2013 Fiscal Year Final Research Report
Development of Highly Efficient Direct Arylation Catalysts for Precisely Controlled Synthesis of pi-Conjugated Polymers
| Project/Area Number |
23350042
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Synthetic chemistry
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
WAKIOKA Masayuki 京都大学, 化学研究所, 助教 (50598844)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 直接的アリール化 / パラジウム触媒 / 触媒機構 / π共役系高分子 |
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| Research Abstract |
We have developed highly efficient palladium catalysts for direct arylation polymerization (DArP) of aryl halides and heteroarenes to afford pi-conjugated polymers, which have found wide application in optoelectronic devices such as photovoltaic cells and field-effect transistors. The catalytic mechanism has been explored by kinetic experiments and DFT calculations using a presumed intermediate of the formula [PdAr(OAc)L]. This complex has a large propensity to be aggregated into a dimer or tetramer, which is inert to direct arylation. It has been found that the use of P(o-MeOC6H4)3 (L1) as L effectively control the aggregation, thereby leading to highly active catalysis. Thus, in the presence of catalytic amounts of palladium precursor and L1 (1 mol%), several kinds of dibromoarenes are successfully coupled with 2,3,5,6-tetrafluorobenzene or thieno[3,4-c]pyrrole-4,6-dione to form donor-acceptor type pi-conjugated polymers with high molecular weights in almost quantitative yields.
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Research Products
(28 results)
