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 19 of 19 for “"Single crystal structure"”.
-
Application of X-ray Diffraction Methods and Molecular Mechanics Simulations to Structure Determination and Cotton Fiber Analysis
… X-ray diffraction has been utilized for single-crystal structure determinations, fiber diffraction analyses, and in conjunction with molecular modeling of Cellulose IIII. Although each technique is different in its sampling, data acquisition, data treatment, and identification, the common …
-
Bistability and Electrical Characterisation of Two Terminal Non-Volatile Polymer Memory Devices.
… these materials using two-terminal memory device structures. This research contributes to previous investigation into the internal working mechanisms of polymer memory devices and increases understanding and verifies the principles of these mechanisms through testing previously untested materials …
-
Zinc enzyme model complexes with Ligands containing a N2S Donor Set and their methylating reactions
… <br>by IR and NMR spectroscopy, 14 of them with single crystal structure analysis. <br>9 of the mononuclear tetrahedral N2S2 coordinated zinc complexes have been <br>investigated for the stepwise methylating reactions using the methylating <br>reagent iodmethane and trimethylphosphate. The result …
-
Entwicklung anion-chiraler ionischer Flüssigkeiten und ihre Anwendung in der Katalyse
… This was based on the results of an X-ray single crystal structure analysis and NMR-experiments of this compound. A main focus has been laid upon the central chirality, which has been introduced through the application of a dissymmetric ligand. In addition to the aluminum and boron based …
-
The enclathration of alcohols by cholic acid
A series of crystalline Cholic acid inclusion compounds were studied with a view to understanding the role of guest molecules in inducing and stabilizing a particular Cholic acid (host) lattice structure. Alcohols in the series CH₃(CH₂nOH (n= 0 to 3 and 2-propanol) were employed as guest molecules …
-
Group 3 and Group 13 Metal Hydride Compounds
… synthesized using H2 elimination. Mononuclear structures featuring tetrahedral coordination of the central aluminum atom were observed for the guanidinato ligand stabilized aluminum dialkyl complexes. The (Al)N-C-N(Al) bond angles in the corresponding complexes were determined using structural …
-
Structural Chemistry of Silicon Phthalocyanines
Structures of a number of silicon phthalocyanines have been investigated using both experimental and theoretical methods. Single crystal structures have been determined for some of these silicon phthalocyanines. Various theoretical methods, including the density functional theory (DFT), …
-
Electronic properties of gallium nitride nanowires
… and CVD grown GaN nanowires have the wurtzite single crystal structure. The crystal orientations along the wire axis are (1000) and (1010) for our HVPE and CVD grown nanowires, respectively. The mean diameters are 200 nm and 46 nm for the HVPE and the CVD grown nanowires, respectively. CVD GaN …
-
Size Effects in Shape Memory Ceramics
… in SMCs involve moving towards smaller volume structures, which feature high surface area for stress relaxation and fewer grain boundaries to minimize transformation stresses. While this approach has proven successful, it typically limits SMCs to sample sizes at the micrometer-scale in …
-
Oxidative Addition As A New Route To Organometallic Polymers And Dendrimers
… 2)rbrack.{dollar} X-ray single crystal structure determinations of this dimer and {dollar}rmlbrack PtBrMesb2(CHsb2COsb2CHsb3)(bipy) rbrack{dollar} are reported. The polymerization of {dollar}rmlbrack PtBrMesb2(CHsb2COsb2CH{dollar}={dollar}rm CHsb2)(busb2bipy)rbrack{dollar} …
-
Aminopyridinato-Ligand-Stabilized Lanthanoid Complexes: Synthesis, Reactivity, Ethylene and Isoprene Polymerization
… hydrido clusters were characterized by X-ray structure analyses, and the presence of the hydrid ligands were clearly proved by 1H NMR spectroscopy. Dialkyl complexes, stabilized by aminopyridinato ligands, react with anilinium borate to yield organolanthanoid cations after alkane elimination. …
-
Palladium and manganese catalysis in C-H activation
… cyclisation of mono-halogenated diarylethers via single C-H activation to produce dibenzofurans is discussed. Previous methods for the synthesis of dibenzofurans via transition metal-mediated catalysis suffer from a number of drawbacks. Thus, focus was targeted at addressing many of the …
-
Structural studies of organic crystals of pharmaceutical relevance. Correlation of crystal structure analysis with recognised non-bonded structural motifs in the organic solid state
… techniques and correlation of these results with crystal structural database to establish the presence of physical motifs in selected systems. Structural motifs were identified by the use of single crystal and crystal packing analysis on diverse range of pharma-relevant materials including …
-
Exploring Multiple Hydrogen Bonding and Ionic Bonding in the Design of Supramolecular Polymers
… compared to the counterparts containing only a single binding site, thereby allowing for enhanced mechanical integrity to the polymers and facilitate self-assembly. This dissertation focuses on the design of novel supramolecular polymers building from the doubly-charged or quadruple hydrogen …
-
Preparation, structural characterization and properties of Oxo-vanadates-IV with unusual magnetic states
… were explored. The work focuses on detailed single crystal and powder X-ray diffraction studies, for selected compounds magnetometric measurements were performed. For low-temperature measurements a split coldhead closed cycle He refrigerator was adapted to the image plate diffractometer IPDS …
-
Mesomorphic Dyes based on Conformationally Flexible 1,3,5-Triazines
… semiconductors. Interest in discotic liquid crystals arises from their capacity to combine the high charge carrier mobilities found in crystalline compounds with the solubility, processability and flexibility encountered in amorphous materials. This dissertation focuses on the development of …
-
Identification and mitigation of performance-limiting defects in epitaxially grown kerfless silicon for solar cells
… use is a major driver for cost reduction of crystalline silicon photovoltaic modules. The dominant wafer fabrication process employed in the industry today, ingot casting & sawing, wastes approximately half of the input silicon feedstock due to sawdust (kerf) and ingot tailings. Alternative …
-
Single-crystal elasticity of Al-rich phases in the Earth’s transition zone and lower mantle
… scale required to understand its chemistry and structure and for tracing the chemical anomalies potentially caused by subduction. The velocities of seismic waves through the Earth depend on the elastic properties of the minerals through which they travel. By comparing observations of seismic …