Linking Coordinated Amine Ligands to Make Cages
Gill, Sukhpreet Kaur
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This thesis presents the study of cage complexes that link the coordinated amine ligands containing cobalt(III) ion. New multidentate cage-type amine ligands are synthesised by linking di-, tri-, and tetra-dentate amine ligands coordinated to cobalt(III) through intramolecular condensation with formaldehyde and ammonia. The cobalt(III) complexes used in this study are [Co(tren)(en)]³⁺, [Co(dien)₂]³⁺, [Co(bamp)₂]³⁺, and [Co(NH₃)₆]³⁺. All the ligands and starting materials have been synthesised and characterised by NMR spectroscopy and ESI-MS spectrometry. Attempts to synthesise the pure uns-penp ligand was not successful. Attempts to crystallise the products were unsuccessful. All other cobalt(III) complexes were reacted with formaldehyde and ammonia and the cage complex derived from [Co(tren)(en)]³⁺ is best characterised by NMR and ESI-MS data which suggests the formation of four possible isomers. Structural optimisation using DFT was also performed for this complex which favours the formation of different isomers.