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Identifier

000416052

Title

Μεταλλοφωσφονικά υλικά δισθενών/τρισθενών μετάλλων και αμινοδιφωσφονικών υποκατάστατων αυξανόμενου μήκους πλευρικής αλυσίδας : εφαρμογές στην αντιδιαβρωτική προστασία

Alternative Title

Metal phosphonates materials with divalent/trivalent metals and aminodiphosphonate liganda of increased side-chain length: applications in anticorroston protection

Author

Μοσχονά, Αργυρή Σ.

Thesis advisor

Δημάδης, Κωνσταντίνος

Reviewer

Μήλιος, Κωνσταντίνος
Τρικαλίτης, Παντελεήμων

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 aminodiphosphonate ligands of the general formula RN(H)(CH₂PO₃H₂)(CH₂PO₃H), R = methyl (MBMP), ethyl (EBMP), butyl (BBMP), hexyl (HBMP), octyl (OBMP), dodecyl (DABMP), have been synthesized from variable-chain length monoamines via the Mannich reaction. Combination of these aminodiphosphonate ligands with divalent metal ions (Zn²⁺, Ca²⁺) and lanthanides Sm³⁺, Gd³⁺) produce novel 2D metal phosphonate materials. Five new 2D layered metal phosphonate materials have been structurally characterized by single crystal X-ray diffraction (Zn-EBMP, Zn-OBMP, Ca-MBMP, Ca-EBMP and Ca-OBMP) and two by powder X-ray diffraction (Sm-EBMP and Gd-EBMP). The efficiency of the Zn-diphosphonate, Ca-diphosphonate, Sm-EBMP and Gd-EBMP systems was evaluated in anti-corrosion experiments on carbon steel specimens at different concentrations (0.01 mM, 0.1 mM and 1 mM) and pH regimes (2, 3 and 4). The metal-phosphonate anti-corrosion coatings exhibit variable performance, depending on the nature of the metal and side-chain length.

Language

Greek

Subject

Aminodiphosphonate

Coordination polymers

Inhibitors, corrosion

Mannich reaction

Phosphonic acids

Αμινοφωσφονικό οξύ

Αντίδραση Mannich

Μεταλλική διάβρωση

Μεταλλοφωσφονικές ενώσεις