National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Complexes of 1,4,7-triazacyclononane derivatives
Kubinec, Jan ; Kubíček, Vojtěch (advisor) ; Vojtíšek, Pavel (referee)
The aim of this thesis was to prepare monoamide of macrocycle H3NOTA, which was prepared by multiple step synthesis. Ligand was characterized by NMR, MS and X-ray difraction analysis. Acid-base properties were studied by potentiometric titrations. Four protonation constants pKa`s were found and these protonation constants are lower than pKa`s of H3NOTA. Coordination properties with selected metal ions from the first row of transition metal, metal ions of biological interest and with lithium ions were investigated by potentiometric titration. Stability constants show that monoethylamide derivative of macrocycle H3NOTA forms complexes with lower stability than diethylamide derivative of macrocycle H3NOTA. Stability constants for complexes which contains amide group are lower than for H3NOTA complexes. Kinetics of Ga3+ complexation was investigated at different pH by 71 Ga NMR. The rate constants of and half-lives of complexation were determined at pH = 1. The rate constant was higher and the half-life of complexation was shorter than for H3NOTA ligand. Key words: macrocyclic complexes, thermodynamic stability, formation kinetics, radiopharmaceutical
Coordination properties of NOTA monoamide
Kubinec, Jan ; Kubíček, Vojtěch (advisor) ; Matulková, Irena (referee)
The aim of this thesis was to prepare monoamide of macrocycle NOTA, which was successfully prepared and fully characterized. Acid-base properties were investigated by potentiometric titration and four protonation constants were found, which are lower than pKa ` s of NOTA ligand. Coordination properties with selected ions from the first row of transition metals were investigated. Stability constants of studied complexes are also lower than the same complexes with NOTA ligand. Key words: macrocyclic complexes, positron emission tomography, thermodynamic stability, formation kinetic, radiopharmaceuticals

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