Transition metal ion co-ordination in hydrophilic polymer membrane
This thesis is concerned with the investigation of transition metal (TM) ion complexation with hydrophilic membranes composed of copolymers of 4-vinyl pyridine & 4-methyl-4'vinyl- 2,2'-bipyridine with 2-hydroxyethyl methacrylate. The Cu(II), CoCII) & Fe(II) complexes with these coo...
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ndltd-bl.uk-oai-ethos.bl.uk-6001872017-04-20T03:26:55ZTransition metal ion co-ordination in hydrophilic polymer membraneLewis, A. L.1991This thesis is concerned with the investigation of transition metal (TM) ion complexation with hydrophilic membranes composed of copolymers of 4-vinyl pyridine & 4-methyl-4'vinyl- 2,2'-bipyridine with 2-hydroxyethyl methacrylate. The Cu(II), CoCII) & Fe(II) complexes with these coordinating membranes were characterised by a variety of techniques, in order to assess the effect of the polymer on the properties of the complex, and vice versa. A detailed programme of work was instigated into the kinetics of formation for the polymer-bound tris(bipyridyl) iron(II) complex; the rate and extent of complex formation was found to be anion-dependent. This is explained in terms of the influence of the anion on the transport properties and water content of the membrane, the controlling factor in the development of the tris-complex being the equilibrium concentration of Fe(II) in the gel matrix. A series of transport studies were performed with a view to the potential application of complexing hydrogel membranes for aqueous TM ion separations. A number of salts were studied individually and shown to possess a range of permeabilities; the degree of interaction between particular metal-ion:ligand combinations is given by the lag-time observed before steady-state permeation is achieved. However, when two TM salts that individually display different transport properties were studied in combination, they showed similar lag-times & permeabilities, characteristic of the more strongly coordinating metal ion. This 'anti-selective' nature thus renders the membrane systems unsuitable for TM ion separations. Finally, attempts were made to synthesise and immobilise a series of N ,0-donor macrocyclic ligands into hydrogel membranes. Although the functionalisation reactions failed, limited transport data was obtained from membranes in which the ligands were physically entrapped within the polymer matrix.546Aston Universityhttp://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600187http://publications.aston.ac.uk/21355/Electronic Thesis or Dissertation |
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546 Lewis, A. L. Transition metal ion co-ordination in hydrophilic polymer membrane |
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This thesis is concerned with the investigation of transition metal (TM) ion complexation with hydrophilic membranes composed of copolymers of 4-vinyl pyridine & 4-methyl-4'vinyl- 2,2'-bipyridine with 2-hydroxyethyl methacrylate. The Cu(II), CoCII) & Fe(II) complexes with these coordinating membranes were characterised by a variety of techniques, in order to assess the effect of the polymer on the properties of the complex, and vice versa. A detailed programme of work was instigated into the kinetics of formation for the polymer-bound tris(bipyridyl) iron(II) complex; the rate and extent of complex formation was found to be anion-dependent. This is explained in terms of the influence of the anion on the transport properties and water content of the membrane, the controlling factor in the development of the tris-complex being the equilibrium concentration of Fe(II) in the gel matrix. A series of transport studies were performed with a view to the potential application of complexing hydrogel membranes for aqueous TM ion separations. A number of salts were studied individually and shown to possess a range of permeabilities; the degree of interaction between particular metal-ion:ligand combinations is given by the lag-time observed before steady-state permeation is achieved. However, when two TM salts that individually display different transport properties were studied in combination, they showed similar lag-times & permeabilities, characteristic of the more strongly coordinating metal ion. This 'anti-selective' nature thus renders the membrane systems unsuitable for TM ion separations. Finally, attempts were made to synthesise and immobilise a series of N ,0-donor macrocyclic ligands into hydrogel membranes. Although the functionalisation reactions failed, limited transport data was obtained from membranes in which the ligands were physically entrapped within the polymer matrix. |
author |
Lewis, A. L. |
author_facet |
Lewis, A. L. |
author_sort |
Lewis, A. L. |
title |
Transition metal ion co-ordination in hydrophilic polymer membrane |
title_short |
Transition metal ion co-ordination in hydrophilic polymer membrane |
title_full |
Transition metal ion co-ordination in hydrophilic polymer membrane |
title_fullStr |
Transition metal ion co-ordination in hydrophilic polymer membrane |
title_full_unstemmed |
Transition metal ion co-ordination in hydrophilic polymer membrane |
title_sort |
transition metal ion co-ordination in hydrophilic polymer membrane |
publisher |
Aston University |
publishDate |
1991 |
url |
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600187 |
work_keys_str_mv |
AT lewisal transitionmetalioncoordinationinhydrophilicpolymermembrane |
_version_ |
1718441283391848448 |