2010 Fiscal Year Final Research Report
Macromolecular semiconductors designed based on the higher-order structure and intramolecular potential gradient
| Project/Area Number |
21750152
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Functional materials chemistry
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| Research Institution | Keio University |
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Principal Investigator |
IMAOKA Takane Keio University, 資源科学研究所, 助教 (80398635)
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| Project Period (FY) |
2009 – 2010
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| Keywords | 分子素子 |
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| Research Abstract |
Dendrimers having a zinc porphyrin core and naphthalenediimide termini were examined. The charge-recombination reaction attenuated from 3.1×10^6(s^<-1>) to 0.45×10^6(s^<-1>) with the generation number increase from 1 to 4. In contrast, the charge-separation reaction unexpectedly increased from 0.2×10^9 (s^<-1>) to 0.45×10^9 (s^<-1>). These results are explained as the result of mediated electron transfer through the π-bonds with a potential down gradient.
To determine the effect of the potential gradient, phenylenevinylene dendrimers with no gradient were also studied. A DFT (B3LYP/6-31G) calculation showed an electron gradient only induced in the phenylazomethine dendrimer, which has heteroatoms (nitrogen) and rigid-π-conjugating backbones. The phenylazomethine dendrimer showed an asymmetric character of the electro transfer, In contrast, the phenylenevinylene dendrimer did not show such character in their electron transfer reactions.
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