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.
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Showing 1 to 16 of 16 for “"X-ray structure analysis"”.
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Structural studies of polynuclear metal carbonyl derivatives
X-Ray structure analysis of fifteen metal carbonyl cluster compounds of nuclearity three to seven have been carried out to investigate the effect organo-fragments have on metal core geometry.
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Molecular studies of natural products and related compounds.
… thesis involves the use of direct methods of X-ray structure analysis for the structure elucidation of novel natural products and related compounds. Empirical force field calculations are also used for conformational and biosynthetic studies. An outline of the development of direct methods of …
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ΣΥΝΘΕΣΗ, ΦΑΣΜΑΤΟΣΚΟΠΙΚΗ ΚΑΙ ΚΡΥΣΤΑΛΛΟΓΡΑΦΙΚΗ ΜΕΛΕΤΗ ΤΗΣ ΔΟΜΗΣ ΚΑΙ ΘΕΩΡΗΤΙΚΑ ΜΟΝΤΕΛΑ ΣΥΜΠΛΟΚΩΝ ΤΩΝ ΣΟΥΛΦΟΝΥΛΟΥΡΙΩΝ ΜΕ D8,D9 ΚΑΙ D10 ΜΕΤΑΛΛΟΙΟ...
… WERE STUDIED AND CHARACTERIZED BY ELEMENTAL ANALYSIS, MAGNETICALLY AND SPECTROSCOPICALLY (IR SPECTRA, UV-VIS SPECTRA, EPR SPECTRA, NMR SPECTRA, MASS SPECTRA), THERMAL ANALYSIS, X-RAY STRUCTURE ANALYSIS, THEORETICAL CALCULATIONS OF THE MOLECULAR STRUCTURE, CONDUCTOMETRIC AND POTENTIOMETRIC …
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The synthesis and chemistry of the cyclophanenes and their metal complexes
… [3,2] (1,3) cyclophane, 72c. An X-ray structural determination of the monothiacyclophane 72a revealed an anti-stepped geometry of the molecule and that the aromatic rings were bent outward in a slightly distorted boat form. A reciprocal relationship between deviations of the inner …
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Influence of High Temperature Creep upon the Structure of ß-NiAl and ß-NiAl(Fe) Single Crystals
… the influence of high temperature creep upon the structure of ß-NiAl and ß-NiAl(Fe) single crystals. A non-destructive procedure is established following the classic line of X-ray structure analysis, namely controlling the chemical composition with the electron probe microanalysis, determining the …
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Amphiphilic Spin Crossover Complexes
… Structural investigations using single crystal X-ray structure analysis gave a detailed insight into structure-property relationship of the synthesized complexes. The mechanism of the SCO of [FeLa(C16)(py)2], a complex with the chain length of 16 carbon atoms and pyridine in axial positions was …
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Carbene catalyzed asymmetric nucleophilic acylations with novel triazolium salts
… the intermolecular Stetter reaction. The structure of 1-Methyl triazolidine was elucidated by X-ray structure analysis. Moreover, we have demonstrated that 1-methyl triazolidine lacked catalytic activity in the intermolecular Stetter reaction. In the processes of searching the optimal …
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Asymmetrische Synthese ausgehend von allylischen Sulfoximinen: neuartige Gamma-Aminosäuren und cyclische Aminosulfoxonium Ylide
… further topic of this thesis were synthesis and structure elucidation of new cyclic aminosulfoxonium ylides. Homoallylic sulfoximines were activated by N-methylation. Treatment with base induced a five-step one-pot domino reaction in the course of which two new ring systems were established …
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Synthesis and characterisation of novel α-functionalised phosphoryl derivatives
… possible configurations, SSSS/RRRR. The crystal structure of the novel N-functionalised macrocycle shows an extended hydrogen-bonded structure in the solid state. The macrocycle has an unusual conformation with the pendant arms alternating ‘up’ and ‘down’ around the ring. The La3+ complex has a …
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Structural Characterisation of the Mammalian SRP Receptor
… SRβ effector interactions should be obtained. X-ray structure analysis was used to determine the structure of a soluble form of SRβ (SRβΔTM) in its GTP bound state in complex with a fragment of SRα. The structure allows to precisely define the minimal SRβ binding domain of SRα (SRX). The homology …
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"The New Chemistry" - Sustainable Catalysis with Alcohols
… state was identified by NMR experiments and X-ray structure analysis to be an iridium trihydride. This trihydride is formed under catalytic conditions, by treatment of the pre-catalyst with alcohols or in hydrogen atmosphere. In the final part of the work, a catalytic pyridine synthesis was …
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Amphiphile Phosphane für die Anwendung in neuen polaren Medien
… by fractionalised crystallisation. The X-ray structure determinations of these complexes gave an insight into the mechanism of the used reagents. The chiral phosphine has been obtained in 97% ee after liberation of its palladium complex. The structures of the compounds 14, 26, 45, 54, 59, …
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Untersuchungen zur Struktur und Funktion der Glutathionsynthetase bei der Spalthefe Schizosaccharomyces pombe
… alignment. Based on this alignment and on the x-ray coordinates of the human enzyme, a structural model of the fission yeast glutathione synthetase was produced. According to this model, the structure of the fission yeast protein is very similar to its human ortholog. The amino acid residues …
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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 …
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Herstellung und Charakterisierung hochaffiner Inhibitoren für die Zytokine IL-6 und LIF basierend auf den Liganden-bindenden Domänen ihrer Rezeptor-Untereinheiten
… to the hexameric IL-6 receptor complex, the structure of which was revealed by x-ray structure analysis in other studies. It was stated, that the IL-6 receptor complex is composed of two molecules of each IL-6, IL-6R alpha and gp130. The first part of the present study highlights that …
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Antimalarial benzimidazoles and related structures incorporating an intramolecular hydrogen bonding motif: medicinal chemistry and mechanistic studies
… frontrunner analogue 1.3 as a guide. A structure-activity relationship (SAR) plan was pursued to produce diverse analogues due to modifications around the core scaffold. The SAR was explored with aromatic and aliphatic groups. As a result, 19 structural variants were synthesized and …