Design, synthesis, and characterization of conjugated polymers and functional paramagnetic materials for dynamic nuclear polarization
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2010.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2011
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| Online Access: | http://hdl.handle.net/1721.1/62051 |
| _version_ | 1826212339314065408 |
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| author | Dane, Eric Lawrence |
| author2 | Timothy M. Swager. |
| author_facet | Timothy M. Swager. Dane, Eric Lawrence |
| author_sort | Dane, Eric Lawrence |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2010. |
| first_indexed | 2024-09-23T15:20:09Z |
| format | Thesis |
| id | mit-1721.1/62051 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T15:20:09Z |
| publishDate | 2011 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/620512019-04-12T11:56:51Z Design, synthesis, and characterization of conjugated polymers and functional paramagnetic materials for dynamic nuclear polarization Dane, Eric Lawrence Timothy M. Swager. Massachusetts Institute of Technology. Dept. of Chemistry. Massachusetts Institute of Technology. Dept. of Chemistry. Chemistry. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2010. Vita. Cataloged from PDF version of thesis. Includes bibliographical references. The design, synthesis, and characterization of a series of radicals and biradicals for use as dynamic nuclear polarization (DNP) agents is described. DNP is a method to enhance the S/N-ratio in solid-state nuclear magnetic resonance (SS-NMR) that involves transferring the polarization of electrons, which are more easily polarized due to their larger magnetic moment, to nuclei. Two strategies to improve the performance of DNP-agents have been explored. The first involves combining a carbon-centered radical (1,3-bisdiphenylene-2-phenylallyl (BDPA) radical), which has a narrow line width at high field, with a nitroxide radical (2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical), which has a broader line width at high field. The synthesis and characterization of a BDPA-TEMPO biradical is described and is a first step in testing whether polarization agents of this type will out perform the currently used biradicals. Additionally, the synthesis of a water-soluble derivative of BDPA is described. The second strategy involves designing dinitroxide biradicals that rigidly hold the radicals in an orthogonal geometry. The synthesis of dinitroxide radicals of this type is described, along with efforts to optimize aqueous solubility. The design, synthesis, and characterization of thioether-containing poly(paraphenylene-ethynylene) (PPE) copolymers are reported. The polymers show a fluorescence turn-on response when exposed to oxidants in solution, and the oxidized polymers show desirable thin-film properties, such as high quantum yields and increased photostability. Work towards the synthesis of electroactive conjugated polymers based on the BDPA free radical is also reported. by Eric Lawrence Dane. Ph.D. 2011-04-04T16:17:36Z 2011-04-04T16:17:36Z 2010 2010 Thesis http://hdl.handle.net/1721.1/62051 707924403 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 227 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Chemistry. Dane, Eric Lawrence Design, synthesis, and characterization of conjugated polymers and functional paramagnetic materials for dynamic nuclear polarization |
| title | Design, synthesis, and characterization of conjugated polymers and functional paramagnetic materials for dynamic nuclear polarization |
| title_full | Design, synthesis, and characterization of conjugated polymers and functional paramagnetic materials for dynamic nuclear polarization |
| title_fullStr | Design, synthesis, and characterization of conjugated polymers and functional paramagnetic materials for dynamic nuclear polarization |
| title_full_unstemmed | Design, synthesis, and characterization of conjugated polymers and functional paramagnetic materials for dynamic nuclear polarization |
| title_short | Design, synthesis, and characterization of conjugated polymers and functional paramagnetic materials for dynamic nuclear polarization |
| title_sort | design synthesis and characterization of conjugated polymers and functional paramagnetic materials for dynamic nuclear polarization |
| topic | Chemistry. |
| url | http://hdl.handle.net/1721.1/62051 |
| work_keys_str_mv | AT daneericlawrence designsynthesisandcharacterizationofconjugatedpolymersandfunctionalparamagneticmaterialsfordynamicnuclearpolarization |