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Title

Σύνθεση και χαρακτηρισμός μεταλλοφωσφονικών ενώσεων με εφαρμογές ως στερεωτικά υλικά

Alternative Title

Synthesis and characterization of metal phosphonate compounds and applications as gypsum consolidants

Author

Ρούμπου, Στέλλα

Thesis advisor

Δημάδης, Κωνσταντίνος

Abstract

Phosphonic acids belong to a very interesting class of organic phosphorus compounds, featuring a direct and strong covalent bond between carbon and phosphorus. In combination with metal ions, inorganic-organic hybrid materials are formed, which are called metal phosphonates and are closely related to the metal-organic frameworks or MOFs. 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. Compared to MOFs, metal phosphonates are not sensitive to air and are also chemically and thermally stable and insoluble in many solvents. Due to those characteristics, they have numerous applications in medicine, industry, energy and in the environment. The present work was focused on the synthesis of some metal phosphonate coordination compounds with ions of alkaline earth metals (Mg₂₊, Ca₂₊ , Sr₂₊, Ba₂₊) and lanthanides (Ce₃₊, Gd₃₊, Dy₃₊, Pr₃₊, Nd₃₊, Sm₃₊, Er₃₊ και La₃₊) under various conditions, with diphosphonate ligands that are analogs of glycine. Some metal phosphonate compounds are also studied, regarding their use as gypsum consolidants. These compounds consist of a derivative of POSS with 16 phosphonate groups, EDTMP and HDTMP as ligands and ions of alkaline earth metals.

Language

Greek

Subject

Consolidants

Diphosphonates

Metal phosphonates

Phosphonic acids

Polyhedral oligomeric silsesquioxanes

Διφωσφονικά οξέα

Μεταλλο-φωσφονικές ενώσεις

Πολυεδρικά σιλοξάνια

Στερεωτικά υλικά