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Dissertations / Theses on the topic 'Cationes radicales'

Author: Grafiati

Published: 17 September 2021

Last updated: 30 July 2025

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1

Kildahl-Andersen, Geir. "Polyenyl cations and radical cations – synthesis, spectroscopic properties and reactions." Doctoral thesis, Norwegian University of Science and Technology, Department of Chemistry, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1790.

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<p>In the present work, polyene precursors for the formation of charged polyenyl species were synthesised. Their conversion to charge delocalised radical cations and diamagnetic mono- and dications was carried out by treatment with Brønsted and Lewis acids. Reaction conditions were optimised to achieve sufficient stability of the charged polyenes for characterisation by modern spectroscopic methods; in particular nearinfrared absorption spectroscopy (NIR), two-dimensional nuclear magnetic resonance (2D NMR), electron paramagnetic resonance (EPR) and dynamic light scattering.</p><p>The full ass

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2

Rideout, Jan. "Selected radical cations : an E.S.R. study." Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/33870.

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This thesis is concerned with a process which has become commonly used. Producing radical cations specifically for observation at reduced temperatures within the X-band electron spin resonance spectrometer cavity. Gamma irradiation is used to cause electron addition and electron loss centres in a CCl3F matrix. These damage centres can be passed to solutes by the processes outlined below:- [equation] Various functional groups have been investigated. A variety of groups have been chosen to attempt to show a great many of the effects, which cause a molecule to produce interesting e.s.r. spectra.

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3

Wang, Yonghui. "The Chemistry of Cyclopropylarene Radical Cations." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29818.

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Cyclopropane derivatives are frequently utilized as "probes" for radical cation intermediates in a number of important chemical and biochemical oxidation. The implicit assumption in such studies is that if a radical cation is produced, it will undergo ring opening. Through a detailed examination of follow-up chemistry of electrochemically and chemically generated cyclopropylarene radical cations, we have shown that the assumption made in the use of these substrates as SET probes is not necessarily valid. While cyclopropylbenzene radical cation undergoes rapid m

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4

White, Ryan Coleman Forbes Malcolm D. E. "Characterization of amino acid and peptide radicals and radical cations and their use as probes for the aqueous microenvironment." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,597.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.<br>Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements of the degree of Doctor of Philosophy in the Department of Chemistry." Discipline: Chemistry; Department/School: Chemistry.

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5

Robin, Dorothée. "Réactions unimoléculaires des cations ou cations radicaux hétérocycliques et oxygénés en phase gazeuse." Paris 11, 1986. http://www.theses.fr/1986PA112306.

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Ce travail porte sur les mécanismes d’isomérisation et de fragmentation des cations et cations radicaux d’hétérocycles saturés et insaturés en phase gazeuse. Un bref exposé des généralités sur la spectrométrie de masse et sur les mécanismes d’isomérisation des carbocations précède la première partie de ce travail où sont comparés les comportements des ions [M-H]+ provenant des cycles et d’hétérocycles aromatiques. Le comportement des ions alkylfurannes et alkylbenzofurannes protonés est étudiés dans une deuxième partie ainsi que celui d’ions adduits isomères ; Cette étude rend compte de l’exis

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6

Ng, Chun-ming Dominic, and 伍俊明. "Formation, isomerization and dissociation of radical cationicpeptides." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47145663.

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A fundamental understanding of the isomerization and fragmentation of peptide ions forms the scientific basis underlying peptide sequencing in the gas phase—an important emerging analytical technique routinely used in proteomics applications. Gas phase dissociation of odd-electron radical peptide cations (M?+) provides an alternative and complementary analytical method for identifying peptide sequences; this fragmentation behavior is distinct from that of even-electron protonated peptides ([M+H]+). Despite recent experimental and theoretical advances in studies of radical cationic peptides, t

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7

Xu, Minjie, and 许敏洁. "Dissociation and characterization of cationic radical peptides." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/197123.

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Gas phase fragmentations of cationic radical peptides provide important fundamental information that forms the basis for peptide sequencing by using mass spectrometry. Presenting results from low-energy collision-induced dissociation (CID) experiments and theoretical density functional theory (DFT) calculations in conjunction with Rice–Ramsperger–Kassel–Marcus modeling, this thesis describes some of the chemical properties, including the locations of the charge and radical sites that determine the gas-phase chemistry of peptide radical cations. The first Section (3.1) documents the dissocia

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8

Lam, Ngor-wai. "Generation and characterization of cationic and anionic radical peptides." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37097672.

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9

Schlientz, Nathan William. "Charge Migration through Duplex DNA: A Study of the Mechanism for Charge Migration and Oxidative Damage." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-05182006-164757/.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2007.<br>Laren M. Tolbert, Committee Member ; Uzi Landman, Committee Member ; Nicholas V. Hud, Committee Member ; David M. Collard, Committee Member ; Gary B. Schuster, Committee Chair.

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10

Jung, Woncheol. "Ring opening of tetraaryl thiirane cation radicals." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186684.

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Ring opening of tetraaryl thiirane cation radical was studied. The cation radical of tetraaryl thiirane generated photochemically undergoes C-C bond cleavage driven by inherent ring strain. This ring cleavage occurs in a stereospecific conrotatory manner at low temperature. However, this stereospecificity is lost when the reaction is conducted at room temperature. In this photoreaction between tetraaryl thiirane and tetracyanoethylene, (3+2) cycloadducts are obtained as a result of electron transfer, ring opening, back electron transfer, and 1,3-dipolar cycloaddition. A CIDNP experiment and γ-

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11

Lam, Ngor-wai, and 林我威. "Generation and characterization of cationic and anionic radical peptides." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37097672.

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12

Morris, C. R. "An ESR and ENDOR study of heterocyclic radical cations." Thesis, University College London (University of London), 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484304.

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13

Roan, Graeme A. "Cobalt-mediated radical and cationic cyclisation reactions." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336865.

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14

Gao, Shuang [Verfasser], Meike [Akademischer Betreuer] Niggemann, and Markus [Akademischer Betreuer] Albrecht. "Study of reactive intermediates: vinyl cations and aminium radical cations / Shuang Gao ; Meike Niggemann, Markus Albrecht." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1181109159/34.

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15

Popp, Ann E. "Investigation of the lifetimes of electrochemically generated anthracene cation radicals in the presence of selected nucleophiles." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/27173.

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16

Burke, Marc. "Pulsed radiation studies of carotenoid radicals and excited states." Thesis, Keele University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.482117.

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17

Warren, C. J. "Kinetic and spectroscopic studies of radical-cations in aqueous solution." Thesis, University of York, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379026.

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18

Pan, Duohai. "Nanosecond time-resolved resonance Raman and ab initio studies of triplet states and radical cations of halobiphenyls and the radical cations of phenothiazine, promazine, and chloropromazine /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22237665.

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19

Hogan, Colin Charles. "The formation and properties of cation radicals from hydroquinone ethers." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316592.

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20

Iwasaki, Takeshi. "Free radical and cationic polymerizations using micro flow systems." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136263.

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21

Sanii, Laurie Shireen. "The effect of terminal base identity on radical cation injection into the DNA duplex." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/29377.

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22

Zhang, Yaming. "Electron spin resonance studies of organic radical cations : theoretical and experimental approach." Thesis, Liverpool John Moores University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313090.

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23

Lorance, Edward Donald. "Synthetic and computational studies on organosulfur radical cations and alpha-metalated sulfides." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/284212.

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The oxidation potentials and electrooxidation mechanism of 3,6-di substituted-1,2-dichalcogenins was investigated by cyclic voltammetry. An EC mechanism was found experimentally and the basis for the chemical step was found computationally to be a change in the planarity of the ring on electron transfer. Photoelectron spectra were obtained of 3,6-disubstituted-1,2-dichalcogenins a different ionizing photon energies. The interpretation of the photoelectron spectra was assisted by computational simulation. A narrow ionization band was found, and was assigned as the sulfur-sulfur σ orbital by com

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24

Jaunbergs, Janis. "AROMATIC RADICAL CATION COUPLING IN BIOMIMETIC ALKALOID SYNTHESIS." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1024673469.

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25

Krishnamoorthy, Mahentha. "Developing cationic nanoparticles for gene delivery." Thesis, Queen Mary, University of London, 2016. http://qmro.qmul.ac.uk/xmlui/handle/123456789/23193.

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Gene delivery can potentially treat acquired and genetic diseases such as cystic fibrosis, haemophilia and cancer. Non-viral gene delivery vectors are attractive candidates over viral vectors such as recombinant viruses, due to their lower cytotoxicity and immunogenicity, despite significantly lower transfection efficiencies. To improve efficiency of non-viral vectors, the investigation of the various parameters influencing DNA transfection is essential. The present study developed a versatile gene delivery system with tailored physicochemical and biological properties. The system used polymer

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26

Norberg, Daniel. "Quantum Chemical Studies of Radical Cation Rearrangement, Radical Carbonylation, and Homolytic Substitution Reactions." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8178.

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27

Frank, Aaron J. "Small, oxygenated sulfur compounds : a neutralization-reionization mass spectrometry, ab initio/RRKM, and flowing pyrolysis study /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/11610.

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28

Trikoupis, Moschoula Anna. "A mass spectrometric and computational study of hydrogen transfer reactions in radical cations /." *McMaster only, 2001.

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29

Rosseinsky, Matthew Jonathan. "Physical properties of superconducting oxides and radical cation salts." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258032.

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30

Fortenberry, Ryan Clifton. "Theoretical Prediction of Electronically Excited States and Vibrational Frequencies of Interstellar and Planetary Radicals, Anions, and Cations." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/26329.

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In the search for molecular species in the interstellar medium and extraterrestrial planetary atmospheres, theoretical methods continue to be an invaluable tool to astronomically minded chemists. Using state-of-the art methods, this doctoral work characterizes the electronically excited states of interstellar radicals, cations, and even rare anions and also predicts the gas phase fundamental vibrational frequencies of the cis and trans-HOCO radicals, as well as the cis-HOCO anion. First, open-shell coupled cluster methods of singles and doubles (CCSD) and singles and doubles with triples-inclu

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31

Das, Prolay. "Long-Range Charge Transfer in Plasmid DNA Condensates and DNA-Directed Assembly of Conducting Polymers." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19856.

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Long-distance radical cation transport was studied in DNA condensates where linearized pUC19 plasmid was ligated to an oligomer and transformed into DNA condensates with spermidine. DNA condensates were detected by Dynamic Light Scattering and observed by Transmission Electron Microscopy. Introduction of charge into the condensates causes long-distance charge migration, which is detected by reaction at the remote guanines. The efficiency of charge migration in the condensate is significantly less than it is for the corresponding oligomer in solution. This result is attributed to a lower mobili

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32

Portwood, Lynn. "Spectroscopic studies of coal and an ESR study of mono and dicarbonyl radical cations." Thesis, University of Leicester, 1987. http://hdl.handle.net/2381/27840.

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Part I - ESR spectra of pure coals, oils and tars are presented; their g values and linewidths are calculated. Almost all the spectra are single, broad resonances; but one coal, Hucknall Coal, exhibits a two line spectrum, a narrow line superimposed on a broad line. On admission of oxygen the narrow line is reversibly lost. On the addition of various solvents to the samples, in most cases, an irreversible loss in ESR signal intensity was observed. There seems to be no direct correlation between which solvent is added to which coal and the effect on the ESR signal intensity. Infra-red spectra o

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33

Laricheva, Elena N. "Turning on Fluorescence in Silico: From Radical Cations to 11-cis Locked Rhodopsin Analogues." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339787341.

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34

Berry, Bruce W. "Using de novo design proteins to explore tyrosine radicals and cation-π interactions". Doctoral thesis, Stockholms universitet, Institutionen för biokemi och biofysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-102008.

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Redox cofactors and amino-acid free radicals play important roles in biology. Although many of the same cofactors and amino acids that form these radicals are found across a broad range of biological systems, identical cofactors can have different reduction potentials. The local environment plays a role in defining these redox potentials. An understanding of this local-environment effect can shed more light on how redox chemistry works in nature. Our laboratory has developed a library of model proteins that are well suited to study amino-acid radicals. a3X is a de novo designed protein that is

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35

Hernandez-Alvarado, Edgardo Manuel. "Synthesis Of Porphyrin Containing Molecular Dyads For Radical-Cation Generation." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/338955.

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The overall efficiency of photovoltaics is dictated by processes occurring within it. These processes include exciton formation, diffusion, dissociation and charge collection. This dissertation will focus around the fundamental issue of charge collection. In organic photovoltaics (OPVs) the rate of charge injection is dominated by the interaction between dissimilar materials, usually organic compound interacting with inorganic ones. In order to improve this rate of injection and, by direct consequence the efficiency of this process, fundamental knowledge of this organic-inorganic interface mus

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36

LE, BLANC ALAIN. "Reactions unimoleculaires en phase gazeuse, de radicaux cations bifonctionnels : beta ceto-alcool, beta ceto-esters et de cations beta ceto-acylium." Paris 6, 1988. http://www.theses.fr/1988PA066349.

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Une introduction generale sur la spectrometrie de masse precede une premiere partie portant sur l'interpretation des fragmentations de la dimethyl-3,3 hydroxy-4 butanone-2 a basse energie. Une seconde partie est reservee aux fragmentations de plusieurs beta ceto-esters diversement substitues. Dans une troisieme partie sont examinees les decompositions unimoleculaires d'ions acylium beta carbonyles de faible energie interne. L'accent est mis, tout au long de ce travail, sur le role essentiel des atomes d'oxygene dont la presence induit des ruptures caracteristiques mais aussi sert de relais aux

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37

Heydorn, Lisa Natasha Terlouw Johan K. "Spontaneous and catalyzed hydrogen shifts in radical cations having a phosphoryl or carbonyl group : a tandem mass spectrometry and CBS-QB3 computational study /." *McMaster only, 2003.

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38

Lee, Cheong-wan. "Time-resolved resonance Raman and density functional theory investigation of the T1 triplet states and radical cations of substituted biphenyl compounds." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22956311.

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39

Anamimoghadam, Ommid. "9-C-substituted phenalenones as promising precursors for the synthesis of novel stable phenalenyl-type cations and radicals." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4433/.

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Previous research in the Bucher group led to the generation of a novel phenalenyl derived radical, naphtho[2,1,8-mna]xanthenyl (NX). Through the photolysis of 9-phenyl-1H-phenalen-1-one (9-phenyl-PN), a transient 5aH-naphtho[2,1,8-mna]xanthene with a very weak C(sp3)-H bond was formed and could undergo hydrogen abstraction in the presence of an electron acceptor such as tetracyanoethylene (TCNE) or benzoquinone (BQ). As a result, NX was formed which exhibited a long persistence based on electronic stabilisation (Scheme A). This thesis deals with the practical preparation of potential precursor

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40

Kermarrec, Maxime. "Simulations multi-échelles de l'ADN nucléosomal : cartographie du cation radical guanine." Electronic Thesis or Diss., Lyon, École normale supérieure, 2024. http://www.theses.fr/2024ENSL0091.

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La particule de coeur du nucléosome (NCP) est un système complexe découvert dans les années 70 et qui n'a jamais cessé d'être étudié depuis. Elle est composée d’un brin d’ADN de 146-147 paires de bases enroulé autour d’un cœur protéique de 8 histones. Cette structure permet la compaction de l’ADN au sein de la chromatine. Principalement en raison de ses variantes de structure et de ses modifications post-traductionnelles, elle joue un rôle important dans différents processus biologiques tels que le la transcription génique, la réponse aux dommages de l'ADN ou encore la ségrégation des chromoso

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41

李昌運 and Cheong-wan Lee. "Time-resolved resonance Raman and density functional theory investigation of the T1 triplet states and radical cations ofsubstituted biphenyl compounds." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224623.

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42

Chiu, Ching-Wen. "Synthesis, characterization, anion complexation and electrochemistry of cationic Lewis acids." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2672.

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43

Cihaner, Atilla. "Electrochemical Synthesis Of Crowned Conducting Polymers: Nature Of Radical Cations In Polymerization And Mechanism Of Conductivity." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605054/index.pdf.

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ABSTRACT ELECTROCHEMICAL SYNTHESIS OF CROWNED CONDUCTING POLYMERS: NATURE OF RADICAL CATIONS IN POLYMERIZATION AND MECHANISM OF CONDUCTIVITY Cihaner, Atilla Ph. D., Department of Chemistry Supervisor: Prof. Dr. Ahmet M. &Ouml<br>nal June 2004, 96 Pages Poly(dibenzo-18-crown-6) (Poly(DB18C6)) was synthesized by electrochemical oxidation of dibenzo-18-crown-6 (DB18C6) using a mixture of acetonitrile and dichloromethane as solvent and tetrabutylammonium tetrafluoroborate (TBABF4) or tetrabutylammonium hexafluorophosphate (TBAPF6) as supporting electrolyte. The anodic polymerization of DB18C

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44

Taghavikish, Mona. "Tetrakis(2,6-diisopropylphenyl)diphosphine and related compounds : an electrochemical and EPR spectroscopic study of radical cations." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Chemistry and Biochemistry, c2012, 2012. http://hdl.handle.net/10133/3310.

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In this thesis the synthesis and full characterization of a new bulky diphosphine, tetrakis-(2,6-diisopropylphenyl)diphosphine, are described. This compound displays facile oxidation and a thorough investigation of its redox properties has been studied by combining solution electrochemical techniques such as cyclic voltammetry (CV) and rotating disk electrode (RDE) voltammetry, with spectroscopic methods such as electron paramagnetic resonance (EPR) and Simultaneous Electrochemical Electron Paramagnetic Resonance (SEEPR) spectroscopy over a wide temperature range. Density functional theory (DF

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45

Mason, Kyle. "Stepwise Solvation of Organic Radical Cations by Ionic Hydrogen and Halogen Bonding in the Gas Phase." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6024.

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The ability to characterize the interactions between ions and solvent molecules plays a critical role in understanding fundamental aspects of thermodynamics in solution chemistry. These interactions are often difficult if not impossible to observe in solution due to the number of solvent molecules far exceeding that of the ions. However, this challenge can be circumvented in the gas phase which enables the isolation and study of reactions between a single ion and single solvent molecule. Within the field of ion-molecule chemistry are two sub-categories of interactions known as ionic hydrogen b

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46

Lay, Alexander Kit. "New π-electron donor systems based on 1,4-dithin derivatives". Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4725/.

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A review of organic, π-electron donor molecules is given. The focus is on non- tetrathiafulvalene based systems. Polycyclic arenes, thioalkyl substituted arenes, chalcogenated fulvalenes, peri-dichalcogen bridged polycyclic arenes and heteroarenes are covered. Various π-electron donor molecules based on acenaphtho[ 1,2-b][ 1,4]-dithin have been synthesised via various methodologies. The redox properties of these molecules, as studied by cyclic voltammetry, provide evidence that these species are efficient π-electron donors. A selection of these compounds have also been studied by Electron Spin

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47

Zerelli, Mariem. "Vers une chimie plus douce : de nouveaux systèmes photoamorceurs hautes performances pour la polymérisation radicalaire, cationique et anionique dans les conditions plus respectueuses de l'environnement." Thesis, Mulhouse, 2017. http://www.theses.fr/2017MULH0778/document.

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De nos jours, la polymérisation par voie photochimique connaît un grand essor dans différents domaines académiques et industriels comme en témoigne son nombre croissant d’applications. Les photopolymères sont omniprésents dans plusieurs domaines tels que les revêtements, le domaine dentaire, les implants chirurgicaux, les encres, l’impression 3D… Cependant, les avancées réalisées par rapport à cette voie de synthèse de matériaux polymères restent limitées et nécessitent encore plus de recherches et de développements. Cette nouvelle génération de polymères synthétisée par voie photochimique pré

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48

De, Lijser Hubrecht Johan Peter. "Studies on the interconversion and rearrangement of C¦4H¦6 and C¦8H¦1¦2 radical cations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24751.pdf.

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49

Xie, Gaozhan Verfasser], and Uwe H. F. [Akademischer Betreuer] [Bunz. "Synthesis and Characterization of Azaacenes and Stable Azaacene Radical Cations / Gaozhan Xie ; Betreuer: Uwe H. F. Bunz." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1216506620/34.

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50

Xie, Gaozhan [Verfasser], and Uwe H. F. [Akademischer Betreuer] Bunz. "Synthesis and Characterization of Azaacenes and Stable Azaacene Radical Cations / Gaozhan Xie ; Betreuer: Uwe H. F. Bunz." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1216506620/34.

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