Synthesis and Coordination Chemistry Study of NxO2 Aza-Crown Macrocycle Derivatives in Aqueous Solution

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Moazez, Hedieh | 2025

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 58018 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Ghanbari, Bahram
Abstract:
In this study, a water-soluble Aza-crown N2O2 ligand with a two-carboxylate side arm was synthesized and characterized by 1H-NMR, 13C-NMR, UV-vis, fluorescence, mass spectrometry, and elemental analysis. Unlike EDTA, this ligand is soluble in acidic solution. Fluorescence spectroscopy did not show significant selectivity except for calcium (and to some extent strontium) and copper cations. Due to the similarity of the aminocarboxylate groups with some chelating agents, the ability of this macrocyclic ligand as a scale inhibitor was investigated using the NACE-TM374 standard test method. In these tests, the new arm ligand showed significant protection against the presence of calcium sulfate. Also, 1H-NMR titration was used to determine the interaction site of the macrocyclic ligand with Ca(II) and Cu(II) cations. The results of these titrations indicate the interaction of cations with different parts of the macrocyclic ligand. The results of computational tests show that the stability of the macrocyclic ligand increases after interaction with the aforementioned cations
Keywords:
Macrocycle ; Azacrown ; Scale Inhibitors ; Calcium ; Aqueous Solutions ; Macrocyclic Ligand

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