In this thesis , we studied the photo-chemistry between the green emitter (C545T) and the photo-acid generator (PAG) . When the sample of C545T and PAG in solutions and thin films were exposured to UV-light , we found that a new product was produced due to protonation of C545T with the acid generated by PAG . Therefore , we measured absorption and fluorescence spectra of the samples in solutions (THF) and in polymer (PMMA) thin films . The different concentrations of C545T dopanted photo-acid generator in the solvent (THF) could increase the photo-acid generator at higher concentrations of PAG , the energy could be transferred from unprotonated to protonated . Therefore , we can easily observe the absorption and fluorescence spectra have been changed and the phenomenon of stock¡¦s shift has been found accordingly . At higher concentrations of C545T in solutions , also called concentrations quenching effect was observed because C545T molecules could collide each other easily that causes intensity to decrease in the solvent (THF) . In order to get rid of the collision effect , we use the samples of polymer thin films instead of solutions . The different of the change of spectra between solutions and thin films were observed and compared were also studied .

Three examples of bis(diaryliodonium) perfluorosulfonimide (BDI-PFSI) zwitterions have been prepared as a potential new class of ionic photo-acid generators for chemically amplified photoresist formulations.

As technology advances, a need for non-metal, conductive materials has arisen for several types of applications. Lithographic techniques are helpful to develop some of these applications. Such techniques require materials that are insulating and become conductive after irradiated. Composites of polyaniline in its emeraldine base form (PANI-EB) doped with photo-acid generators (PAG) become conductive upon photo-irradiation. This increase in conductivity is due to the protonation of PANI-EB. Such materials may be utilized to fabricate conducting patterns by photo-irradiation; however, the conductivity obtained by direct irradiation of PANI-EB/PAG composites is normally quite low (<10-3 S/cm) due to aggregation of highly loaded PAG. In this work, poly(ethylene glycol) (PEG), a proton transfer polymer, was added to PANI-EB/PAG. Results showed the addition of low molecular weight (MW) (550) PEG significantly enhanced the photo-induced conductivity to a level comparable to that of PANI-salt synthesized by oxidizing aniline in the presence of an acid. High MW (8000) PEG is less effective than PEG 550, and composites of PANI-EB and N-PEG-PANI showed conductivity as high as 102 S/cm after treatment with HCl vapor. The photo-induced conductivity of the N-PEG-PANI/PANI-EB/PAG composite reached 10-2-10-1 S/cm. Polychlorinated biphenyls (PCBs) are a class of chemicals with 209 different congeners, some of which are known carcinogens, and are persistent organic pollutants in the environment. After its synthesis, it was seen as a phenomenal additive in a multitude of different applications leading to the wide spread use of PCBs and a need for a safe, effective, and inexpensive remediation technique. While it is known that magnesium can degrade PCBs, the mechanism of this reaction was not well-understood. In order for magnesium to be broadly used as a remediation tool, it is necessary to fully understand how the reaction is taking place and if the PCBs are able to be fully dechlorinated into biphenyl. This research focuses on the hydrodechlorination of PCBs with zero-valent magnesium in acidified ethanol. The degradation pathways of 2, 2', 3, 5, 5', 6- hexachlorobiphenyl were investigated to determine the identity of the daughter PCBs produced, how and if they continue to be dechlorinated into biphenyl. The proton source for this hydrodehalogenation reaction was also studied using both deuterated solvent and acid to give more detail to the mechanism of this reaction.

Alors que le procédé sol-gel a été fortement étudié il existe peu d’études concernant le procédé sol-gel photoinduit. Le principe repose sur la libération in situ d’espèces acides ou basiques photogénérées capables d’amorcer les réactions d’hydrolyse et de condensation caractéristiques du procédé sol-gel. L’alternative photoinduite est particulièrement adaptée pour préparer des films minces et possède de nombreux avantages tel qu’une formulation de départ stable, sans solvant et photolatente ainsi que des vitesses de réactions plus importantes. À partir de précurseurs inorganiques simples, nous avons dans un premier temps réalisé une étude mécanistique et cinétique de ce procédé en catalyse acide. Puis l’influence de différents paramètres physiques, chimiques et photochimiques sur les vitesses de réactions a été évaluée. Une comparaison avec un système similaire en catalyse basique a aussi été réalisée.Dans un second temps, nous nous sommes intéressés à appliquer ce procédé photoinduit pour la préparation de films de silice mésoporeuse. Un tensioactif de type copolymère tribloc a été ajouté au précurseur inorganique de départ. La faisabilité d’une approche photochimique à partir de formulation sans eau ni solvant a d’abord été étudiée, des films mésoporeux ont été obtenus. Puis, nous nous sommes intéressés à la compréhension des 2 mécanismes interdépendants : le mécanisme d’assemblage du tensioactif et la condensation du réseau inorganique. Par la suite, le système a été optimisé pour aboutir à un contrôle précis de la structure et de la taille des pores. Enfin, une dernière étape a consisté à éliminer la partie organique (pour libérer la porosité) grâce à l’UV. / Whereas sol-gel process has been extensively studied almost no papers concerning photoinduced sol-gel process subsists. This later is based on in situ generation of acids or basics species able of initiating hydrolysis and condensation reactions happening on sol-gel process. This photoinduced alternative is particularly adapted for preparation of thin films and has lots of advantages such as photolatent, stable, solvent and water free initial formulation along with faster reaction rates. In one hand, from simple inorganic precursors, a kinetic and mechanistic study of the photoacid-catalyzed sol-gel reactions was realized. Then, we attempt to define what chemical, physical and photochemical parameters determine the precise sequence, kinetics and advancement of these reactions under different processing conditions Furthermore, an equivalent photobase-catalyzed sol-gel process has been also studied thoroughly. In a second hand, we focus on application of this photoinduced process for the preparation of mesoporous silica films. A triblock copolymer surfactant was added to the initial inorganic precursor. Feasibility of this photochemical approach from water and solvent free formulation was first investigated and mesoporous films were obtained. Then, we work on understanding the two interdependent mechanisms: surfactant self-assembly and inorganic network condensation. The system was after that optimized in order to have a precise control of pore size and structure. Finally, the last point involves organic photodegradation in order to liberate porosity.