E-Locus - Institutional Repository of the University of Crete - Ανόργανα-οργανικά υβριδικά ύλικα με βάση ιόντα των λανθανίδων και καρβοξυφωσφονικούς υποκαταστάτες: σύνθεση-δομή-ιδιότητες.

Home Ανόργανα-οργανικά υβριδικά ύλικα με βάση ιόντα των λανθανίδων και καρβοξυφωσφονικούς υποκαταστάτες: σύνθεση-δομή-ιδιότητες.

Results - Details

[Add to Basket]

Identifier

000376575

Title

Ανόργανα-οργανικά υβριδικά ύλικα με βάση ιόντα των λανθανίδων και καρβοξυφωσφονικούς υποκαταστάτες: σύνθεση-δομή-ιδιότητες.

Alternative Title

Organo-inorganic hybrid materials based on lanthanides and carboxyphosphonate ligands: synthesis, structure properties.

Author

Παπαθανασίου, Κωνσταντίνος Ε

Thesis advisor

Δημάδης, Κωνσταντίνος

Reviewer

Μήλιος, Κωνσταντίνος
Τρικαλίτης, Παντελης

Abstract

Over the last years synthesis of new microporous materials has attracted enormous scientific interest due to their structure variability and their potential important properties. Consequently, these materials have been used for gas adsorption or as molecular sieves, they have wide application in catalysis and sensors construction while they are principally been used in fuel cells and hydrogen production apparatus. This study, firstly describes the synthesis of metal-phosphonocarboxylate coordination polymers (MOFs) when hydroxyphosphonoacetic acid (HPAA) is reacted with lanthanide metals ions in several Ln³⁺ :HPAA molar ratios and different pH values. These polymers posses great carbon dioxide and acceptable nitrogen adsorption while they are also characterized by a crystalline-to-amorphous-to-crystalline reversible transformation. Moreover, they express satisfactory values of proton conductivity. In the present work we will also present a description of a new crystallization technique for crystalline materials with the use of hydrogels formed by the hydrophilic polysaccharide sodium alginate as well as its application to gain synthetic access to the new crystalline materials Ca-ΑTMP (ΑTMP = amino-tris(methylenephosphonate)), Ca-PMIDA (PMIDA = phosphonomethyl-imino(diacetate)), Ca-HEDP (HEDP = hydroxyethylidenediphosphonate) with many promising properties due to their interesting crystal structures. Characterization was achieved through the use of X-Ray Crystallography (single crystal and powder), ATR-IR Spectroscopy, FT-IR-Spectroscopy, Elemental Analysis, Scanning Electron Microscopy, Thermogravimetric Analysis and Solid State NMR.

Language

Greek

Subject

ATMP

Gas adsorption

HEDP

HPAA

Hydrogel

Microporous materials

PMIDA

Phosphonic acid

Proton conductivity