Дисертації з теми "Hydrogen donors"
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Lavrov, Eduard V. "Hydrogen donors in ZnO and TiO2." SPIE, 2017. https://tud.qucosa.de/id/qucosa%3A34876.
Повний текст джерелаLane, Jakob. "Dual Hydrogen Bond Donors for Anion Recognition." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/27262.
Повний текст джерелаBowyer, Ellis T. "Electrical detection of hydrogen-like donors in silicon." Thesis, University of Surrey, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616937.
Повний текст джерелаCarter, Justin Michael. "Hydrogen sulfide releasing donors and their benefits to crop growth." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6554.
Повний текст джерелаAuvil, Tyler Jay. "Unique Reactivity Patterns Catalyzed by Internal Lewis Acid Assisted Hydrogen Bond Donors." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1395759920.
Повний текст джерелаBarth, Florian Verfasser], and Hendrik [Akademischer Betreuer] [Zipse. "Heterocyclic borane complexes as hydrogen atom donors in reduction reactions / Florian Barth. Betreuer: Hendrik Zipse." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2015. http://d-nb.info/108012229X/34.
Повний текст джерелаBrown, Adam Ross. "I. Engaging Cationic Intermediates in Asymmetric Catalysis: Enantioselective Reactions of Carbenium Ions and N,N-Dialkyliminium Ions II. Enantioselective Catalysis of the Cope-Type Hydroamination by H-Bond Donors." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11009.
Повний текст джерелаChemistry and Chemical Biology
Wolf, Inka M. "Metal containing and metal free organocatalysts: new design concepts for hydrogen bond donors and substrate activation = Metallhaltige und metallfreie Organokatalysatoren: Entwicklung von neuartigen Konzepten von wasserstoffbrücken Donoren und zur Substrat-Aktivierung." kostenfrei, 2010. http://d-nb.info/100061364X/34.
Повний текст джерелаSchafer, Andrew Gerard. "Silanediols As Hydrogen Bond Donor Catalysts." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1396442513.
Повний текст джерелаLewis, Rhobert. "Proton acceptor-proton donor interactions in gases and low temperature matrices." Thesis, University of South Wales, 1990. https://pure.southwales.ac.uk/en/studentthesis/proton-acceptorproton-donor-interactions-in-gases-and-low-temperature-matrices(bb889443-24fd-427e-b994-522a416d5988).html.
Повний текст джерелаTurek, Amanda Katherine. "Activation of Electron-Deficient Quinones Through Hydrogen-Bond-Donor-Coupled Electron Transfer." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:23845499.
Повний текст джерелаChemistry and Chemical Biology
Kleks, Guy. "Development of NMR Methodology for Complex Mixture Analysis and Discovery of Antiplasmodial Marine Natural Products." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/401350.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment and Sc
Science, Environment, Engineering and Technology
Full Text
Huseynzade, Samir. "Upgrading and enhanced recovery of Jobo heavy oil using hydrogen donor under in-situ combustion." Texas A&M University, 2007. http://hdl.handle.net/1969.1/85865.
Повний текст джерелаInokuma, Tsubasa. "Development of Novel Hydrogen-Bond Donor Catalysts Bearing Amino or Hydroxy Group for Asymmetric Synthesis." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/152053.
Повний текст джерелаChen, Jing. "Novel H-bond donor polymers for layer-by-layer self-assembly multilayered films." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0087/document.
Повний текст джерелаThis work deals with the design of novel hydrogen-bond donor polymers and their use as partner in new tailor-made multilayered films prepared by the layer-by-layer (LbL) process. In this context, a novel regioselective and chemoselective “click-type” reaction of unprotected mercaptoalcohols onto poly(2,3,4,5,6-pentafluoro-styrene) (PPFS) has been developed, and applied to the synthesis of new hydroxylated H-bond donor polymers. This coupling with heterofunctional thiol is used to prepare a library of polymers differing in the degree of substitution (DS) and/or functionality. The fine control of these parameters makes it possible to tune their interaction ability with various acceptor polymers such as poly(4-vinyl pyridine) (P4VP), poly(n-butyl acrylate) (PBA) and poly(ethylene oxide) (PEO), such that all possible scenarios (immiscible blend, partially or totally miscible blend or interpolymer complex) can be achieved. Subsequently, the resulting H-bond donor polymers (PPFS derivatives) were used to successfully build-up multilayered films with using P4VP as partner via layer-by-layer (LbL) through the dip deposition process. The influence of various parameters related to structure of the partners (DS, nature of the PPFS derivatives), the chemical structure of the surface onto which the film is built-up (self-assembled monolayer vs. polymer brush) and the deposition process (concentration of deposition solutions, nature of the first deposited partner) was in-depth evaluated, on both the growth mechanism and on the surface features of the multilayered films
Sage, 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.
Повний текст джерелаNurioglu, Ayda Goycek. "Syntheses And Characterization Of Benzimidazole Containing Polymers: A Comparitative Study On Donor Unit Effect And Influence Of H-bonding." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615436/index.pdf.
Повний текст джерелаSo, Sonia. "Boronate Urea Activation of Nitro Compounds." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1395764122.
Повний текст джерелаWieting, Joshua Merlin. "Silanediol-Catalyzed Stereoselective Functionalization of Heterocycles." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1448891366.
Повний текст джерелаMohammad, Ahmad A. A. "Experimental investigation of in situ upgrading of heavy oil by using a hydrogen donor and catalyst during steam injection." Texas A&M University, 2008. http://hdl.handle.net/1969.1/86051.
Повний текст джерелаZhao, Long Verfasser], Dieter [Akademischer Betreuer] [Enders, and Markus [Akademischer Betreuer] Albrecht. "Organocatalytic asymmetric domino reactions via N-heterocyclic carbene and bifunctional hydrogen-bonding donor catalysts / Long Zhao ; Dieter Enders, Markus Albrecht." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1181108926/34.
Повний текст джерелаZhao, Long [Verfasser], Dieter [Akademischer Betreuer] Enders, and Markus [Akademischer Betreuer] Albrecht. "Organocatalytic asymmetric domino reactions via N-heterocyclic carbene and bifunctional hydrogen-bonding donor catalysts / Long Zhao ; Dieter Enders, Markus Albrecht." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1181108926/34.
Повний текст джерелаOlaiya, Babatunde Samuel. "Stabilized Photocatalytic Hydrogen Generation using a Molecular Ru(II) Sensitizer, a Molecular Cobalt Catalyst and an Amine Derivative as an Electron Donor." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1371066177.
Повний текст джерелаBaldwin, Andrea Michelle. "Synthesis and Functionalization of Heterocycles via Non-Covalent Catalysis." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1467277822.
Повний текст джерелаTorres, Palacio Paulo Cesar. "Síntesis, propiedades, caracterización y aplicaciones químicas de novedosos disolventes eutécticos profundos: DES (Deep Eutectic Solvents)." Doctoral thesis, Universitat de Lleida, 2021. http://hdl.handle.net/10803/673075.
Повний текст джерелаLas mezclas de bajo punto de fusión o mezclas eutécticas denominadas DES por sus siglas en inglés (Deep Eutectic Solvents), son básicamente mezclas preparadas a partir de compuestos aceptores de puentes de hidrógeno llamados HBA, (generalmente sales de amonio cuaternarias) y donantes de puentes de hidrógeno de diferente naturaleza (HBD), por ejemplo, alcoholes, ácidos, aminas y carbohidratos; que forman sistemas que contienen una amplia variedad de especies catiónicas y/o aniónicas regidas por interacciones, principalmente de puentes de hidrógeno, que presentan una baja energía de enlace que causan los bajos puntos de fusión que estas presentan. Precisamente, esta es una de las características importantes a la hora de emplear los diferentes tipos de DES, dependiendo del tipo de reacción y/o proceso sintético. Por ejemplo, estos disolventes eutécticos han sido ampliamente utilizados y estudiados en procesos de extracción de biomasa, síntesis de polímeros, catálisis, electroquímica, síntesis de nanopartículas, entre otros. En el presente trabajo se presenta la preparación de diferentes novedosos disolventes eutécticos de base biológica, a partir de glicerol (Gly). Este glicerol fue obtenido mediante la hidrólisis y trans-esterificación de grasas animales no comestibles, y luego empleado para sintetizar el alcohol 3-cloro-1,2-propanodiol, que es el precursor del compuesto racémico de interés: el cloruro de rac-2,3-dihidroxipropiltrietilamonio: [Et3N+CH2CH(OH)CH2OH]Cl-, [C9H22N+O2]Cl- o (DPTAC). Dicho compuesto se sintetizó empleando el cloroalcohol obtenido, trietilamina y metanol. El compuesto (DPTAC) que inicialmente fue obtenido en forma de mezcla racémica, fue transformado en un compuesto enantiomericamente enriquecido mediante un proceso de acetilación quimioenzimática y de acetilación directa empleando acetato de isopropileno, con el fin enriquecer enantiomericamente este compuesto racémico. Además, se obtuvo el cloruro de S-(-)-2,3-dihidroxipropiltrietilamonio (S)-(-)-(DPTAC), partiendo del alcohol precursor ópticamente puro. Estas sales fueron acetiladas directamente con anhídrido acético y empleadas como componente HBA, en presencia de tres compuestos de base biológica: glicerol (Gly), ácido láctico (LA) y urea que actuaron como compuesto HBD en la formación de cada una de las mezclas eutécticas (DES). Además, el etilenglicol (EG) fue también utilizado para formar otro DES concreto. Es importante tener en cuenta que, el diseño de estos disolventes se realizó empleando la estrategia de “diseño modular” para que cada DES contenga un HBA de naturaleza y propiedades diferentes. En este trabajo es presentado el estudio de las propiedades físicas (viscosidad, densidad, relación estequiométrica, entre otras) de cada DES. Posteriormente, se estudió su empleo como disolventes en diferentes procesos químicos; donde, los DES preparados fueron utilizados como disolventes en el proceso de fraccionamiento y extracción de material ligno-celulósico en diferentes muestras de biomasa de madera dura como son: el orujo de oliva, y la poda de ramas (de tipo leñoso) de árboles frutales. Los resultados mostraron la obtención de lignina tipo Klasson y de fracciones ricas en holocelulosa utilizando cada uno de los DES. Asimismo, los DES preparados fueron utilizados para estudiar su influencia sobre la formación de los aductos endo:exo, en reacciones típicas de ciclación [4π+2π] tipo Diels-Alder, entre el ciclopentadieno con acrilato de etilo y acrilato de butilo. Por otra parte, con base en los requerimientos del proceso, fueron seleccionados los DES adecuados para ser utilizados como medios de reacción, en la obtención de alcoholes quirales secundarios mediante la reducción de cetonas pro-quirales en presencia de NaBH4. La riqueza enantiomérica de los alcoholes producidos se estudió empleando un reactivo de derivatización quiral (reactivo de Mosher). De esta manera se estudió la configuración absoluta del alcohol: 1-feniletanol (12) (obtenido como producto de la reacción anterior).
Low melting mixtures or Deep eutectic mixtures called DES (Deep Eutectic Solvents) are prepared from hydrogen bond acceptors called HBA, (usually a quaternary ammonium salt), and different hydrogen bond donors (HBD) for example alcohols, acid amines, and carbohydrates; form systems that contain a wide variety of cationic and/or anionic species governed by hydrogen bonding interactions that present low binding energy, causing their low melting points. This is one of the important characteristics when using the different types of DES, in terms of the type of reaction and/or synthetic process; for example, these eutectic solvents have been widely used and studied in biomass extraction processes, polymer synthesis, catalysis, electrochemistry, nanoparticle synthesis, among others. This work presents the preparation of several novel bio-based eutectic solvents from glycerol (Gly), which was obtained by hydrolysis and trans-esterification of inedible animal fats and then used to synthesize alcohol 3-chloro-1,2-propanediol, which is the precursor of the racemic compound: rac-2,3-dihydroxypropyltriethylammonium chloride: [Et3N+CH2CH(OH)CH2OH]Cl- (DPTAC). This compound was synthesized using the mentioned chloro-alcohol, triethylamine, and methanol. Compound (DPTAC) that was initially obtained as a racemic mixture, was transformed into an enantiomerically enriched compound employing chemoenzymatic acetylation and direct acetylation process using isopropylene acetate to separate the racemic mixture. Similarly, S-(-)-2,3-dihydroxypropyltriethylammonium chloride was obtained starting from the optically pure precursor alcohol. All these salts were acetylated directly with acetic anhydride. All of them were used as HBA to prepare different eutectic mixtures (DES). Thus, three bio-based compounds were used: glycerol (Gly), lactic acid (LA), and urea as HBD to form each of the mixtures. Finally, ethylene glycol (7) was also used to form a specific DES. It is important to note that the design of these solvents was carried out using the strategy of "modular design" in which each DES contains an HBA of different nature and properties. Initially, the study of the physical properties (viscosity, density, stoichiometric ratio, among others) of each DES is presented. Subsequently, their use as solvents in different chemical processes is also studied, the DES prepared were used as solvents in the process of fractionation and extraction of lignocellulosic material in different samples of hardwood biomass, such as olive pomace, and pruning of branches (woody type) of fruit trees. Results showed the obtaining of Klasson-type lignin and fractions rich in holocellulose using each of the DES. DES prepared were used to study their influence on the formation of endo: exo adducts, in a typical [4π + 2π] Diels-Alder type cyclization reactions, between cyclopentadiene with ethyl acrylate and butyl acrylate. On the other hand, based on the process requirements, suitable DES were selected to be used as reaction media to obtain chiral secondary alcohols by reducing pro-chiral ketones in the presence of NaBH4. The enantiomeric richness of the alcohols produced was studied using a chiral derivatization reagent (Mosher's reagent). In this way, the absolute configuration of the alcohol was studied: 1-phenylethanol (12) (obtained as a product of the previous reaction). In addition, preliminary tests were carried out to assess the possibility of recycling the DES obtained. For this reason, the initial DES prepared between the racemic compound (DPTAC) with the four HBD compounds were fractionated using a strong cation exchange resin to verify the ease with which they are separable; besides, being reusable and recyclable. Conditions that a solvent must meet to be considered within the “Green Solvents” category. Taking into account that the starting materials for the formation of eutectic mixtures are almost entirely bio-based compounds. All the precursor compounds and DES prepared were characterized by FT-IR and 1H and 13C NMR spectroscopy techniques; the racemic compound was analyzed by mass spectrometry; the proportion between the adducts formed in the Diels – Alder reactions was studied using GC-FID gas chromatography (230 ° C and 270 ° C); Optical activity and specific angle of rotation were measured on enantiomerically enriched and optically pure compounds. Finally, the separation of each DES, carried out using cation exchange columns and followed by FT-IR and 1H RMN.
El, Achkar Tracy. "Deep eutectic solvents : characterization, interaction with synthetic and biological membranes, and solubilization of bioactive volatile compounds." Thesis, Littoral, 2020. http://www.theses.fr/2020DUNK0562.
Повний текст джерелаDeep eutectic solvents (DES) recently emerged as a novel class of green solvents with a high potential to replace common organic solvents. Despite their novelty, DES were extensively explored in the past years owing to their remarkably interesting properties. Yet, a lot remains to be uncovered given the limitless number of possible DES and their versatility. The current sudy aimed to examine the effect of DES on liposomes, adopted as model membranes, and on cell membranes. It also sought to evaluate the solubilizing ability of DES toward bbioactive volatile compounds. Therefore, a group of selected DES along with new solvents were first prepared and characterized. Density, viscosity and polarity measurements were mainly carried out and showed that DES' properties can be tuned depending on their composition. The organization of phospholipids and liposomes within the DES was then investigated using optical- and atomical force microscopies. Phospholipids self-assembled into vesicles in choline chloride-based DES while liposomes converted to lipid bilayers before their reconstitution into vesicles. Moreover, cytotoxicity studies and morphological examinations were combined to evaluate the impact of some DES on MDA-MB-231, a human breast cancer cell line. Results showed that the effect is highly dependent on the DES' composition. On the other hand, the solubilizing ability of the DES toward bioactive volatile compounds was tested using static headspace-gas chromatography. The influence of the presence of water and some encapsulation systems such as liposomes and cyclodextrins on the overall DES' solubilization efficiency was further analyzed. At last, the release of trans-anethole from the DES was monitored via multiple headspace extraction. DES were able to greatly solubilize the bioactive volatile compounds and to control their release when compared with water. Altogether, this work highlights the potential use of the DES-based systems as solubilization vehicles for bioactive compounds
Couch, Erica Dawn. "Difluoroboronate Urea-Induced Acid Amplification for Insertion Chemistry." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1404225572.
Повний текст джерелаNaughton, Elise Michele. "Ru,Rh,Ru Supramolecular Photocatalysts within Nafion® Membranes: Ion-exchange, Photoelectrolysis and Electron Transfer Processes." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/70865.
Повний текст джерелаPh. D.
Kopesky, Paul Wayne. "Self-assembling peptide hydrogels promote in vitro chondrogenesis of bone marrow-derived stromal cells : effects of peptide sequence, cell donor age, and method of growth factor delivery." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/61225.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 108-115).
The inability of articular cartilage to heal after damage or disease has motivated investigation of novel cartilage tissue engineering technologies. The objective of this thesis was to advance the use of self-assembling peptide hydrogel scaffolds for cartilage repair by encapsulating bone-marrow-stromal cells (BMSCs) and incorporating chondrogenic cues to stimulate differentiation and neotissue production. To test the hypothesis that self-assembling peptide hydrogels provide cues which enhance the chondrogenic differentiation of BMSCs, a technique for rapid, high-viability BMSC encapsulation was developed. BMSCs were cultured in two peptide hydrogel sequences and compared to agarose hydrogels. BMSCs in all three hydrogels underwent TGF-3 1-mediated chondrogenesis as demonstrated by comparable gene expression and ECM biosynthesis. Cell proliferation occurred only in the peptide hydrogels, not in agarose, resulting in higher sulfated-glycosaminoglycan content and more spatially uniform proteoglycan and type II collagen deposition. These data showed that self-assembling peptide hydrogels enhance chondrogenesis compared to agarose. To evaluate the capacity for BMSCs from young and adult equine donors to produce cartilage-like ECM, neotissue formation was compared to that for animal-matched primary chondrocytes. Young chondrocytes stimulated by TGF-PlI accumulated ECM with higher sulfated-glycosaminoglycan content than adult chondrocytes and BMSCs of either age. BMSCs produced neotissue with higher dynamic stiffness than young chondrocytes. Measurement of aggrecan core-protein and chondroitin-sulfate length by atomic-force microscopy revealed BMSCs produce longer core protein and chondroitin-sulfate, and fewer catabolic-cleavage products than chondrocytes. Therefore, BMSC-produced aggrecan appears to have a younger phenotype than chondrocyte-produced aggrecan. These advantages make BMSCs a potentially superior cell source for peptide-hydrogel-based cartilage repair. To deliver TGF-pl to BMSCs via a bioactive scaffold, BMSCs were encapsulated in peptide hydrogels with both tethered and adsorbed TGF-p1 and cultured in TGF-p 1-free medium. Chondrogenesis was compared to that of unmodified peptide hydrogels with medium-delivered TGF-p1. Adsorbed-TGF-plI peptide hydrogels stimulated chondrogenesis of BMSCs as demonstrated by cell proliferation and cartilage-like ECM accumulation, while tethered TGF-p1 was not different from TGF-pl -free controls. TGF-p1 adsorbed to self-assembling peptide hydrogels can stimulate BMSC chondrogenesis. BMSC-seeded self-assembling peptide hydrogels, modified for controlled delivery of pro-chondrogenic factors, generate cartilage-like neotissue and are compatible with a single-surgery, autologous therapy for cartilage repair.
by Paul Wayne Kopesky.
Ph.D.
Kuo, Jonathan Lan. "Using First Row Transition Metal Hydrides as Hydrogen Atom Donors." Thesis, 2017. https://doi.org/10.7916/D8MG8226.
Повний текст джерелаLiu, 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.
Повний текст джерела國立高雄科技大學
化學工程與材料工程系
107
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 showed the best DC values than others. The DC values are in the order of 1:2 wt% > 1.5:1.5wt% > 2:1 wt% for weight ratios investigation of TX/TEOA PI packages. In addition, the DC values are insignificant in either air or nitrogen under TX/TEOA at 1:2 wt%. We also investigated their photochemical and photophysical properties. The hydrogen donors exhibited the absorption band at lower than 300 nm, which followed the trend p-TDEA > n-PDEA > NPG > TEOA > TEA. After mixing TX with various amine-type hydrogen donors, the PL intensity increased in the following order: TX/p-TDEA > TX/n-PDEA > TX/ NPG > TX/TEA > TX/TEOA. Based on the results of photochemical analysis, the measured molar extinction coefficient was TEA> TEOA> p-TDEA> n-PDEA> NPG. Though all the Type II series exhibited good electron transfer ability by cyclic voltammetry (CV) and free energy change ΔGET results. However, steric hindrance and secondary and tertiary of the amines hydrogen donors played the major factor on the rate of photopolymerization.
Jou, Leng-Long, and 周永隆. "Study of Hydrogen-Bonded Complexes Containing Coil-Coil Diblock Copolymer Donors and Light-Emitting Acceptors." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/68049243069315743018.
Повний текст джерелаZhang, Zhiyong. "Experimental Study of In-Situ Upgrading for Heavy Oil Using Hydrogen Donors and Catalyst under Steam Injection Condition." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9407.
Повний текст джерелаLu, Chia-Lin, and 呂佳霖. "Synthesis and Study of Hydrogen-Bonded Bent Core Liquid Crystals Containing a Bent-Core Pyridyl Acceptor and Various Siloxane Acid Donors." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/39489266351500133387.
Повний текст джерела國立交通大學
材料科學與工程學系
100
In order to study the influence of the structure of siloxane terminal group on the mesogenic behavior of hydrogen-bonded bent core liquid crystal, a series of hydrogen-bonded bent core liquid crystal containing a bent-core pyridyl acceptor and four siloxane acid donors liquid crystal compounds were synthesized. The chemical structures of these compounds were characterized by 1H-NMR, IR spectra, MS as well as elemental analyses, and the liquid crystalline phases and mesomorphic behavior of all the compounds were identified from the results of DSC, POM, electro-optical measurement and GISAXS. Only the compound of POSS8-NBF14 can’t exhibit any mesophases, the other all exhibit, S1-NBF14 is a hydrogen-bonded complex with a linear siloxane units exhibited a series of general tilt smectic (SmCG) phases with highly ordered layer structures. POSS1-NBF14 is a hydrogen-bonded complex with a huge siloxane units exhibited a general tilt smectic (SmCG) phases with highly ordered layer structures. C4-NBF14 is a hydrogen-bonded complex with a cyclic siloxane units exhibited a highly ordered layer structures.
Bakalarz, Dominik. "Molecular mechanisms of novel carbon monoxide and hydrogen sulfide donors activity enhancing physiological gastric mucosal integrity against acute drug-induced gastrotoxicity." Praca doktorska, 2021. https://ruj.uj.edu.pl/xmlui/handle/item/283680.
Повний текст джерелаBakalarz, Dominik. "Molecular mechanisms of novel carbon monoxide and hydrogen sulfide donors activity enhancing physiological gastric mucosal integrity against acute drug-induced gastrotoxicity." Praca doktorska, 2021. https://ruj.uj.edu.pl/xmlui/handle/item/288598.
Повний текст джерелаReshi, Noor U. Din. "Mechanistic Studies of Transfer Hydrogenation Catalyzed by Ru(ll)-Half-Sandwich and Group 6 NHC complexes." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5419.
Повний текст джерелаWolf, Inka M. [Verfasser]. "Metal containing and metal free organocatalysts: new design concepts for hydrogen bond donors and substrate activation = Metallhaltige und metallfreie Organokatalysatoren: Entwicklung von neuartigen Konzepten von wasserstoffbrücken Donoren und zur Substrat-Aktivierung / vorgelegt von Inka M. Wolf." 2010. http://d-nb.info/100061364X/34.
Повний текст джерелаMakgato, M. H. (Matlou Hector). "Effects of hydrogen donor additives on the coking properties of high-temperature coal extracts." Diss., 2008. http://hdl.handle.net/2263/27718.
Повний текст джерелаDissertation (MSc)--University of Pretoria, 2009.
Chemistry
unrestricted
Makgato, Matlou Hector. "Effects of hydrogen donor additives on the coking properties of high temperature coal extracts." 2008. http://upetd.up.ac.za/thesis/available/etd-02092009-125239.
Повний текст джерелаNebe, Thomas [Verfasser]. "Investigations on reactions of metal complexes with N-donor ligands towards hydrogen peroxide / vorgelegt von Thomas Nebe." 2010. http://d-nb.info/1002804426/34.
Повний текст джерелаHuang, Yi-Ying, and 黃怡螢. "Remote Control of Hydrogen Bond Strengths in Donor-bridge-Acceptor Systems: The Effects of Torsion and Metalation." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/97844119708803392267.
Повний текст джерела國立臺灣大學
化學研究所
93
Remote control of hydrogen bond strengths can be modulated in a three-component system consisting of a hydrogen bonding site (pyrrole), a conjugated bridge and a reaction center (imine). Protonation of the reaction center can trigger intramolecular charge transfer thus altering the binding ability of the remote hydrogen-bonding site. The signaltransduction from the reaction center to the hydrogen-bonding site can be easily observed. In the first part of the study, we investigated the effect of non-planarity in the π-conjugated system has on the binding strength in the three-component system. Computational study showed that the torsion angle between the binding site and the bridging unit could greatly influence the remote signal communication in our three-component system. Dihedral angle drive calculations on the hydrogen-bonding site were performed to show how the binding energies behaved as the torsion angle is varied. The results showed decay in the binding strength and transduction sensitivity as the torsion angle is increased. Small decrease in the binding energies is observed when the torsion angle is within 45°, so that intramolecular charge transfer is not seriously affected by small distortion in the torsion angle. When we compare the CH=CH bridge and N=N bridge, the N=N bridge, which displays more efficient charge-transfer ability than the CH=CH bridge in planar configuration, is less affected by the variation of the torsion angle, as long as the torsion angle is within 30°. In general, the decrease of binding energy in the α-systems is slightly more than the β-systems as the three-component systems become nonplanar. In the second part of the study, we observed the extent of charge transfer that was induced by metalation and compared it with protonation-induced charge transfer. We studied four three-component systems: system A (pure CH=CH-CH=CH bridge), system B (with two substituted CN groups in the CH=CH-CH=CH bridge), system C (with two substituted CN groups in the reaction center), and system D (with four substituted CN groups in the reaction center). The results showed that the abilities of charge transfer and sensitivity for metalation with M2+ ions are similar to protonation in all four systems. However, the abilities of charge transfer and sensitivity for metalation with M+ ions are very weak and are similar to the neutral state. The binding energies of different metals with the same oxidation state are similar (Ru2+ > Zn2+ = Mg2+ ; Li+ > Na+). The strengths of binding energies ordered from high to low observed in the four systems are system B > system D > system C > system A and sensitivities ordered from high to low in four systems are system D > system C > system B > system A. When we observed the bridge length effect on the four systems, the charge-transfer ability of system B is the least affected as the length of the bridge increase. Our studies have provided great insights in the understanding of remote hydrogen bond communication in our three-component systems and they could provide guidelines for the synthetic design of these materials.
Alshaiban, Ahmad. "Propylene Polymerization Using 4th Generation Ziegler-Natta Catalysts: Polymerization Kinetics and Polymer Microstructural Investigation." Thesis, 2011. http://hdl.handle.net/10012/6074.
Повний текст джерелаShih-Jung, Lo. "Control of Hydrogen Bond Strengths in Donor-Bridge-Acceptor Three-Component Systems: The Effects of Bridge Structures and Substituents." 2003. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0021-2603200719133129.
Повний текст джерелаLo, Shih-Jung, and 駱思融. "Control of Hydrogen Bond Strengths in Donor-Bridge-Acceptor Three-Component Systems: The Effects of Bridge Structures and Substituents." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/87668584466263343011.
Повний текст джерела國立臺灣師範大學
化學研究所
92
The importance of hydrogen bonding has prompted us to investigate systems in which the strengths of hydrogen bonds can be modulated at will by external stimuli. Three-component systems consisting of a hydrogen-bonding site (electron donor), a bridge, and a reaction center (electron acceptor) have been designed to achieve this goal of hydrogen-bonding modulation. When the reaction center was protonated, a signal was sent out to the other end of the three-component molecule via intramolecular charge transfer (ICT) and thus affected the binding ability of the binding site. It has been found that the constituents of the bridge greatly influence the efficiency of remote signal communication between the reaction and binding centers. In the current theoretical study, we focused on the carbon-based conjugated bridges and studied the effects of bridge structure and substituents on signal transduction. It was found that the quinoidal bridges or bridges with cyano substitutions near the reaction center were more effective than the parent unsubstituted transoid (CH=CH)3 bridge. For bridges such as (CR1=CR2)n or (CR1=CR1-CR2=CR2)n, signal reduction due to longer bridge lengths could be minimized if R2 are substituted with electron-withdrawing substituents such as F and CN. Finally, the (C(CN)=C(CN))n bridges are signal amplifying, i.e., longer bridge lengths cause stronger binding change at the binding site.
ZHOU, WU-GING, and 周武清. "The binding energy of hydrogenic donor impurity in GaAs-Ga1-x Alx As quantum well." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/77361655880450678926.
Повний текст джерелаChen, Wei-hao, and 陳韋豪. "Remote Control of Hydrogen Bond Strengths in Donor-Bridge-Acceptor Systems : The Effects of Metalation on Three-Component Porphyrin and Heteroporphyrin Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/99802500891688325236.
Повний текст джерела國立中央大學
化學研究所
97
Remote control of hydrogen bond strengths can be modulated in a three-component system containing a hydrogen bonding site(pyrrole),a conjugated bridge and a reaction center (porphyrin). Metalation of the reaction center can trigger intramolecular charge transfer(ICT), thus altering the binding ability of the remote hydrogen-bonding site. In our computational study, we have investigated two topics. The first one is to study the effect of metalation in the porphyrin three-component systems with different bridge positions. In this case, we have found that the porphyrin ring does not induce ICT in the metalated states, so we changed the reaction center to heteroporphyrins. Remote control of hydrogen bond strengths was successfully achieved with heteroporphyrins. The second topic is to construct two different types of multiple-way control systems which have multiple binding sites controlled by one metalation center. One has the similar binding strengths at all binding sites and the other has different binding strengths. We also compare the effectiveness of metalation in terms of remote control in single-way and multiple-way systems.
Mateshov, Dauren. "Experimental Study of In Situ Combustion with Decalin and Metallic Catalyst." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8722.
Повний текст джерела