Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547478
Title: New main group and rare earth complexes and their applications in the ring-opening polymerisation of cyclic esters
Author: Cushion, Michael Gregory
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2011
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Abstract:
This Thesis describes the synthesis and characterisation of new Main Group and Rare Earth alkyl, amide, alkoxide and borohydride complexes and their use as catalysts for the ring-opening polymerisation (ROP) of ε-caprolactone and rac-lactide. Chapter 1 introduces ROP from an industrial and academic perspective, as well as polymer characterisation techniques. A literature review is given, with an emphasis placed on Main Group catalysts. Chapter 2 describes the synthesis and characterisation of new homo- and hetero-scorpionate Main Group complexes. An introduction to homo- and hetero-scorpionate ligands is given, as well as a discussion of the ε-caprolactone and rac-lactide ROP activity displayed by the new complexes. Chapter 3 describes the synthesis and characterisation of new neutral and cationic Main Group borohydride complexes supported by the tris(pyrazolyl)methane and tris(pyrazolyl)hydroborate ligands. A review of borohydride complexes is also given. The ε-caprolactone and rac-lactide ROP activity shown by the complexes presented is also discussed. Chapter 4 describes the synthesis and characterisation of new mono- and di-cationic yttrium complexes supported by the tris(pyrazolyl)methane and triazacyclononane ligands. An introduction to the synthesis of neutral and cationic Rare Earth complexes is given. An overview of immortal ROP is also provided. The activity of the new complexes towards the immortal ROP of rac-lactide is also discussed. Chapter 5 contains experimental details and characterising data for the new complexes reported in this thesis. CD Appendix contains .cif files for all of the new crystallographically characterised complexes.
Supervisor: Mountford, Philip Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.547478  DOI: Not available
Keywords: Inorganic chemistry ; Catalysis ; Co-ordination chemistry ; Organometallic Chemistry ; Ring-Opening Polymerisation ; Cyclic Esters ; Lactide ; Caprolactone ; Alkaline Earth ; Main Group ; Rare Earth ; Cationic ; Borohydride ; Tris(pyrazolyl) methanide ; Tris(pyrazolyl) hydroborate ; amide ; alkoxide ; alkyl
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