Linking Coordinated Amine Ligands to Make Cages
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Date
Authors
Gill, Sukhpreet Kaur
Supervisor
Blackman, Allan
Item type
Thesis
Degree name
Journal Title
Journal ISSN
Volume Title
Publisher
Auckland University of Technology
Abstract
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.Description
Keywords
Cobalt(III), Cobalt complexes, Amine ligands, Encapsulation, Metal cage complexes, Coordination complexes