To see the other types of publications on this topic, follow the link: Thiophene synthesis.
Dissertations / Theses on the topic 'Thiophene synthesis'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Thiophene synthesis.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Kiriy, Nataliya. "Thiophene Based Semiconductors: Synthesis and Characterizations." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1141840200043-85237.
Full textAbstract:
Diverse conformational transitions and aggregations 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 nanometers to several hundreds nanometers and can be adjusted by the solvents composition or concentration of PATs. Such well-defined organic semiconductor 1D particles can be used as building blocks for future nanoscale and molecular level electronic devices. Oligothiophenes represent one of the most promising class of semiconductive materials for FET fabrication because of their good mobility and environmental stability. However, most of unsubstituted oligothiophenes are insoluble that suppresses their potential industrial utility. On the first stage of the work, conformation, crystalline structure, molecular packing and charge carrier mobility of the highly soluble regiochemically pure [Beta]-substituted sexithiophene were systematically studied. It was found that [Beta, Beta´]-DH6T possesses moderate PR-TRMC charge carrier mobility, but rather low field-effect mobility. The investigation showed that such a poor macroscopic electrical properties of [Beta, Beta´]-DH6T originate neither from the twist of the conjugated system nor from the crystalline disorder, but rather from low-dense crystalline packing and "wrong" molecular orientation. To overcome these obstacles two thiophene-based azomethines were designed to optimize a solubility, self-assembly, and a charge carrier mobility. The idea was to utilize the ability of the amide group to form strong hydrogen bonds in non-polar solvents and in solid state, but to be easily broken in presence of polar solvents. Thus, at the stage of a dissolution and a deposition, when the solubility is important, the hydrogen bonding can be "switched off" simply by addition of polar solvents and then, after the removal of polar additives, the self-assembly can be "switched on". It was found that incorporation of azomethine and amide moieties in the [Alpha, Omega]-position, and hexyl chains in [Beta]-position of quaterthiophene, indeed considerably improves the self-assembly properties without suppression of the solubility. Self-assembly of azomethine oligomers with (QT-amide) and without amide moieties (QT-aniline) were monitored by UV-vis, XRD, and AFM. It was found that QT-amide, processed from solution, forms highly ordered layered (terrace) structures. This aggregation mode is similar to the self-assembly of unsubstituted conjugated oligomers (such as pentacene) occurred upon their evaporation in vacuum. The sum of charge carrier mobilities (PR-TRMC data) for QT-aniline was shown to be below the detectable limit, but the mobility of QT-amide was determined to be 1.10-2 cm2 V-1 s-1. The later is comparable with the mobilities of the best organic semiconductors. All these significant differences in properties of related compounds can be attributed to the hydrogen bonding between QT-amide molecules responsible for the observed self-assembly.
2
Kiriy, Nataliya. "Thiophene Based Semiconductors: Synthesis and Characterizations." Doctoral thesis, Technische Universität Dresden, 2005. https://tud.qucosa.de/id/qucosa%3A24675.
Full textAbstract:
Diverse conformational transitions and aggregations 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 nanometers to several hundreds nanometers and can be adjusted by the solvents composition or concentration of PATs. Such well-defined organic semiconductor 1D particles can be used as building blocks for future nanoscale and molecular level electronic devices. Oligothiophenes represent one of the most promising class of semiconductive materials for FET fabrication because of their good mobility and environmental stability. However, most of unsubstituted oligothiophenes are insoluble that suppresses their potential industrial utility. On the first stage of the work, conformation, crystalline structure, molecular packing and charge carrier mobility of the highly soluble regiochemically pure [Beta]-substituted sexithiophene were systematically studied. It was found that [Beta, Beta´]-DH6T possesses moderate PR-TRMC charge carrier mobility, but rather low field-effect mobility. The investigation showed that such a poor macroscopic electrical properties of [Beta, Beta´]-DH6T originate neither from the twist of the conjugated system nor from the crystalline disorder, but rather from low-dense crystalline packing and "wrong" molecular orientation. To overcome these obstacles two thiophene-based azomethines were designed to optimize a solubility, self-assembly, and a charge carrier mobility. The idea was to utilize the ability of the amide group to form strong hydrogen bonds in non-polar solvents and in solid state, but to be easily broken in presence of polar solvents. Thus, at the stage of a dissolution and a deposition, when the solubility is important, the hydrogen bonding can be "switched off" simply by addition of polar solvents and then, after the removal of polar additives, the self-assembly can be "switched on". It was found that incorporation of azomethine and amide moieties in the [Alpha, Omega]-position, and hexyl chains in [Beta]-position of quaterthiophene, indeed considerably improves the self-assembly properties without suppression of the solubility. Self-assembly of azomethine oligomers with (QT-amide) and without amide moieties (QT-aniline) were monitored by UV-vis, XRD, and AFM. It was found that QT-amide, processed from solution, forms highly ordered layered (terrace) structures. This aggregation mode is similar to the self-assembly of unsubstituted conjugated oligomers (such as pentacene) occurred upon their evaporation in vacuum. The sum of charge carrier mobilities (PR-TRMC data) for QT-aniline was shown to be below the detectable limit, but the mobility of QT-amide was determined to be 1.10-2 cm2 V-1 s-1. The later is comparable with the mobilities of the best organic semiconductors. All these significant differences in properties of related compounds can be attributed to the hydrogen bonding between QT-amide molecules responsible for the observed self-assembly.
3
Unur, Ece. "Synthesis Of Thiophene Capped Polytetrahydrofuran Conducting Copolymers." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1144625/index.pdf.
Full textAbstract:
Living polytetrahydrofuran (PTHF) was terminated with sodium thiophenemethonate to yield a polymer with thiophene groups at one (PTHF1) and both ends (PTHF2). Copolymerizations of PTHF1 and PTHF2 insulating polymers with pyrrole and thiophene were achieved in water-p-toluene sulfonic acid (PTSA) and acetonitrile (AN)-tetrabutylammonium tetrafluoroborate (TBAFB) solvent-electrolyte couples via constant potential electrolysis. Characterization of the samples were performed by Nuclear Magnetic Resonance Spectroscopy (NMR), cyclic voltammetry (CV), Fourier Transform Infrared Spectroscopy (FT-IR), Thermal Analyses (TGA), (DSC) and Scanning Electron Microscopy (SEM). Electrical conductivities were measured by four-probe technique. PTHF1/PTh and PTHF2/PTh films which were deposited on ITO-glass in dichloromethane-TBAFB solvent-electrolyte couple found out to be anodically coloring copolymers that electrochemically switch between an oxidized blue and reduced red state exhibiting electrochromic behavior. Spectroelectrochemical Analysis (SEC) was run in UV-VIS region to reach a better understanding of the band structures of PTHF1/PTh and PTHF2/PTh electrochromic copolymers. Optoelectrochemical analyses were introduced as a new method for the characterization of copolymers.
4
Landman, Marile. "Synthesis of metal complexes with thiophene ligands." Thesis, Access to E-Thesis, 2000. http://upetd.up.ac.za/thesis/available/etd-12042006-143722/.
Full text
5
Sousa, Paula T. de. "The synthesis of novel thiophene analogues of leukotrienes." Thesis, University of East Anglia, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317613.
Full text
6
Gledhill, Adrian Paul. "Synthesis of polysubstituted fatty acids via thiophene intermediates." Thesis, Nottingham Trent University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304892.
Full text
7
Weddell, Derek Alexander. "Synthesis, structure determination and mechanism in thiophene derivatives." Thesis, Nottingham Trent University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343542.
Full text
8
Van, Jaarsveld Nina Alletta. "Synthesis and structure of modified thiophene biscarbene complexes." Diss., University of Pretoria, 2010. http://hdl.handle.net/2263/23311.
Full text
9
Waugaman, Marlene. "Synthesis and characterization of 3-[Oligo(dimethylsiloxane] thiophene macromonomers." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1998. http://digitalcommons.auctr.edu/dissertations/1293.
Full textAbstract:
Electronic conductive polymers such as polyacetylenes, polyanilines and polythiophenes, are not easy to process due to lack of tractability and solubility. Chemical modifications of the polythiophenes backbone have been utilized to improve the processibility.
Our goal is to synthesize and characterize 3-[oligo(dimethylsiloxane)]- thiophene macromonomers as precursors for potentially processible, conductive derivatives of polythiophene. The precursor will be used in the preparation of various poly {[3- oligo(dimethylsiloxane)]thiophene-co-3-methylthiophene} random copolymers. By increasing the chain length of the low glass transition (Tg) side chain, we hope to produce processible elastomeric material.
w-(Si-H)-DMS, 3-propenylthiophene (i.e. precursors for the macromonomers), and the macromonomer were characterized (as appropriate) by 'HNMR, SiNMR, C NMR, DSC, IR, UV-VIS, GPC, and GC-MS.
10
Thatti, Ravtej Singh. "The synthesis and properties of phenyl-cored thiophene dendrimers." Thesis, Kingston University, 2016. http://eprints.kingston.ac.uk/37349/.
Full textAbstract:
Dendrimers are globular macromolecules that have a range of applications. These nonnally exploit the individual prope1ties of the functional groups that make up the overall dendrimer. The polyvalent properties of dendrimers are widely used in biomedical scaffolds and catalysis. The internal cavities with the structure can also be harnessed for encapsulation. This application has evoked interest especially within the bio-medical field, using dendrimers as host molecules to increase the solubility of drug molecules. In this research, a set of dendrimers were prepared to test the potential of encapsulation and manipulation of the host structure. The dendrimer products contained thiophene spacer groups and a thiophene outer shell, with alkylated terminal groups. The hetcro aromatic rings were held around a phenyl core and internal generations to create the cavity space. After the phenyl-cored thiophene dendrimers were fully characterised, iodoform was used as a guest molecule and incorporated into the dendrimer structure to fonn an encapsulation complex. At this point it was seen that the second dendrimer had the potential to encapsulate and hold iodoform within its internal structure. UV-visible spectroscopy was used to verify how the presence and the overall amount of encapsulated iodofonn. Following these results a microgravimetric study was carried out, and it confinned the ratio of dendrimer to iodof01m (I :2.76). A minimised (MM3) molecular model of each of the dendrimers indicated that there was a possible van der Waals interaction between the thiophene moieties of the dendrimer and iodoform and confirmed that the second dendrimer was more likely to be efficient in encapsulating the guest molecule. Fmther molecular modelling showed that a four branched dendron was likely to increase the encapsulation potential. The dendrimers were exposed to iodine vapour to study the effect of doping. This was followed by UV-visible spectrometry, but data were mainly collected and compared by electrical conductivity measurements. It was shown that the dendrimer which contained a larger number of conjugated thiophene rings was much more conductive. The calculated charge carrier mobilities and conductivities were relatively low compared to those of large thiophene oligomers or polythiophene. This was expected as the charge had to hop frequently between dendrimer molecules compared to a single polymer. It was predicted that after encapsulation, the oxidised dendrimer complex would be affected by some torsion of the bond between the thiophene rings. Cyclic voltammetry for the second dendrimer displayed peaks for both n- and p-type doping. From this, the electrochemical band gap was calculated and compared to the optical band gap obtained from the UV-visible spectrum. The values were 2.6 ±0.1 eV.
11
Sharma, Sanjay. "The synthesis and characterisation of pyramidine-thiophene containing liquid crystals." Thesis, University of Hull, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272086.
Full text
12
Grover, Chrissie. "The synthesis and characterisation of chiral thiophene-based liquid crystals." Thesis, Nottingham Trent University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310850.
Full text
13
Alesi, Silvia <1980>. "Synthesis, multiscale-multiphase characterization and applications of thiophene-based biohybrids." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/1046/.
Full textAbstract:
Biohybrid derivatives of π-conjugated materials are emerging as powerful tools to study biological events through the (opto)electronic variations of the π-conjugated moieties, as well as to direct and govern the self-assembly properties of the organic materials through the organization principles of 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 to investigate thiophene-nucleobase interactions in the solid state.
To obtain oligothiophene bioconjugates with the required high level of purity, we first developed new synthetic ecofriendly protocols for the synthesis of thiophene oligomers. Our innovative heterogeneous Suzuki coupling methodology, carried out in EtOH/water or isopropanol under microwave irradiation, allowed us to obtain alkyl substituted oligothiophenes and thiophene based co-oligomers in high yields and very short reaction times, free from residual metals and with improved film forming properties. These methodologies were subsequently applied in the synthesis of oligothiophene-oligonucleotide conjugates.
Oligothiophene-5-labeled deoxyuridines were synthesized and incorporated into 19-meric oligonucletide sequences. We showed that the oligothiophene-labeled oligonucletide sequences obtained can be used as probes to detect a single nucleotide polymorphism (SNP) in complementary DNA target sequences. In fact, all the probes showed marked variations in emission intensity upon hybridization with a complementary target sequence. The observed variations in emitted light were comparable or even superior to those reported in similar studies, showing that the biohybrids can potentially be useful to develop biosensors for the detection of DNA mismatches.
Finally, water-soluble, photoluminescent and electroactive dinucleotide-hybrid derivatives of quaterthiophene and quinquethiophene were synthesized. By means of a combination of spectroscopy and microscopy techniques, electrical characterizations, microfluidic measurements and theoretical calculations, we were able to demonstrate that the self-assembly modalities of the biohybrids in thin films are driven by the interplay of intra and intermolecular interactions in which the π-stacking between the oligothiophene and nucleotide bases plays a major role.
14
Jonathan, Tietz I. "Thienothiophene-Based Liquid Crystals: Synthesis and Comparative Evaluation of Mesophase Properties." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1343074444.
Full text
15
Wang, Zegao, Pingjian Li, Yuanfu Chen, Jiarui He, Wanli Zhang, Oliver G. Schmidt, and Yanrong Li. "Pure thiophene–sulfur doped reduced graphene oxide: synthesis, structure, and electrical properties." Royal Society of Chemistry, 2014. https://tud.qucosa.de/id/qucosa%3A36294.
Full textAbstract:
Here we propose, for the first time, a new and green ethanol-thermal reaction method to synthesize highquality and pure thiophene–sulfur doped reduced graphene oxide (rGO), which establishes an excellent platform for studying sulfur (S) doping effects on the physical/chemical properties of this material. We have quantitatively demonstrated that the conductivity enhancement of thiophene–S doped rGO is not only caused by the more effective reduction induced by S doping, but also by the doped S atoms, themselves. Furthermore, we demonstrate that the S doping is more effective in enhancing conductivity of rGO than nitrogen (N) doping due to its stronger electron donor ability. Finally, the dye-sensitized solar cell (DSCC) employing the S-doped rGO/TiO₂ photoanode exhibits much better performance than undoped rGO/TiO₂, N-doped rGO/TiO₂ and TiO₂ photoanodes. It therefore seems promising for thiophene–S doped rGO to be widely used in electronic and optoelectronic devices.
16
Tirkes, Seha. "Synthesis, Characterization, And Polymerization Of Polyether Bridged Thiophene And Aniline Derivatives." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609399/index.pdf.
Full textAbstract:
New compounds consisting of 3-thienyl and aniline units linked by polyether bridges have been synthesized and their electrochemical polymerization was performed via constant potential electrolysis and cyclic voltammetry. In the case of 3-thienyl derivatives two compounds, 1,12-di-3-thienyl-2,5,8,11-tetraoxadodecane (MI) and 1,15-di-3-thienyl-2,5,8,11,14-pentaoxapentadecane (MII) were synthesized utilizing literature methods and their corresponding polymers, poly(I) and poly(II) were prepared in an electrolytic solution containing 0.1 M terabutylammonium hexafluorophosphate (TBAPF6) dissolved in CH3CN. On the other hand, polymerization of aniline derivatives, 2,2'-[ethane-1,2-diylbis(oxyethane-2,1-diyloxy)]dianiline (MIII) and 2,2'
-[oxybis(ethane-2,1-diyloxyethane-2,1-diyloxy)]dianiline (MIV), was achieved in an aqueous solution containing 3.0 mol.L-1 H2SO4. Spectroelectrochemical (SPEL) properties and thermal analysis of the resulting polymers have been investigated using UV-vis, and Thermogravimetric Analysis (TGA). MIII was also polymerized via chemical oxidation for comparison purposes. The polymers were characterized using 1H-NMR and FT-IR spectroscopic techniques. Furthermore, copolymers of MIII and MIV with aniline (ANI) were also studied with cyclic voltammetry (CV). SPEL behavior and electrical conduction mechanism of resulting copolymers were investigated using UV-vis spectroscopic technique and four-point probe technique, respectively.
17
McDonald, Robert Andrew. "Synthesis and characterization of chiral liquid crystals incorporating pyrimidine/thiophene moieties." Thesis, University of Hull, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445723.
Full text
18
Koo, Yiu, and 顧耀. "Synthesis of metal-containing thiophene-based conjugated polymers for photovoltaic applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B41897262.
Full text
19
Butcher, Jane Lesley. "Structural studies and synthesis of mesomorphic esters containing the thiophene nucleus." Thesis, Nottingham Trent University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293852.
Full text
20
Koo, Yiu. "Synthesis of metal-containing thiophene-based conjugated polymers for photovoltaic applications." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B41897262.
Full text
21
Asil, Demet. "A Glow In The Dark: Synthesis And Electropolymerization Of Chemiluminescent Thiophene Derivatives." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609863/index.pdf.
Full textAbstract:
ABSTRACT
A GLOW IN THE DARK:
SYNTHESIS AND ELECTROPOLYMERIZATION OF CHEMILUMINESCENT THIOPHENE DERIVATIVES
Asil, Demet
M.Sc., Department of Chemistry
Supervisor : Prof. Dr. Ahmet M. Önal Co-Supervisor: Assist. Prof. Dr. Atilla Cihaner September 2008, 63 Pages Two novel chemiluminescent monomers, 2,3-dihydrothieno(3,4-d)pyridazine-1,4-dione (T-Lum) and 5,7-di-thiophen-2-yl-2,3-dihydro-thieno[3,4-d]pyridazine-1,4-dione (TTT-Lum), were synthesized. The reaction between T-Lum and TTT-Lum in alkaline solution with H2O2 gave chemiluminescence which can be catalyzed using Fe(III) ion. Owing to its sensitivitiy towards Fe(III) ion
T-Lum and TTT-Lum can be promising materials to detect bloodstains in the application of forensic science instead of luminol which gave response to a large family of metallic cations beside Fe(III). Also, TTT-Lum, which is based on a terthienyl system, was electropolymerized and its corresponding polymer (PTTT-Lum) was obtained via repetitive cycling or constant potential electrolysis in both 0.1 M LiClO4 dissolved in acetonitrile containing 5% of BF3-Et2O by volume and neat BF3- Et2O solution. In addition, PTTT-Lum, soluble in alkaline water, was synthesized successfully without breaking the pyridazinedione unit (chemiluminescent unit), as proved by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and Electrochemical Luminescence (ECL) measurements. Thus, PTTT-Lum, bearing chemiluminescent unit, can be a good candidate to be used as a sensor in near future. Furthermore, the PTTT-Lum film has a very stable and well-defined reversible redox couple as well as electrochromic behavior during p-doping process. The polymer film has also a band gap of 1.74 eV with an absorption band in its neutral state at 536 nm. Finally, PTTT-Lum film was found to be electrochemiluminescence active, maintaining its activitiy over 1000 cycles.
22
Roudini, Danesh. "Synthesis and properties of novel thiophene-based liquid crystalline conducting polymers (LCCPs)." Thesis, Kingston University, 2015. http://eprints.kingston.ac.uk/33957/.
Full textAbstract:
Side chain liquid crystalline polythiophenes have been synthesised and investigated in order to study the effects of liquid crystalline moieties on the polymer and their possible effect on the electronic properties. Initially some mesogenic groups with a structure of two benzene rings were synthesised as the rigid core of the mesogen. This synthesis was followed by the attachment of mesogens through a six-methylene unit spacer to 3-thiophene methanol and the preparation of thiophene-based monomers. The chemical structure of the prepared monomers was confirmed by characterisation techniques such as NMR, GCMS and ATR etc. The investigation of the liquid crystalline behaviour of the monomers was carried out by polarised hot-stage optical microscopy (HSM), differential scanning calorimetry (DSC) and X-Ray diffractometry (XRD) The resulting monomers were polymerised chemically into the form of powders in order to measure their conductivity. A thin film of polymers was prepared on silicon and ITO glass substrate. The liquid crystalline properties of the polymer films were studied using DSC and HSM. XRD was used to investigate the effect of a magnetic field on the monomers and polymers. Polymerisation and electroactivity of monomers were studied on an ITO glass substrate by cyclic voltammetry technique. Polymers were modelled using Quantum Cache (Scigress) to predict their geometry and the calculated molecular dimensions were compared with the results of the X-ray diffraction analysis.
23
Shareef, Abdur-Rafay. "Synthesis Of Potential Anti-Leishmania Dicationic Diaryldiamidines." Digital Archive @ GSU, 2005. http://digitalarchive.gsu.edu/chemistry_theses/25.
Full textAbstract:
Dicationic diamidines synthesized in the Boykin group a have shown broad range of activity against a wide variety of microbial pathogens such as Cryptosporidium parvum, Leishmania donovani, Plasmodium falciparum, Trypanosoma burcei, and Trichomonas vaginalis. Thiophene based dicationic diamidines have been especially impressive versus Trichomoniasis, and several species of the leishmania parasite. The best compound in vitro against leishmania was 2,5-bis-(4-amidophenyl)thiophene [DB 351]. In an attempt to improve upon antileishmanial activity, several analogs of DB 351 have been synthesized. Previously the central heterocyclic ring has been changed (furan, pyrrole, etc.), and the phenyl has been substituted with a pyridine ring, however, in the thiophene series, the 3 and 4 position of the central thiophene ring has remained unmodified. By modifying the 3 and 4 position of the thiophene ring, and taking advantage of the substituent effect, the pharmacodynamic and distribution properties of DB 351 will altered; hopefully leading to more potent antileishmanial compounds.
24
Shareef, Abdur-Rafay. "Synthesis Of Potential Anti-Leishmania Dicationic Diaryldiamidines." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/chemistry_theses/3.
Full textAbstract:
Dicationic diamidines synthesized in the Boykin group a have shown broad range of activity against a wide variety of microbial pathogens such as Cryptosporidium parvum, Leishmania donovani, Plasmodium falciparum, Trypanosoma burcei, and Trichomonas vaginalis. Thiophene based dicationic diamidines have been especially impressive versus Trichomoniasis, and several species of the leishmania parasite. The best compound in vitro against leishmania was 2,5-bis-(4-amidophenyl)thiophene [DB 351]. In an attempt to improve upon antileishmanial activity, several analogs of DB 351 have been synthesized. Previously the central heterocyclic ring has been changed (furan, pyrrole, etc.), and the phenyl has been substituted with a pyridine ring, however, in the thiophene series, the 3 and 4 position of the central thiophene ring has remained unmodified. By modifying the 3 and 4 position of the thiophene ring, and taking advantage of the substituent effect, the pharmacodynamic and distribution properties of DB 351 will altered; hopefully leading to more potent antileishmanial compounds.
25
Konkol, Kristine Louise. "Synthesis and Design of Thiophene Materials: Effects of Ring Fusion and Metal Coordination." Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/31608.
Full textAbstract:
Conjugated organic materials comprise a field of materials chemistry focused on the development of semiconducting organic plastics, popular applications of which are plastic solar cells and display technologies. One of the reasons these materials have gained so much attention is that their optical and electronic properties can be tuned through engineering at the molecular level. Thiophene, an aromatic heterocycle, is a popular building block in the synthesis of many conjugated materials, prized for both the ease in which it can be synthetically functionalized and its ability to form highly conductive and low band gap materials.
The Rasmussen group has previously reported on the generation of two classes of materials, the inorganic metal thiophenedithiolenes and the fused-ring heterocycle unit thieno[3,4-b]pyrazine (TP), both of which have applications in conducting materials. In an effort to expand upon the applicability and versatility of these materials, a series of interconnected projects were performed to further tune their optical, electronic, and physical (e.g. solubility) properties. This involved synthetic molecular design, including judicious consideration of structure-function relationships, and characterization of the resulting materials. Highlights include a sterics vs. electronics consideration of the catalyzed hydrodebromination of the molecular building-block 2,3,5-tribromothiophene, variation of the coordinating metal in thiophenedithiolenes to tune the optics and electronics, and characterization of the effects of ring-fusion on TP-based terthienyl homopolymers. Additionally, a new application of the TP monomer was found, whereby it was successfully incorporated as a bridging ligand into a multi-metallic Ru(II) supramolecular assembly, which demonstrated good metal-metal communication.
26
Smith, Kevin Adam. "The synthesis and reactions of thieno[3,2-b]- and thieno[2,3-b]-thiophene." Thesis, University of Salford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245058.
Full text
27
Yigitsoy, Basak. "Synthesis Of A New Thiophene Derivative And Its Uses As An Electrochromic Device Component." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607305/index.pdf.
Full textAbstract:
2,5-Di(thiophen-2-yl)-1-p-tolyl-1H-pyrrole (DTTP) was synthesized via reaction of 1,4-di(2-thienyl)-1,4-butanedione with p-toluidine in the presence of catalytical amount of p-toluenesulfonic acid (PTSA). Homopolymer P(DTTP) was achieved both by chemical and electrochemical techniques. Chemical polymerization of the monomer yielded a soluble polymer. The average molecular weight was determined by gel permeation chromatography (GPC) as Mn: 2.5x103 g/mol. The monomer was electrochemically polymerized in the presence of LiClO4, NaClO4 (1:1) as the supporting electrolyte in acetonitrile. Copolymer of DTTP in the presence of EDOT was synthesized via potentiodynamic method in ACN/ NaClO4/LiClO4 (0.1 M) solvent-electrolyte couple. Structural characterizations of samples were carried out via 1H, 13C Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared Spectroscopy (FTIR). Electrochemical behaviors of monomer and polymers were determined by Cyclic Voltammetry (CV). The morphologies of the polymer films were examined by Scanning Electron Microscopy (SEM). Conductivities of the films were measured by four probe technique. Electrochromic and spectroelectrochemical behavior of the polymers coated on ITO glass electrode were investigated, and their ability of employment in device construction was examined. Spectroelectrochemistry analysis of P(DTTP) revealed an electronic transition at 428 nm corresponding to п
&
#8211
&
#1087
* transition with a band gap of 2.1 eV whereas P(DTTP-co-EDOT) revealed an electronic transition at 448 nm corresponding to &
#1087
- &
#1087
* transition with a band gap of 1.8 eV. Electrochromic investigations showed that P(DTTP) switches between greenish yellow and blue while P(DTTP-co-EDOT) was found to be multichromic, switching between red, yellow and blue. Switching time of the polymers was evaluated by a kinetic study upon measuring the percent transmittance (%T) at the maximum contrast point. Dual type polymer electrochromic devices (ECDs) based on P(DTTP) and P(DTTP-co-EDOT) with poly(3,4-ethylenedioxythiophene) (PEDOT) were constructed. Spectroelectrochemistry, electrochromic switching and open circuit stability of the devices were studied. They were found to have good switching times, reasonable contrasts and optical memories.
28
Mc, Sherry Ian. "The synthesis and mesophase behaviour of some chiral heterocyclic mesogens containing the thiophene nucleus." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308311.
Full text
29
Niebel, Claude, Yeongin Kim, Christian Ruzié, Jolanta Karpinska, Basab Chattopadhyay, Guillaume Schweicher, Audrey Richard, et al. "Thienoacene dimers based on the thieno[3,2-b] thiophene moiety: synthesis, characterization and electronic properties." Royal Society of Chemistry, 2015. https://tud.qucosa.de/id/qucosa%3A36261.
Full textAbstract:
Two thienoacene dimers based on the thieno[3,2-b]thiophene moiety were efficiently synthesized, characterized and evaluated as active hole-transporting layers in organic thin-film field-effect transistors. Both compounds behaved as active p-channel organic semi-conductors showing averaged hole mobility of up to 1.33 cm² V⁻¹ s⁻¹.
30
Gunatunga, Sumudu Rupika. "Synthesis and characterisation of 3-alkyl substituted 2,5-thiophene oligomers as models for poly(alkylthiophene)s." Thesis, University of Sussex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262663.
Full text
31
Grieb, Arthur L. "Synthesis and characterization of Ir(III) metallacycles derived from thiophene and related compounds : models for the hydrodesulfurization process /." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09292009-020335/.
Full text
32
Santos-Perez, Javier. "Synthesis and characterization of a new class of thiophene containing imidazoles as fluorescent and nonlinear optical materials." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2004. http://digitalcommons.auctr.edu/dissertations/2382.
Full textAbstract:
Photoresponsive molecules have a broad range of potential applications, for example in optical, energy, and biomedical technologies. Fluorophores and second order nonlinear optical (NLO) chromophores are photoresponsive molecules used as signaling materials and frequency doublers or electro-optical modulators, respectively.
The research presented here describes the synthesis, characterization, and potential applications of a group of highly fluorescent molecules and NLO chromophores containing benzene, imidazole and thiophene rings. Methyl, methoxy, and dimethylamino groups were used as electron donor groups while formyl and nitro groups were used as electron acceptors.
The fluorescence properties of a series of dyes containing donor groups and a formyl group attached to a thiophenyl ring were investigated. X-ray structural determination revealed a steric crowding, which causes a molecular twist in the ground state. The fluorescence quantum yield for these fluorophores was found in the range of0.004-1.0. It was determined that these fluorescent molecules emit light from a non-polar locally excited (LE) state and a polar intramolecular charge transfer (ICT) excited state. The dye containing the dimethylamino group was characterized by dual fluorescence in moderate polar solvents. The excited state dipole moments and excited state lifetimes were found to increase as the strength of the donor group increases. A linear correlation was obtained for the Stokes shift versus the solvent polarity parameter ET(30) and the Hammett's constant σ+. Solvatochromic studies revealed a solvent polarity dependence on fluorescence properties.
Macromolecules containing selected fluorophores were synthesized. The fluorescence quantum yield of the macro-systems was found to be lower than the respective monomer. A series of NLO chromophores having donor groups (i.e., methyl, methoxy, and dimethylamino) and nitro as acceptor were synthesized. They were studied in terms of the nonlinear optical coefficient 3u and thermal stability. The chromophores containing a thiophenyl stilbene conjugation showed superior NLO properties and moderate thermal stability in comparison with their respective analogs. The synthesis of macromolecules containing selected chromophores is also reported.
Finally, preliminary synthesis and characterization of other potentially photoresponsive compounds are presented.
33
Tyombo, Nolukholo. "Synthesis and Luminescence of Zinc Oxide Nanorods-Blended Thiopheno-Organosilicon Polymers." University of the Western Cape, 2017. http://hdl.handle.net/11394/6230.
Full textAbstract:
Magister Scientiae - MSc (Chemistry)The increasing cost of fossil fuel energy production and its implication in environmental pollution and climate change created high demand for alternative and renewable sources of energy. This has led to great interest in research in the field of photovoltaic or solar cells Due to the abundance of sunlight, the technology is sustainable, non-polluting and can be implemented at places where power demand is needed, for example in rural areas. Solar cell devices that have been commercialized are currently based on silicon technology, involving the use of monocrystalline, polycrystalline and amorphous silicon. Although they produce highly efficient solar cells, the cost of Si solar cells is too high. Second generation solar cell materials such as cadmium telluride and third generation materials such as perovskites and organic polymers have been receiving much attention recently. However, they lack the efficiency of Si solar cells. This research proposes the development of high energy conservation photovoltaic cells from novel low-cost organosilicon polymers. The aim was to develop novel highly branched organosilane polymers such as poly(3-hexythiophene), polydi(thien-2-yl)dimethylsilane, poly(3-hexyl- [2,2'] bithiophenyl-5-yl)-dimethyl-thiophen-2yl-silane) as electron donors along with zinc oxide nanorod as the electron acceptor which were able to bring the efficiency of the resultant photovoltaic cell close to that of current Si solar cell.
2021-08-31
34
Turkarslan, Ozlem. "Synthesis, Characterization And Electrochromic Properties Of Conducting Copolymers Of Terephthalic Acid Bis-(thiophen-3-ylmethyl)thioester With Thiophene And Pyrrole And Conducting Polymer Of 1-(4-fluorophenyl)-2,5-di(thiophen-2-yl)-1h-pyrrole." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607169/index.pdf.
Full textAbstract:
Terephthalic acid bis-(thiophen-3-ylmethyl)thioester (TTMT) was synthesized via the reaction of thiophen-3-ylmethanethiol with terephthaloyl dichloride. Nuclear magnetic resonance (1H-NMR) and Fourier transform infrared (FTIR) spectroscopies were utilized for the characterization of the monomer. This 3-functionalized thiophene monomer was polymerized in the presence of thiophene (Th) and pyrrole (Py) upon constant potential application in acetonitrile/tetrabutylammonium tetrafluoroborate (TBAFB). The resulting copolymers were characterized via cyclic voltammetry (CV), FTIR, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), four-probe technique conductivity measurement and UV-Vis spectroscopy. Spectroelectrochemical analysis of P(TTMT-co-Th) revealed π
to &
#960
* transition at 476 nm with a band gap of 2.0 eV whereas, &
#955
max and Eg were found as 375 nm and 2.4 eV for P(TTMT-co-Py), respectively. Dual type electrochromic devices (ECDs) of P(TTMT-co-Th) and P(TTMT-co-Py) with poly(3,4-ethylenedioxythiophene) (PEDOT) were constructed. Spectroelectrochemistry, switching ability, open circuit memory and stability of the devices were examined by UV-Vis spectroscopy and cyclic voltammetry. The device P(TTMT-co-Th)/PEDOT switches between brown and blue upon application of 0.0 V and +2.6 V, respectively with 11% optical contrast and 1.1 s as the switching time. On the other hand, P(TTMT-co-Py)/PEDOT ECD exhibits greenish yellow, grayish red and blue colors with the application of -2.4 V, 0.0 V and +0.8 V, respectively and the contrast between extreme potentials was 17.5% with a switching time of 1.6 s. 1-(4-Fluorophenyl)-2,5-di(thiophen-2-yl)-1H-pyrrole (FPTP) was synthesized and polymerized both chemically and electrochemically. Several analytical techniques, such as NMR, FTIR, CV, gel permeation chromatography (GPC), four-probe conductivity measurement, SEM were utilized when applicable. Spectroelectrochemistry experiments reflected a &
#960
to &
#960
* transition at 398 nm with a band gap energy of 1.94 eV for the polymer. A dual type electrochromic device (ECD) of PFPTP and poly(3,4-ethylenedioxythiophene) (PEDOT) was constructed. The device switches between yellowish brown and blue upon application of &
#8211
0.8 V and +1.1 V, respectively. Optical contrast was calculated as 19.4% with a switching time of 1.4 s at maximum contrast point.
35
Gregg, Alison Dianne. "The design and synthesis of potential dual action cardioprotective agents acting at adenosine receptors." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16629/.
Full textAbstract:
Adenosine and adenosine analogues are recognised as cardioprotective agents due to the responses that they induce through the activation of myocardial adenosine receptors. Antioxidants such as nitroxide radicals have also been found to possess cardioprotective properties in biological systems, namely through their ability to scavenge the oxygen-based free radicals that are potentially damaging to tissues and cells. It was envisaged that the linking of an antioxidant moiety to adenosine would produce an adenosine analogue that activates adenosine receptors and also scavenges oxygen-derived free radicals in the body. Consequently, one aim of this project was to synthesise a series of adenosine analogues that possessed a nitroxide or a phenolic antioxidant at the N6 position of the adenosine skeleton.
Allosteric ligands have several advantages over orthosteric ligands as potential therapeutic agents, and research into the allosteric enhancement of adenosine receptors is a burgeoning field. It was envisaged that the linking of an antioxidant moiety to an allosteric enhancer would produce a compound that enhances the response of endogenous activation of adenosine receptors and also scavenges oxygen-based free radicals in the body. Consequently, a second aim of this project was to synthesise a series of allosteric enhancers of the A1 adenosine receptor that possessed antioxidant capability endowed by a nitroxide or a phenolic antioxidant functionality.
This project has resulted in the synthesis and characterisation of 19 novel N6 substituted adenosine analogues, and additionally 12 novel derivatised thiophenes. Each of the target compounds was tested for its ability to bind to each of the adenosine receptor subtypes and some analogues were found to be potent and selective adenosine receptor agonists.
36
Bulut, Umut. "Synthesis And Characterization Of Conducting Copolymers Of Carboxylic Acid Multithiophene Functionalized Monomers." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1108018/index.pdf.
Full textAbstract:
Synthesis of 2-[(3-thienylcarbonyl)oxy]ethyl 3-thiophene carboxylate
(TOET), 2,3-bis-[(3-thienylcarbonyl)oxy]propyl 3-thiophene carboxylate (TOPT),
and 3-[(3-thienylcarbonyl)oxy]-2,2-bis{[(3-thienylcarbonyl)oxy]}propyl 3-
thiophene carboxylate (TOTPT), and their copolymerization either with
thiophene or pyrrole were achieved. The chemical structures of the monomers
were investigated by Nuclear Magnetic Resonance Spectroscopy (NMR) and
Fourier Transform Infrared Spectroscopy (FTIR). Electrochemical behavior of
the monomers and copolymers were studied by cyclic voltammetry (CV). The
resultant conducting copolymers were characterized via FTIR, Thermal Gravimetry Analysis (TGA), Differential Scanning Calorimetry (DSC), and
morphologies of the films were inspected by Scanning Electron Microscope
(SEM). Conductivities of the samples were measured by using four-probe
technique. The electrochromic and spectroelectrochemical properties of the
copolymers were investigated.
37
Cirpan, Ali. "Synthesis Of Block Conducting Copolymers Of Cholesteryl Functionalized Thiophene And Their Use In The Immobilization Of Cholesterol Oxidase." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604730/index.pdf.
Full textAbstract:
Synthesis and characterization of conducting copolymers were achieved by using thiophene-3-yl acetic acid cholesteryl ester (CM) and poly (3-methylthienyl methacrylate) (PMTM). A new polythiophene containing a cholesteryl side chain in the β
-position was chemically polymerized in nitromethane/carbon tetrachloride using FeCl3 as the oxidizing agent. Polymerization was also achieved by constant current electrolysis in dichloromethane. Subsequently, conducting copolymers of thiophene-3-yl acetic acid cholesteryl ester (CM), PCM1 (obtained from chemical polymerization method), PCM4 (obtained from constant current electrolysis) with pyrrole were synthesized. Thiophene functionalized methacrylate monomer (MTM) was synthesized via esterification of the 3-thiophene methanol with methacryloyl chloride. The methacrylate monomer was polymerized by free radical polymerization in the presence of azobis (isobutyronitrile) (AIBN) as the initiator. Graft copolymers of poly (3-methylthienyl methacrylate)/polypyrrole, (PMTM2/PPy) and poly (3-methylthienyl methacrylate)/polythiophene, (PMTM2/PTh) were synthesized by constant potential electrolyses. PMTM2 coated Pt electrodes were utilized as the anode in the polymerization of pyrrole and thiophene. Moreover, oxidative polymerization of PMTM1 was studied by galvanostatic and chemical techniques. Characterizations of the samples were performed by CV, FTIR, NMR, DSC, TGA and SEM analyses. Electrical conductivities were measured by the four-probe technique. Immobilization of invertase in conducting copolymer matrices, poly (3-methylthienyl methacrylate) with pyrrole and thiophene was achieved by constant potential electrolysis using the sodium dodecyl sulfate as the supporting electrolyte. Polythiophene was also used for immobilization matrices. Cholesterol oxidase has been immobilized in conducting copolymer of thiophene-3-yl acetic acid cholesteryl ester with polypyrrole (CM/PPy) and polypyrrole (PPy) by the electropolymerization method. p-Toluene sulfonic acid was used as a supporting electrolyte. Kinetic parameters (Kinetic parameters
Vmax and Michaelis-Menten constant
Km) and operational stability of enzyme electrodes were investigated. Surface morphology of the films was also examined.
38
Kerman, Ipek. "Synthesis And Characterization Of Poly(oxalic Acid Dithiophen-3-yl Methyl Ester) And Thiophene Ended Poly-&." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605014/index.pdf.
Full textAbstract:
Synthesis and characterization of thiophene ended poly-ε
-caprolactone (PCL) and oxalic acid dithiophen-3-yl methyl ester (ODME) and their copolymers with both pyrrole and thiophene were achieved. Chemical structure of the precursor polymer and monomer were investigated Redox behavior of polymer and monomers were determined by Cyclic Voltammetry (CV). Structural characterization of samples were carried out by 1H, 13C Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared Spectroscopy (FTIR). Conductivities of the films were measured by using four probe technique. Thermal analyses of conducting copolymers were investigated via Differential Scanning Calorimetry (DSC) and Thermal Gravimetry Analysis (TGA). The morphologies of the copolymer films were examined by Scanning Electron Microscopy (SEM). Electrochromic and spectroelectrochemical behavior of the copolymers were investigated, and their ability of employment in device construction has been examined.
39
Zhang, Ji. "The synthesis of several novel non-benzenoid aromatic compounds by use of thiophene intermediates and annulene coupling reactions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0006/NQ32729.pdf.
Full text
40
Çırpan, Ali. "Synthesis of block conducting copolmers of cholesteryl functionalized thiophene and their use in the immobilization of cholesterol oxidase." Ankara : METU, 2004. http://etd.lib.metu.edu.tr/upload/12604730/index.pdf.
Full text
41
Chan, Shu-Hua, and 詹淑華. "Synthesis, Characterization, and Photovoltaic Application of Thiophene-Phenylene-Thiophene (TPT) Based Copolymers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/51965733260229515408.
Full text
42
"Synthesis and applications of 3,4-Bis(trimethysilyl)thiophene." 1996. http://library.cuhk.edu.hk/record=b6073017.
Full textAbstract:
by Xin-Shan Ye.Thesis (Ph.D.)--Chinese University of Hong Kong, 1996.
Includes bibliographical references (p. 136-148).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Mode of access: World Wide Web.
43
Kiriy, Nataliya [Verfasser]. "Synthese undd Charkterisierung von organischen Halbleitern auf der Basis von Thiophenen = Thiophene based semiconductors: synthesis and characterizations / von Nataliya Kiriy." 2005. http://d-nb.info/979173612/34.
Full text
44
Chang, Ke-ming, and 張可明. "Synthesis and Photoelectric Properties of Low Bandgap Thiophene Copolymers." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/68924360598974640236.
Full textAbstract:
碩士國立中山大學
光電工程學系研究所
100
In the field of organic solar technology, there are two main problems, the stability of materials and the low power efficiency. By analyzing the power efficiency of organic solar cells, we can infer that efficiency of absorption and charge mobility are the key factors to these two problems. In this study, we focus on coupling carbazole with different low bandgap moieties. By using Suzuki Coupling, we synthesized new conjugated polymers with main chain structures of D-A sequence. It turns out that the copolymer can form a strong intramolecular charge transfer (ICT). We’ve successfully synthesized two new low bandgap copolymers with D-A sequence, PCAMDT and PCAMDP. These two copolymers show us excellent thermal stabilities with decomposition temperature of 320℃and 355℃,respectively.According to UV-Vis absorption spectrum, PCAMDT and PCAMDP own bandgaps at 1.85 eV and 2.22eV,respectively. Electrochemical analysis reveals that the HOMO and LUMO level of PCAMDT are found to be -5.69eV and -3.77eV,repectively, while the HOMO and LUMO level of PCAMDP are -5.87eV and -3.75eV. These properties make PCAMDT and PCAMDP advantageous materials while applied as high absorbing layers of organic solar cells.
45
Chen, Tai-Wei, and 陳台偉. "Synthesis and characterization of novel poly(thiophene derivative)s." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/09480420319143836412.
Full textAbstract:
碩士國立臺灣大學
高分子科學與工程學研究所
94
This thesis mainly consists of two parts. In the first part, two 3,4-propylenedioxythiophene derivatives, benzyl 3,4-dihydro-3-methyl -2H-thieno[3,4-b][1,4]dioxepine-3-carboxylate (ProDOT-PH) and dodecyl 3,4-dihydro-3-methyl-2H-thieno[3,4-b][1,4]dioxepine-3- carboxylate (ProDOT-COOC12H25) were synthesized by transetherification. PProDOT-PH, which was polymerized by oxidative chemical polymerization, was insoluble in common solvents; however, PProDOT-COOC12H25 was soluble. Chemical structure and molecular weight characteristics of PProDOT-COOC12H25 was studied by IR, 1H NMR, GPC and UV-vis techniques. Both ProDOT-PH and ProDOT-COOC12H25 could form polymer films by electrochemically polymerization method. The oxidized form and reduced form of PProDOT-PH and PProDOT-COOC12H25 with different transmittance contrast were produced under applied certain potentials (-0.1V— 0.6Vand -0.1V— 0.7V). In the second part, electro-active starburst copolymers of 12-arms poly(n-butyl acrylate)(12PBA) and poly(2-dodecyl-2,3-dihydrothieno [3,4-b][1,4]dioxine)(PEDOT-C12H25) were synthesized. 12PBA was synthesized by the ATRP (atom transfer radical polymerization) method, and the end groups of polymer arms were modified to generate thiophene-capped starburst 12PBA-TH. The corresponding structures were identified by 1H-NMR. The studies of molecular weight characteristics of these star polymers were performed on 1H-NMR and GPC instruments. The monomer of 3,4-ethylenedioxythiophene was prepared by transetherification to give 2-dodecyl-2,3-dihydrothieno [3,4-b][1,4]dioxine (EDOT-C12H25). The preparation of electroactive starburst 12PBA-b-PEDOT-C12H25 copolymers was carried out by growing PEDOT-C12H25 chains from the terminated thiophene unit of 12-armed stars via oxidative polymerization method. Chemical structure and molecular weight characteristics of these copolymers were studied by IR, 1H NMR and GPC techniques. It was confirmed by IR and 1H NMR that the copolymer was successfully synthesized. However, the GPC data implied the existence of plenty of linear PEDOT-C12H25, indicating the need of the development of further purification process.
46
Yang, Huei-Ru, and 楊惠如. "Synthesis and properties of indane[2,1-b]thiophene derivatives." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/4qr865.
Full textAbstract:
碩士國立臺灣科技大學
高分子系
94
In this study, ethyl(1-indanylidene)-cyanoacetate(3) has been synthesized by the reaction of 1-indanone with Ethylcyanoacetate, followed by the cyclization with sulfur to given ethyl–2–amino– 8H-indanone[2,1-b]thiophanone-3–carboxylate(5). Compound(5) reacted with acetic anhydride to yield ethyl 2–acetyl-8H-indanone[2,1-b]thiophene-3-carboxylate(7)and with aldehy- des to yield azomethine dyes (C=N) (9) and methine dye(10) and (11), respectively. These compounds were determined by elemental and spectral analysis(FT-IR、1H-NMR and Mass). The solvatochromic behavior of these azo-methine dyes in various solvents were evaluated. Keyword: 1-Indanone、aldehyde、methine
47
Su, Ming-Kun, and 蘇民坤. "Synthesis and Characterization of Thiophene-Based Star-Like Copolymers." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/29332209555924217460.
Full textAbstract:
碩士國立臺灣大學
化學研究所
104
Poly(3-hexylthiophene) (P3HT) has been widely used in organic photovoltaics because of its ease of synthesis, high hole mobility, and relatively efficient light absorption in the visible-light range. However, due to the high crystallinity of P3HTs, most of them assembled into lamellar structures. Therefore, in order to explore other possible morphologies, our strategy is to synthesize a series of well-defined P3HT-based star-like copolymers containing branched alkylated thiophene monomers. The star-like homopolymers were composed of polyphenylacetylene or polythienylacetylene as the core and poly(3-alkylthiophene) (P3AT) as the arms. It has been recently documented that Kumada catalyst-transfer polycondensation (KCTP) with a chain-growth mechanism is able to produce well-defined conjugated polymers. Firstly, the P3HTs with controlled molecular weight and low polydispersity were prepared through KCTP method. After transforming the end-functional groups into ethynyl groups, star-like polymers were synthesized by the “arm-first“ concept in the presence of the rhodium(I) catalyst. After successfully obtaining star-like polymers, we observed that the high crystallinity still drove the polymer morphology to lamellar structures, which were similar to the corresponding macromonomers. To disrupt the strong π-π interactions between P3HT chains, we utilized the 3-(2-ethylhexyl)thiophene to generate star-like copolymers. Unexpectedly, the highly 1D-oriented free-standing films of the star-like copolymers were obtained via a simple rotary evaporation process. To solve the puzzle, we not only fine-tuned the copolymer composition, but also examined how the substrate surfaces influence the degree of orientation in the free-standing films. Finally, their physical properties and optical properties were also investigated.
48
Chiu, Chun-Chieh, and 邱鈞杰. "Synthesis and Characterization of Conjugated Polymers Based on Thiophene and Thienothiophene Fused Hexacyclic Unit and [2-(Thiophen-2-yl)vinyl]thiophene Unit for Organic Thin Film Transistor Applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/5d873k.
Full textAbstract:
碩士國立交通大學
應用化學系碩博士班
101
In this study, two series of conjugated polymers were synthesized for the application of organic thin film transistor（OTFT）. For the first series, a hexacylic ladder monomer（TTDT） consisting of two thiophenes and a thieno[3,2-b]thiophene ring was synthesized. The TTDT monomer was copolymerized with thiophene（T）, thieno[3,2-b]thiophene（TT）, bithiophene（2T）to form the alternating copolymers PTTDT-T, PTTDT-TT and PTTDT-2T. The OTFT devices based on PTTDT-T, PTTDT-TT and PTTDT-2T show the mobilities of 1.52×10-3, 1.62×10-3, 2.83×10-3 cm2s-1V-1 respectively. For the second series, we design a monomer with [2-(Thiophen-2-yl)vinyl] thiophene（TVT） unit. The monomer was copolymerized with 5,6-difluro-4,7-dithiophenyl-2,1,3-benzothiadiazole（DTFBT） unit to form three copolymers PT4VFBT-2od1, PT4VFBT-4d and PT4VFBT-2od2 with different alkyl side chains. The OTFT devices based on PT4VFBT-2od1, PT4VFBT-4d and PT4VFBT-2od2 show the mobilities of 2.4 × 10-1, 4.3 × 10-1, 3.7 × 10-2 cm2s-1V-1 respectively.
49
Klos, Johannes [Verfasser]. "Synthesis and characterization of oligo(thiophene carboxamide)s / Johannes Klos." 2010. http://d-nb.info/1008227714/34.
Full text
50
Liang, Chu-Hua, and 梁琡華. "Synthesis of Thiophene Derivatives as Potential Radiosensitizers and Antiinflammatory Agents." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/67817143543394589582.
Full textAbstract:
碩士國防醫學院
藥學研究所
94
Our laboratory previously carried out the design and synthesis of a series of benzothieno[2,3-c]quinolone derivatives to develop novel anticancer drugs in our laboratories. After screening of the radiosensitizer/radioprotectant, the results showed that benzothiophene intermediates had strong potency to enhance the activity of radiation. On the other hand, literatures indicated that some thiophene derivatives possess significant antiinflammatory activity. Therefore, we further designed and synthesized a series of benzothiophene and thiophene derivatives to develop novel highly effective and low toxic radiosensitizers/radioprotectants and antiinflammatory drugs. The starting materials, p-methoxycinnamic acid, benzo[b]thiophene-2-carboxylic acid, 2-thiophenecarboxylic acid, 3-(2-thienyl)acrylic acid, 2-thiopheneacetic acid, and 2,5-thiophenedicarboxylic acid, were respectively treated with excess thionyl chloride in toluene to the preparation of all the target compounds. After heating at reflux for 1-48 hours and being concentrated in vacuum, acyl intermediates without purification were further reacted with various anilines in the presence of triethylamine to afford the target compounds. The preliminary results showed that benzothiophene and thiophene derivatives revealed potent radiosensization, especially T3c (48.2 %) superior to others. However, the results of target compounds by 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl) -2-(4-sulfophenyl)-2H-tetrazolium, inner salt (MTS) assay showed that none of the synthetic products were active against MCF-7 (breast carcinoma), NCI-H460 (lung cancer), or SF-268 (glioblastoma) cancer cell lines. On the other hand, compounds 5c、5d、M3c、T3c were much potent than ibuprofen after screening of the target compounds by carrageenan-induced paw edema model.