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Synthesis of Aza-Crown Macrocyclic Ligand Appended with Side Arms and Study of their Coordination and Supramolecular Chemistry with Cu2+ and C60

Rezvanifar, Maryam | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53500 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Ghanbari, Bahram
  7. Abstract:
  8. In the present study, the coordination chemistry of an O4N4-tetrabenza-crown ether macrocyclic ligand L1 with M2+ (M= Cu, Cd, Hg, and Pb) was investigated by employing UV-visible, 1H-NMR spectroscopy in their solutions. According to the association constants calculated by 1H-NMR titrations, the complex formation stability for these closed shell cations was found in a series of Pb > Hg > Cd, leading to the larger cation, the better accommodation with L1. Moreover, the supramolecular interaction of L1 with fullerene C60 was also assessed by UV-visible spectroscopy. Meanwhile, the structure of [Cd(1)]2+ complex was determine by X-ray crystallographic method in their solid state. A square pyramidal geometry was determined around cadmium cation in [Cd(1)]2+ complex. A new tetrabenzoate-substituted macrocyclic derivative of L1, namely L2, was also successfully synthesized and characterized by 1H-, 13C-NMR, IR, CHN microanalysis. Although, the coordination stability of L2 demonstrated the above order, but the supramolecular interaction of L2 with fullerene C60 was found more significant in terms of their association constant measurements. As the representative first-row transition metal cation, the complex formation of Cu2+ cation was also evaluated by UV-visible spectroscopy, employing Benesi–Hildebrand method
  9. Keywords:
  10. Azacrown ; Fullerene ; Supramolecular Chemistry ; Macrocyclic Ligand ; Complexation

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