Κατεύθυνση Ανόργανη Χημεία και Εφαρμογές της στη Βιομηχανία
Library of the School of Science

2020-02-26

2020

Oikonomopoulos Panagiotis

Ιωάννης Παπαευσταθίου, Αναπληρωτής Καθηγήτης, Τμήμα Χημείας, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών

Νέες Μεταλλο-Οργανικές Κατασκευές Ιόντων των Βαρέων Μετάλλων που Βασίζονται σε Οξαλαμιδικούς Υποκαταστάτες

Greek

New Metal-Organic Frameworks of Heavy Metal Ions based on Oxalamide Ligands

The synthesis and isolation of new Metal-Organic Frameworks MOFs is nowadays one of the most interested subfields of synthetic inorganic chemistry. MOFs are characterized as coordination polymers, which extend in two or three dimensions and contain potentially empty voids while they are formed by the bridging of metal ions or metal clusters with organic bringing ligands. Due to their porous nature, they exhibit a huge range of properties, and in the recent years their application as electrochemical and optical sensors has been in the center of research.
Over the last years, our research group has been using oxalamide-based ligands as organic bridges. In this thesis, we investigated the coordination chemistry of such a tetra-carboxylic oxalamide ligand [N,N’-bis(2,4-dicarboxy-phenyl)-oxalamide, H6L] with heavy metal ions. H6L can be deprotonated up to six times, leading us to a variety of synthetic strategies with different reaction systems in order to synthesize new MOFs and isolate them in the form of a single crystal. In this work, we managed to isolate two new coordination polymers, one based on mercury and one based on cadmium. [Hg(H4L)(DMA)2]n extends to two dimensions and through hydrogen bonds it extends to the third dimension. On the other hand, [Cd3(H2L)1.5(DMA)5]n forms a three-dimensional network, significantly different from the known by our research group {[(CH3)2NH2]2[Cd(H2L)]}n, which yields from a similar reaction system. Moreover, we characterized both new structures crystallographically and topologically and tested their thermal stability up to 800 ºC. The purpose of the synthesis of the two products was to compare them with the corresponding amorphous materials of the general formula M@Ca-MOF (M = Hg, Cd), resulting from the ion-exchange of Ca2+ from Ca-MOF by Hg2+ and Cd2+ in aqueous solutions.

Science

Metal-Organic Frameworks, Heavy Metals, Crystal structure

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https://pergamos.lib.uoa.gr/uoa/dl/object/2898259