Synthesis, optical, electrochemical, and thermal properties of α,α′-bis(9,9-bis-n-hexylfluorenyl)-substituted oligothiophenes |
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Authors: | Vinich Promarak Auradee Punkvuang Siriporn Jungsuttiwong Sayant Saengsuwan Taweesak Sudyoadsuk Tinnagon Keawin |
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Affiliation: | Advanced Organic Materials and Devices Laboratory, Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Warinchumrap, Ubon Ratchathani 34190, Thailand |
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Abstract: | A series of new α,α′-bis(9,9-bis-n-hexylfluorenyl)-substituted oligothiophenes with 2-, 4-, and 6-thiophene rings have been synthesized via a nickel-catalyzed reductive dimerization and their optical, electrochemical, and thermal properties investigated. The fluorene substituents have shown electronic interactions with the oligothiophene chains, enhanced the solubility of these materials and stabilized the radical cation and dication by blocking the reactive α-positions of the thiophene moieties. The absorption, fluorescence, electrochemical, and thermal properties of these materials can be tuned by varying the conjugation length of the oligothiophene segment. |
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Keywords: | Thiophene Fluorene Nickel-catalyzed coupling Oligomer Electrochemical property Organic light-emitting diode (OLED) |
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