The synthesis and characterization of two donor acceptor type conjugated polymers were investigated.
The electrochemical properties were examined using cyclic voltammetry, spectroelectrochemistry and
kinetic studies.
The increase in the alkyl chain length attached to the fluorene unit was investigated by the
corresponding electrochemical characteristics. The synthesis was carried out via Stille coupling of 4,7-
dibromo-4' / -(tert-butyl)spiro[benzo[d]imidazole-2,1' / cyclohexane] and 2,5-
bis(tributylstannyl)thiophene with 9,9-dihexyl-9H fluorene and 9,9-didodecyl-9H fluorene
respectively. Both of the polymers were neutral state green polymers. They had optical band gaps of
2.46 and 2.54 eV respectively. Increasing the chain length resulted in an increase in solubility and
processibility of the polymer but also an increase in the band gap. This was due to the increased
bulkyness of the alkyl group, leading to a decrease in the effective conjugation and planarity. They
both had distinctive &pi / -&pi / * transitions, band structure and backbone that provides oxidative doping. P1,
with the shorter alkyl chain had a lower oxidation potential than P2. Neither of the polymers was
capable of being n-doped. They were both multichromic, revealing colors from neutral state green to
doped state blue.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12615382/index.pdf |
| Date | 01 January 2013 |
| Creators | Namal, Imge |
| Contributors | Toppare, Levent |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for METU campus |
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