Sökning: "single-crystal X-ray crystallography"

Visar resultat 1 - 5 av 20 avhandlingar innehållade orden single-crystal X-ray crystallography.

1. 1. Solving Mysteries and Outwitting Transitions : Investigating the Incommensurate Crystal Structures of AuIn and Sn3Sb2

   Författare :Laura Folkers; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Crystallography; Modulation; Intermetallics; X-Ray Diffraction; Single crystal;

   Sammanfattning : This thesis introduces two new incommensurate alloys. AuIn shows variable amounts of modulation, depending on the measurement temperature. At 400°C the diffraction pattern shows diffuse scattering and a thallium iodide type Cmcm space group. LÄS MER

3. 2. Crystallography in Four Dimensions : Methods and Applications

   Författare :Gunilla Carlsson; Janos Hajdu; Dieter Oesterhelt; Vilmos Fülöp; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molecular biophysics; horseradish peroxidase; redox reactions; X-ray crystallography; haem catalysis; molecular movies; radiation damage; Molekylär biofysik; Molecular biophysics; Molekylär biofysik;

   Sammanfattning : The four-electron reduction of dioxygen to water is the most exothermic non-photochemical reaction available to biology. A detailed molecular description of this reaction is needed to understand oxygen-based redox processes. Horseradish peroxidase (HRP) is a haem-containing redox enzyme capable of catalysing the reduction of dioxygen to water. LÄS MER

4. 3. Molecular Structure and Packing of Platinum(II) Complexes with S-donor Ligands in the Solid State An X-ray Crystallographic Study

   Författare :Christian Hansson; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; low temperature; high-pressure; structural class concept; hydrogen bonding; intermolecular interactions; crystallography; platinum coordination compounds; packing; phase transitions; Inorganic chemistry; Oorganisk kemi;

   Sammanfattning : How do molecules arrange themselves in a crystal? It is today not possible to definite predict the three-dimensional packing arrangement of molecules in the crystalline solid state. The aim of the work presented in this thesis has been to gain more knowledge of what principles that govern molecular packing. LÄS MER

5. 4. Open-Framework Germanates : Crystallography, structures and cluster building units

   Författare :Kirsten Elvira Christensen; Xiaodong Zou; Osamu Terasaki; Angeles Monge; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; germanate; crystallography; building unit; zeotype; scale chemistry; Chemistry; Kemi; strukturkemi; Structural Chemistry;

   Sammanfattning : This thesis is focussing on the crystallographic challenges and what knowledge we can gain from studying the different open-framework germanates. Five new open-framework germanates have been synthesized and the structures have been determined by single crystal X-ray diffraction. LÄS MER

7. 5. Homochiral crystals for selective synthesis

   Författare :Theonitsa Kokoli; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Absolute asymmetric synthesis; total spontaneous resolution; optical activity; coordination compounds; coordination polymers; photoisomerization; enantioselective sulfide oxidation; single crystal X-ray crystallography; co-crystallization of diastereomers;

   Sammanfattning : Six new coordination compounds were prepared from monodentate sulfide ligands and copper(I) halides and their crystal structures were determined by single-crystal X-ray diffraction. The aim was to prepare coordination polymers that crystallize as conglomerates in order to use them in total spontaneous resolution. LÄS MER