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National Repository of Grey Literature

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Fluorine nuclear relaxation times in chelates with lanthanides Bobrova, Yulia ; Římal, Václav (advisor) ; Wagnerová, Dita (referee) Contrast agents containing fluorine have great prospects for magnetic resonance imaging in medicine. Low representation of fluorine in human body and the suitable magnetic properties of its nucleus 19 F, provide great sensitivity. The slow relaxation of 19 F, can be shortened by using paramagnetic complexes.In this thesis, transversal and longitudinal 19 F relaxation times of chelates with different paramagnetic lanthanides (Ce, Yb,Tm, Dy, Ho) were measured in two different magnetic fields: 4,7 and 11,7 T. Their values meet the expected assumptions. Furthermore, the values are compared with Bloch-Redfield- Wangsness theory.While Ho, Tm, and Dy reduce fluorine nuclear relaxation times to milliseconds, which is too short for MRI, relaxation rates of Ce a Yb reach approximately 100ms. Such relaxation rates can be considered as optimal for imaging methods. On the basis of our results it is possible to find suitable candidates for fluorine contrast media and optimize the measurement sequence settings in further research or in clinical use. Detailed record

Organophosphorus derivatives for "click-chemistry" Zemek, Ondřej ; Kotek, Jan (advisor) ; Veselý, Jan (referee) Ondřej Zemek Organophosphorus derivatives for "click-chemistry" In this diploma thesis two new macrocyclic ligands were synthesized. They have DO3A moiety where metal (lanthanide) ion can be coordinated and terminal acetylenic or azide group connected through the phosphinic acid. Both terminal acetylenic and azide group should serve for connecting to another molecules or partitions by mean of "click chemistry" i.e. [1,3] copperI catalyzed dipolar cycloaddition between azide and acetylene. In this thesis two ligands, its complexes with some lanthanides as well as its precursors were prepared and characterized. Gd3+ complexes will be further used and studied for potential MRI contrast agents applications. Detailed record

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