxide (chlorophyll synthesis). The fullerene C70 consist in an arrangement of 70 carbon atoms in a closed cage structure and is a good electron acceptor. Then, the our purpose is to use the different electronic properties of these molecules to generate donor/acceptor junctions at the molecular scale. Melanin is a natural pigment present in living beings responsible, in human body, of the colour of skin and of its variation due to the exposition to the sun light; it is a semiconductor with electron donor properties. The combined usage of the properties of these molecules opens the way to the production of complexes to realize high-efficiency and low cost photovoltaic devices. In this context, and at the present state of the art in the production of organic-based photovoltaic devices, investigations about the basic mechanism of molecular interaction and electronic properties are needed to clarify the problems that are still open. In fact the light-tocurrent conversion is just one of the possible processes successive to the absorption of a visible photon in a material. In fact the large number of dissipative processes dissipates the charges excited by the light and inhibits the light-to-current conversion efficiency. In this context, two aspect are fundamental: the presence of empty states in the conduction band that are not allowed for dipole transitions from the valence band but energetically favourable with respect to the first allowed ones, in order to brake the excitonic bond and a good charge mobility in order to transport the excited charges up to the collecting electrodes of the device. because the mobility is higher in ordered systems instead of non ordered ones, the molecular interaction and the growth condition have a fundamental role because they determine the molecular packing in the film. In this sense we used soft X-rays and UV-rays photoemission to study the interaction between ZnTPP and C70 and between these molecules and the Si(111)7x7 surface, one of the most common substrate used to produce electronic devices. We studied the order in the various films in the sense of “orientational order” using Near Edge Absorption Fine structure Spectroscopy at SuperESCA and ALOISA beamlines at ELETTRA synchrotron radiation facility in Trieste. Because the NEXAFS spectra, obtained with linearly polarized radiation, are sensitive to the direction of the chemical bonds, the dependence of the absorption structures intensity on the angle between the electrical field of the incoming radiation and the direction of the empty states yields informations about the geometrical (orientational) arrangements of the molecules in the film. The films were produced by sublimation in ultra-high-vacuum in order to obtain a film as pure as possible. We produced a melanin film via “drop casting”, by in air deposition of a suspension of synthetic melanin powder in mineral free water on a polycristal copper surface and drying the water. We obtained the first photoemission data available in literature about this system. A particular attention was dedicated to the ultra-fast delocalization processes of the excited charges. We used Resonant Photoemission technique (SuperESCA beamline at ELETTRA) to study the excitation de-excitation processes: a core electron is pumped to an empty state in the conduction band, the following decay of the core hole (scale of fs) reveals time scale of the excited charge delocalization with a chemical sensitivity typical of core spectroscopies
La crescente crisi energetica ha indotto la scienza e la tecnologia ad indirizzarsi verso lo studio di nuovi materiali da utilizzarsi per sviluppare fonti di energia alternative al petrolio che siano rinnovabili e a basso impatto ambientale. In questo ambito le celle foto-voltaiche sono una buona risposta, tuttavia i costi elevati e la bassa efficienza nella conversione luce-corrente fanno sì che esse non siano ancora di uso comune. Lo studio dei materiali organici, ovvero di quelli ispirati da processi biologici, trova spazio in questo ambito di ricerca. La larga diffusione in natura dei costituenti, la facilità nel processare il materiale, e le interessanti proprietà chimico-fisiche fanno dei materiali organici una delle possibili scelte nella realizzazione di dispositivi fotovoltaici. Inoltre, la versatilità di questi materiali li rende utilizzabili anche come iniettori di cariche per aumentare l’efficienza di conversione luce-corrente se accoppiati con semiconduttori inorganici (Gratzel-cells). Oggetto di questa tesi è lo studio della crescita e delle proprietà elettroniche di trasferimento di carica di film sottili e monostrati molecolari composti di zinco-tetrafenil-porfirina e C70, e film di melanina. La scelta di queste molecole origina sia dalle loro proprietà di sensibilità alla luce visibile che dalle loro proprietà elettroniche di essere donori ed accettori di elettroni. Infatti, è ben noto in natura che la clorofilla (magnesio-porfirina) svolge la funzione di iniettore di carica nell’ambiente biochimico per fornire l’energia necessaria all’attivazione della produzione di glucosio a partire da acqua e anidride carbonica, quando esposta a luce solare. Il fullerene C70 è una molecola costituita da settanta atomi di carbonio disposti in una struttura chiusa a gabbia ed ha la proprietà di essere un accettare di elettroni. Uno degli obiettivi è, quindi sfruttare le diverse proprietà elettroniche di queste molecole per realizzare delle giunzioni donore/accettore su scala molecolare. La melanina è il pigmento naturale presente negli esseri viventi responsabile, nel corpo umano, del colore della pelle e del suo cambiamento in seguito all’esposizione alla luce ed è anch’essa un semiconduttore con proprietà di donore di elettroni. L’uso combinato di queste caratteristiche apre la strada alla realizzazione di materiali complessi che possano essere utilizzati nella realizzazione di dispositivi fotovoltaici. In questo contesto, e all’attuale stato dell’arte della realizzazione di dispositivi fotovoltaici basati su molecole organiche è necessario lo studio di base delle proprietà elettroniche dei film composti di queste molecole per affrontare problematiche aperte. Infatti il processo di conversione della luce in corrente è solo uno di quelli possibili in seguito all’assorbimento di un fotone visibile da parte di un materiale. Infatti un gran numero di processi dissipativi rende le cariche eccitate in gran parte inutilizzabili ai fini della conversione della luce in corrente. Due aspetti sono fondamentali affinché il materiale possa essere efficiente nella conversione luce-corrente: la presenza di stati di conduzione vuoti non accessibili tramite eccitazione con radiazione elettromagnetica ma energeticamente favorevoli rispetto a quelli accessibili, e una buona mobilità delle cariche eccitate in modo da essere trasportate senza dissipazione verso gli elettrodi di raccolta. Dal momento che la mobilità delle cariche è maggiore in sistemi ordinati, diventano cruciali sia le tecniche di crescita che le interazioni molecolari che determinano l’impacchettamento delle molecole a formare il film. In questo senso ci siamo avvalsi della spettroscopia di fotoemissione nel regime dei raggi X soffici e di raggi UV per studiare sia l’interazione tra le due specie molecolari e substrato (superficie (111) del silicio) che tra porfirina e porfirina e porfirina e fullerene, crescendo films a spessori via via crescenti. Per quanto riguarda la crescita, e quindi l’ordine con cui sono stati cresciuti i films abbiamo utilizzato la spettroscopia di assorbimento vicino soglia (NEXAFS, esperimenti eseguiti sulla beamline ALOISA ad ELETTRA). Poiché gli spettri di assorbimento sono sensibili alla direzione di legami chimici qualora eccitati con radiazione polarizzata linearmente, la dipendenza dell’intensità dei singoli picchi di assorbimento dall’angolo tra il vettore campo elettrico della radiazione e la direzione del legame fornisce informazioni circa la geometria del sistema. I films sono stati ottenuti per sublimazione di polveri in ultra alto vuoto al fine di ottenere un sistema chimicamente puro. Per quanto riguarda la melanina, abbiamo realizzato un film utilizzando la tecnica del “drop casting” depositando una sospensione di acqua e melanina su una superficie di rame policristallino e lasciando evaporare l’acqua. Sono stati raccolti, quindi, i primi dati di fotoemissione presenti in letteratura riguardo questo sistema. Particolare attenzione è stata rivolta ai processi ultraveloci di delocalizzazione delle cariche in stati eccitati. A tale scopo abbiamo utilizzato la tecnica di fotoemissione risonante (ResPES, esperimenti eseguiti sulla beamline SuperESCA ad ELETTRA), in cui un elettrone di core viene eccitato da radiazione di sincrotrone a riempire uno stato di conduzione, il successivo decadimento della buca di core (scala temporale dei fs) permette di individuare l’avvenuta delocalizzazione dell’elettrone eccitato ed ottenere una stima dell’efficienza di trasferimento di carica con specificità chimica
XX Ciclo
1973
Pokethitiyook, Prayad. "Nitrate utilization as the final electron acceptor in a biological phosphorus removal system". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03122009-040836/.
Texto completoSong, Baiyun. "Studies on High Potential Porphyrin-fullerene Supramolecular Dyads". Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc407825/.
Texto completoVartanian, Maida. "Cu(I) catalyzed alkyne-azide cycloaddition as a synthetic tool for the preparation of complex C60 derivatives". Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAF016.
Texto completoThe present PhD thesis manuscript is focused on the use of fullerene building blocks for the preparation of photoactive molecular devices combining C60 and porphyrins. Cu(I) Catalyzed alkyne-azide cycloaddition was used as a synthetic tool for the preparation of complex C60 derivatives. Specifically, in the first part (Chapter II-B), a flexible fullerene-porphyrin triad has been developed and the photophysical studies were performed. The flexible linker between the fullerene core and the azide groups prevented any conformational control on the relative orientation and distance between the two photoactive subunits connected together. This prompted the development of an analogous building block in which the azide unit is directly connected to the bridging phenyl ring (Chapter II-C). In this way, the click reaction with porphyrin-alkyne derivatives give access to hybrid systems with a controlled relative orientation of the two moieties. This is of fundamental importance for a better understanding of the structural parameters affecting the electron and/or energy transfer kinetic in such dyads.In the second part (Chapter III), a fullerene hexaadduct scaffold is used to build up sophisticated multiporphyrin systems for various applications. The preparation of these multi-chromophoric ensembles relies on the click-click approach developed in our group
Manda, Venkata Ramana. "Enhancing the Photovoltaic Performance of P3HT/PDIB Silsesquioxane Donor-Acceptor System Using Spray Deposition Fabrication Technique". TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1336.
Texto completoPelchen-Matthews, A. "Distribution of functional acceptors for dendrotoxin and B-bungarotoxin in the central nervous system". Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47216.
Texto completoGunes, Arzu. "Synthesis Of A Novel Series Of Furan And Fluorene Containing Monomers And Their Polymers". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613768/index.pdf.
Texto completo2,7-di(furan-2-yl)-9H-fluoren-9-one (FOF), 2-(2-(furan-2-yl)-9H-fluoren-7-yl)furan (FFF), and 2-(2-(furan-2-yl)-9,9-dihexyl-9H-fluoren-7-yl)furan (FHF) were synthesized and their electrochemical polymerization were achieved via potential cycling. Optical and electrochemical properties of the polymers, poly(2,7-di(furan-2-yl)-9H-fluoren-9-one) (PFOF), poly(2-(2-(furan-2-yl)-9H-fluoren-7-yl)furan (PFFF) and poly(2-(2-(furan-2-yl)-9,9-dihexyl-9H-fluoren-7-yl)furan) (PFHF) were investigated and it was found that polymer films exhibit reversible redox behavior (Epox = 1.083 V for PFOF, Epox= 0.915 V for PFFF and Epox= 0.985 V for PFHF) accompanied with a reversible electrochromic behavior, orange to green for PFOF, yellow to dark blue for PFFF and orange to green for PFHF during oxidation. Their band gap values (Eg) were found to be 2.32, 2.49 and 2.61 eV for PFOF, PFFF and PFHF, respectively.
Dirksen, Elena [Verfasser], Thomas J. J. [Gutachter] Müller y Klaus [Gutachter] Schaper. "Synthese neuartiger Acceptor-substituierter Phenothiazine als Systeme für photoinduzierten intramolekularen Elektronentransfer / Elena Dirksen ; Gutachter: Thomas J. J. Müller, Klaus Schaper". Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2019. http://d-nb.info/1189901714/34.
Texto completoKneeshaw, Tara Ann. "Evaluation of kinetic controls on sulfate reduction in a contaminated wetland-aquifer system". [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2972.
Texto completoHanson, Christina J. "Building model systems to understand Proton-Coupled Electron Transfer in heme : spectroscopic investigation of charge transfer to axially bound diimide acceptors". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79268.
Texto completo"February 2013." Vita. Cataloged from PDF version of thesis.
Includes bibliographical references.
Proton-Coupled Electron Transfer (PCET) is an important mechanistic motif in chemistry, which allows for efficient charge transport in many biological systems. We seek to understand how the proton and electron motions are coupled in a bidirectional system allowing for individual turning of the kinetics and thermodynamics. The target of interest is a biomimedic heme system allowing for a detailed mechanistic study of the formation of the oxidation states of heme, of particular interest the highly reactive Fe(IV)=O species. The bidirectional model is prepared using a hangman porphyrin with an axially coordinated to the metal center, and the electron transfer event is triggered by excitation of the porphyrin. The synthesis of this motif is discussed as well as initial studies into the binding of a coordinated electron acceptor to the metal center. In the future, the excited state of the acceptor will be used to trigger the electron transfer portion of the PCET event. To understand the signatures of different electron acceptors and binding to the metal center, a redox inactive zinc porphyrin is used as a model to allow for longer excited state lifetimes and well known transient signatures. Three diimide acceptors have been coordinated through a pyridine ring to the metal center of the porphyrin, and electron transfer was triggered both by excitation of the porphyrin and the acceptor. Lifetimes of the charge separated state were determined using picoseconds and nanosecond transient absorption. The acceptors are then coordinated to a symmetrical iron porphyrin in an attempt to understand the behavior of charge separation in the more complicated open d shell system. Spectroscopic data of both systems is shown.
by Christina J. Hanson.
S.M.in Inorganic Chemistry
Quinton, Cassandre. "Dérivés de s-tétrazine et de triphénylamine : du design aux applications". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00957915.
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