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Dissertations / Theses on the topic 'Thioxanthene'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 July 2025

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1

Nik, Salleh Nik Ghazali. "Photochemistry and photopolymerisation activity of novel benzophenone and thioxanthone derivates." Thesis, Manchester Metropolitan University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263447.

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2

Kucina, Dennis [Verfasser]. "Untersuchungen zur Effizienz der Triplettsensibilisierung mit Thioxanthonen / Dennis Kucina." Konstanz : Bibliothek der Universität Konstanz, 2011. http://d-nb.info/1022323733/34.

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3

Ferreira, Giovana Chimello. "\"Fotopolimerização iniciada por tioxantona e outros indicadores - Estudos fundamentais e aplicações\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-29012007-112944/.

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A cinética de fotopolimerização do monômero metacrilato de metila (MMA) foi investigada usando o fotoiniciador tioxantona (TX) e o co-iniciador trietilamina (TEA), a fim de elucidar o mecanismo de fotopolimerização. A dilatometria foi usada como técnica para a determinação das cinéticas de polimerização. Determinaram-se os rendimentos quânticos de polimerização. Os estados excitados foram estudados por fluorescência estática para determinar as constantes de supressão de fluorescência pela amina e pelo monômero. Medidas de fotólise por pulso de laser permitiram obter o espectro de absorção trip

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4

Deters, Dirk. "Allgemeine Synthese von Paraxanthin- und Isoparaxanthin-Analogen und Darstellung S-substituierter 2-Thioxanthine als Adenosinrezptor-Antagonisten /." [S.l. : s.n.], 1996. http://www.gbv.de/dms/bs/toc/215277759.pdf.

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5

Valandro, Silvano Rodrigo. "Fotoiniciadores baseados em quitosana/tioxantona e argila/tioxantona: síntese, caracterização e aplicação em reações de polimerização e formação de nanopartículas metálicas." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-07022018-103511/.

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Este trabalho aborda a síntese, caracterização e estudo dos processos fotoquímicos e fotofísicos de materiais distintos baseados em corante/biopolímero e corante/argila. Os resultados e a discussão obtidos com estes materiais foram distribuídos em três capítulos, os quais foram intitulados: (i) Macrofotoiniciador biopolimérico baseado em quitosana e derivado de tioxantona; (ii) Fotoiniciador híbrido orgânico-inorgânico baseado em argila mineral e derivado de tioxantona e (iii) Híbridos orgânico-inorgânicos: fotofísica no estado sólido dos corantes auramina O e isocianina adsorvidos em argilas.

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6

Ley, Christian. "Propriétés photophysiques et photochimiques de thioxanthones : spectroscopie des états excités et dynamiques de solvatation." Mulhouse, 1999. http://www.theses.fr/1999MULH0584.

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Dans les réactions de photopolymérisation, la vitesse de polymérisation dépend des propriétés photophysiques et photochimiques du photoamorceur. Les thioxanthones sont efficaces comme sources de radicaux libres amorceurs de polymérisation avec des amines. Afin d'en améliorer les propriétés photophysiques et photochimiques de nombreuses thioxanthones substituées, solubles dans de nombreux milieux, ont été créées. Une étude des effets de solvants sur un photoamorceur modèle, la thioxanthone (TX) a été effectuée. Dans ce but des techniques de spectroscopie d'absorption résolues dans le temps pico

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7

Pinto, Leticia Felipe Abdias. "Preparação e caracterização fotoquímica de derivado de S,S-dioxidotioxantona: aplicações em fotopolimerização." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-24022014-114205/.

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Neste trabalho foi realizada a síntese e caracterização de um derivado de S,S-dioxidotioxantona, 7,8-benzotioxanton-9-ona-10,10-dióxido (TX-Np-SO2). A TX-Np-SO2 foi caracterizada estruturalmente por espectros eletrônico e vibracional (UV-vis e fluorescência, Infravermelho) e também por ressonância magnética nuclear (RMN) de 1H e 13C. As propriedades fotofísicas, espectros de emissão de fluorescência e fosforescência e o rendimento quântico de fluorescência da TX-Np-SO2 foram determinadas, assim como os tempos de vida de fluorescência (τF = 3,62 ns) e fosforescência (τPh = 800 ms). Os e

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8

Marasanapalle, Venugopal P. "In vitro permeability studies of antitumor compounds, thioxanthones across two model barriers, and their availability in vivo." Scholarly Commons, 2003. https://scholarlycommons.pacific.edu/uop_etds/580.

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One of the reasons for poor response of tumors is their three dimensional structure (micro-environment), which forms a penetration barrier to anti-tumor agents. A drug has to cross the interstitial space of tumors and many layers of cells to reach the interior of a tumor. The main objective of this study was to develop two new in vitro models to evaluate the in vivo availability of antitumor compounds to solid tumors. Two in vitro models, basement membrane p:1atrix of Engelbreth-Holm Swarm (EHS) mouse sarcoma (Matrigel) and human colorectal adenocarcinoma (Caco-2) multilayers were developed. T

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9

Villnow, Torben [Verfasser], Peter [Akademischer Betreuer] Gilch, and Rainer [Akademischer Betreuer] Weinkauf. "Schnelle Interkombination aromatischer Carbonylverbindungen am Beispiel von Thioxanthon und Anthrachinon / Torben Villnow. Gutachter: Peter Gilch ; Rainer Weinkauf." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2015. http://d-nb.info/1067553371/34.

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10

Bernardo, Douglas Rosa. "Fotofísica e fotoquímica de tioxantonas aneladas e avaliação de sua eficiência como fotoiniciador na polimerização de diacrilatos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-28042011-163717/.

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Foram sintetizados a 5-tia-pentaceno-14-ona (TX-A) e a 5-tia-naftaceno-12-ona (TX-Np), dois compostos derivados da tioxantona, para serem usados como fotiniciadores em reações de polimerização de diacrilatos. Após purificação usando cromatografia em coluna e líquida de alta eficiência, esses compostos foram caracterizados por análise elementar (AE), espectroscopia na região do infravermelho (IV) e de ressonância magnética nuclear de próton (1H RMN). A caracterização do comportamento espectroscópico dos compostos foi feita utilizando-se espectroscopia na região do ultravioleta e visível (UV-vis

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11

Burget, Dominique. "Etude comparative de l'inhibition par transfert d'électron des états excites singulet et triplet d'une thioxanthone : influence de la nature du donneur et du solvant." Mulhouse, 1992. http://www.theses.fr/1992MULHA253.

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Les effets du solvant sur les propriétés spectroscopiques de la thioxanthone (TX) et la 7-méthy-3-carbethoxy thioxanthone (ETX) ont été corrélés en fonction des paramètres solvatochromiques de Kamlet, Aboud et Taft. De manière surprenante, TX et ETX obéissent à la même relation linéaire entre la durée de vie et le rendement quantique de fluorescence sur une large plage de polarité de solvant. L'influence du donneur sur la cinétique d'inhibition par transfert d'électron des états excités singulet et triplet des thioxanthones ainsi que de molécules de référence (9,10-dicyanoanthracène, des céton

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12

Rodrigues, Janaina de Faria. "Estudo do efeito de substituintes na fotoqu?mica de tioxantona por fot?lise por pulso de laser em nanossegundo." Universidade Federal Rural do Rio de Janeiro, 2010. https://tede.ufrrj.br/jspui/handle/jspui/1975.

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Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-08-18T16:17:20Z No. of bitstreams: 1 2010 - Janaina de Faria Rodrigues.pdf: 2153676 bytes, checksum: 8429cd74e923c45f3d05970bcdff87d2 (MD5)<br>Made available in DSpace on 2017-08-18T16:17:20Z (GMT). No. of bitstreams: 1 2010 - Janaina de Faria Rodrigues.pdf: 2153676 bytes, checksum: 8429cd74e923c45f3d05970bcdff87d2 (MD5) Previous issue date: 2010-06-15<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico, CNPq, Brasil.<br>By laser flash photolysis, the photo-reactivity of the triplet excited state of thioxanthone derivativ

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13

Morice, Korentin. "Exploration du Benzothioxanthène imide : fonctionnalisation et utilisation." Electronic Thesis or Diss., Angers, 2025. http://www.theses.fr/2025ANGE0003.

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Ces trois années de thèse se sont concentrées sur l'exploration de la réactivité du benzothioxanthène imide (BTI) afin d'obtenir de nouveaux dérivés à fort potentiel pour diverses applications allant de la thérapie photodynamique à l'électronique organique. Ce travail de synthèse approfondi, de fonctionnalisation et de rationalisation des relations entre structure et propriétés a ouvert de nouvelles perspectives pour la conception de nouveaux matériaux ainsi que pour leurs utilisations. Suite à un chapitre d'introduction consacré à ce composé encore peu étudié, le deuxième chapitre s'est porté

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14

(9605984), Teng Chi. "THIOXANTHONE BASED PHOTOINITIATORS FOR TWO-PHOTON NANOLITHOGRAPHIC PRINTING." Thesis, 2020.

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Printing of 3-dimensional nanostructures with high-resolution by two-photon polymerization has gained significant attention recently. Isopropyl thioxanthone (ITX) has been studied and used as a photoinitiator because of its unique property in initiating and depleting polymerization, but to further improve the resolution of 3D structures, new photoinitiating materials are necessary to decrease the power requirements especially in industrial world. In this dissertation, different new types of thioxanthone-based photoinitiators were synthesized and our new initiators possessed a clear enhancement

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15

yen, ch, and 葉翠琴. "Synthesis and Antiallergic Activity of 2-Aminomethyl thioxanthen-9-ones." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/22016986672636882176.

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16

Zhu, Pei Long, and 朱培龍. "Synthesis and antiallergic activity of 2-substituted thioxanthen-9-ones." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/65323192947389788574.

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17

Chan, kao Jia, and 高佳園. "Synthesis and Antiallergic Activity of 2,7-Disubstituted Thioxanthen-9-ones." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/06130753563618092805.

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碩士<br>中國醫藥學院<br>藥物化學研究所<br>89<br>For bioisosteric designing antiallergic agents , a series of 2, 7-disubstituted thioxanthen-9-ones (36∼56) have been synthesized by the cyclization of 2, 5-disubstituted benzoic acids (18∼35) with concentrated sulfuric acid and then reduced of 2, 7-disubstituted thioxanthen-9-ones (36∼39) with iron/ammonium chloride in ethanol/water under reflux conditions to give only the corresponding 2-amino substituted derivatives (53∼56). Structures of these products were fully identified by IR , MS , UV , 1H-NMR and 13C-NMR spectral analyses . The s

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18

Shih, Liu-Chuan, and 施劉佺. "Design, Synthesis and Antitumor Studies of Novel Thioxanthone Ring System Derivatives." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/80392179561488242301.

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碩士<br>國防醫學院<br>藥學研究所<br>98<br>Several intrinsic tumor suppressor mechanisms have been found in long-lived organisms such as human to combat the oncogenic somatic mutations which usually arise in proliferating stem-cell compartments. Telomere is a specialized nucleoprotein complex of eukaryotic chromosome. Besides, it is one of the anticancer topic with telomerase. Telomerase, acting as a reverse transcriptase, has been identified as a target for cancer drug discovery. In fact, Most human tumors do not only express telomerase but also have very short telomeres, whereas telomerase activity is ei

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19

Cheng, Yu-Cheng, and 鄭育承. "The Development of Thioxanthone-Ethylcarbazole Visible-Light Photoinitiator for the Application of Stereolithography." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/17084085042189377499.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>103<br>In this study, the development of visible light driven photoinitiator for photopolymers has been addressed. After a series of synthetic steps, the thioxanthone-ethylcarbazole (TX-EC) has been successfully prepared as a photoinitiator for free radical polymerization. TX-EC has excellent absorption characteristics in the visible spectrum, where the maximum absorbance is close to 450 nm and extended to 475 nm. Besides that, TX-EC is expected to undergo an irreversible photolysis, due to the presence of hydrogen donating sites adjacent to the N atom of the carbazo

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20

Deters, Dirk. "Allgemeine Synthese von Paraxanthin- und Isoparaxanthin-Analogen und Darstellung S-substituierter 2-Thioxanthine als Adenosinrezeptor-Antagonisten /." 1996. http://www.gbv.de/dms/bs/toc/215277759.pdf.

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21

Pandey, Rishikesh. "Understanding Solvent Effect On Triplet State Structure Of Thioxanthone And Its Derivatives Using Time-Resolved Resonance Raman Spectroscopy." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2307.

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It has long been recognized that course and efficiency of a chemical reaction is largely mediated by the short-lived transient species (excited state or radicals) which are formed as reactive intermediates during a chemical reaction. Subtle changes not only in the bonding and electronic distributions but also in the conformations and geometries of these intermediates have a dramatic influence on the reactivity. A detailed understanding of the structural and dynamical aspects of electronic excited states is therefore essential towards unraveling photoinduced natural processes and for designing

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22

Pandey, Rishikesh. "Understanding Solvent Effect On Triplet State Structure Of Thioxanthone And Its Derivatives Using Time-Resolved Resonance Raman Spectroscopy." Thesis, 2012. http://hdl.handle.net/2005/2307.

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It has long been recognized that course and efficiency of a chemical reaction is largely mediated by the short-lived transient species (excited state or radicals) which are formed as reactive intermediates during a chemical reaction. Subtle changes not only in the bonding and electronic distributions but also in the conformations and geometries of these intermediates have a dramatic influence on the reactivity. A detailed understanding of the structural and dynamical aspects of electronic excited states is therefore essential towards unraveling photoinduced natural processes and for designing

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23

Liu, Ting-Yu, and 劉廷昱. "Photopolymerization properties of Type II photoinitiator based on Thioxanthone hydrogen acceptor and various amine-type hydrogen donors." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ay6sy4.

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碩士<br>國立高雄科技大學<br>化學工程與材料工程系<br>107<br>In this work, we investigated the double bonds conversion efficiencies (DC values) based on different Type II photoinitiator packages through gel fraction method. The formulations are including a trifunctional monomer of trimethylolpropane trimethacrylate (TMPTMA), hydrogen acceptor of Thioxathone (TX) and five amine-type hydrogen donors N-Phenylglycine (NPG), Triethylamine (TEA), Triethanolamine (TEOA), 2,2'-(4-Methylphenylimino)diethanol (p-TDEA), N-Phenyldiethanolamine (n-PDEA), respectively. Among those formulations, the TX/TEOA photoinitiator package

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24

Kayal, Surajit. "Understanding Ultrafast Molecular Structural Dynamics in Liquids : Ultrafast Raman Loss and Transient Absorption Study." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4210.

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The present thesis deals with the detailed ultrafast experimental studies on the ex-cited state vibrational dynamics of model chemical systems in condensed phase. The molecular systems are studied by means of Ultrafast Raman Loss Spectroscopy (URLS) and femtosecond transient absorption (TA) spectroscopy. The primary objective of the current thesis is to look at structural dynamics immediately after Franck-Condon excitation, influenced by surrounding solvent molecules. The thesis is divided into six chapters and a brief summary of each chapter is given below. In Chapter 1, I have included

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