Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 156 for “"thiophene"”.
-
Thiophene-based photoresponsive mesogens
… structure-property relationships of a variety of thiophene-containing azobenzene esters derived from either 3-(2-thienyl)acrylic acid (Series I, IV, VI, VIII, X and XII) or 3-(3-thienyl)acrylic acid (Series II, V, VII, IX, XI and XIII) and appropriate fluoro- and non-fluoro-substituted …
-
Thiophene Based Semiconductors: Synthesis and Characterizations
… of regioregular head-to-tail polyhexylthiophene in different environments have been studied by means of AFM and UV-vis spectroscopy. A helical conformation of the main chain with 12 thiophenes rings per each helical turn has been proposed. Length of the particles varies from several …
-
Thiophene derivatives of rhenium and titanium
… of high oxidation state metal-oxo derivatives of thiophene, (ii) the exploration of the reactivity of the carbon-sulfur bond in condensed thiophenes, and (iii) the discovery of a new polymerization technique for the preparation of polythiophenes.
-
The addition of oxygen to coordinated thiophene
… = $\eta\sp5$-C$\sb5$Me$\sb5$, TMT = tetramethylthiophene) can be reduced with two electrons to give the novel compound Cp*Rh(TMT), which features an $\eta\sp4$-bound tetramethylthiophene ligand with the sulfur atom oriented away from the metal center. The thiophenic sulfur atom in this complex …
-
Transition Metal Complexes With Hydrosulfido and Thiophene Ligands
The removal of thiophenes and dibenzothiophenes from petroleum by catalytic hydrodesulfurization is becoming increasingly important to fossil fuel processing. The reaction mechanism of this process is proposed to involve thiophene coordination to the metal surface and subsequent hydrogen transfer …
-
Thiophene and Derivatives for Use in Pyridazines and Thiapentalenes
… and advantages that heterocycles, particularly thiophene and thiophene derivative complexes, and cyclopenta[c]thiophenes offer in the manufacturing of organic semiconductors. One area of thiophene research that has showed promise in leading to mass production of semiconductors derived from …
-
Chemistry of Ruthenium and Rhodium Eta(4)-Thiophene Complexes
Reduction of ($(\eta\sp6$-$\rm C\sb6Me\sb6)Ru(\eta\sp5$-C$\sb4$R$\sb4$S)) (OTf)$\sb2$(C$\sb4$R$\sb4$S = C$\sb4$H$\sb4$S (1a), 2,5-Me$\sb2$C$\sb4$H$\sb2$S (1b), and 2,3,4,5-Me$\sb4$C$\sb4$S (1c)) and (($\eta\sp5$-C$\sb4$Me$\sb4$S)$\sb2$Ru) (OTf)$\sb2$ (1d) with Cp$\sb2$Co produces …
-
Synthesis, multiscale-multiphase characterization and applications of thiophene-based biohybrids
… the bio component. So far, very few examples of thiophene-based biohybrids have been reported. The aim of this Ph. D thesis has been the development of oligothiophene-oligonucleotide hybrid derivatives as tools, on one side, to detect DNA hybridisation events and, on the other, as model compounds …
-
The preparation of polynuclear compounds containing the thiophene ring system
… this research was to extend this process to the thiophene series, in addition to continuing some work on the 9-(dimethyl)- phenylanthracene series and some newly developed l,2-dimethyl-10-phenyl)-anthracene series. 2'-Thienyl-2-benzylbenzophenone was prepared and cyclized to …
-
The Physical and Spectroscopic Study of a Series of Poly(3-hexyl thiophene) Homopolymers and Poly(3-hexyl thiophene)-block-Poly(2-hydroxyethyl methacrylate) Diblock Copolymers
… fundamental physical properties of poly(3-hexyl thiophene) (P3HT) were studied. Five P3HT samples with different molecular weights were used. We have determined the relationship between physical and spectral properties of this polymer and its molecular weight. In particular, we have found that …
-
The Adsorption of Nitric Oxide and Thiophene on Platinum Single Crystals
The adsorption of nitric oxide on Pt(210), Pt(100), and Pt(111) was studied using X-ray photoelectron (XPS) and Auger electron (AES) spectroscopies. Nitric oxide was found to molecularly adsorb on Pt(210) at room temperature but to dissociate upon heating to 450 K. The same behavior was noted on …
-
Cyclopentadienyl ruthenium sulfide carbonyls and thiophene activation by iron and rhodium
The desulfurization and reduction of the sulfur-containing organic compounds in petroleum products is the objective of catalytic hydrodesulfurization (HDS), one of the largest applications of transition-metal catalysis. However, the specific mechanism for the process is not well understood. This …
-
The hydrodesulfurization of thiophene by Mo/Co treated oxyaluminum pillared montmorillonites
The purpose of this study was to investigate the synthesis and properties of oxyaluminum pillared montmorillonites prepared using the controlled hydrolysis of aluminum isopropoxide as the source of pillaring species and to evaluate pillared montmorillonites as supports for hydrodesulfurization …
-
Morphology, charge transport properties, and molecular doping of thiophene-based organic semiconducting thin films
… on understanding how the charge transport in thiophene-based semiconductor layers depends on the layer morphology and how the charge transport properties can be intentionally modified by doping these layers with a strong electron acceptor. By means of optical spectroscopy, the layer …
-
Kinetics and interactions of the simultaneous catalytic hydrodenitrogenation of pyridine and hydrodesulfurization of thiophene
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Chemical Engineering.
-
Reaction mechanism of solvated n-BuLi with thiophene in THF: A theoretical and spectroscopic study
… with mono-halogenated (bromine and chlorine) thiophene in THF. The reaction analysis yielded full characterisation of the reaction energy profiles and stationary points for over twenty unique chemical reaction systems. The reaction study shows that the mechanism for which lithium�halogen …
-
Adsorption and reaction kinetics of thiophene in n-pentane in a batch recirculated catalytic reactor
Includes bibliographical references (pages 129-141).
Page 1 of 8