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Identifier 000441513
Title Ανόργανα-οργανικά υβρίδια αλκαλικών γαιών και φωσφονικών παραγώγων αμινοξέων : εφαρμογές στην αντιδιαβρωτική προστασία
Alternative Title Inorganic-organic hybrids of alkaline earth metals and phosphonic derivatives of amino acids:applications in anticorrosion protection
Author Φανουργιάκης, Απόστολος Γ.
Thesis advisor Δημάδης, Κωνσταντίνος
Reviewer Στούμπος, Κωνσταντίνος
Σπύρος, Απόστολος
Abstract (Poly)phosphonic acids are organic molecules that possess one or more functional phosphonate –PO3H2 groups connected to an organic fragment through stable, covalent P-C bonds. This protects them from hydrolysis and degradation when used as chemical additives in industrial water systems. The combination of metal ions and these (poly)phosphonic acids yields metal phosphonate hybrid materials. The majority of metal phosphonates are coordination polymers with a variety of structural motifs (1D, 2D, or 3D), and, to a lesser extent, 0D complexes. In this thesis a new family of diphosphonate ligands, have been synthesized from glycine and other artificial amino acids (analogs of glycine). Specifically, the H atoms on the α-carbon were substituted with either two methyl groups, or a 5-, or a 6- membered aliphatic ring. The synthesis of these diphosphonate ligands was carried out via a Mannich-type reaction. Combination of these ligands with ions of alkaline earth metals (Mg2+, Ca2+. Sr2+, Ba2+) produce novel metal-phosphonate materials. Nine new metal phosphonate coordination polymers (1D, 2D and 3D) and one dinuclear complex of magnesium have been structurally characterized by single crystal X-ray diffraction. The efficiency of the «free» ligands, as well as their combination with alkaline earth metal ions, was evaluated in anti-corrosion experiments on carbon steel specimens at different concentrations (0.1 mM, 0.5 mM and 1 mM) and pH regimes (4, 5 and 6). The results of these experiments were encouraging, as high inhibition of metallic corrosion was observed under specific conditions.
Language Greek
Subject Amino acids
Coordination polymers
Mannich-type reaction
Metallic corrosion
Phosphonic acids
Αντίδραση τύπου Mannich
Διφωσφονικά οξέα
Μεταλλική διάβρωση
Μεταλλο-φωσφονικές ενώσεις
Πολυμερή συναρμογής
Φωσφονικά οξέα
Issue date 2021-07-30
Collection   School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
  Type of Work--Post-graduate theses
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