| Project/Area Number |
18550133
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials chemistry
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| Research Institution | Kinki University |
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Principal Investigator |
MATSUBARA Yoshio Kinki University, Faculty of Science Engineering, Professor (80088450)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,950,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2007: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2006: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Strong fluorophores / Donor group / Acceptor group / Cross type / Electron conjugated system / Core part in the center / Photophysical data |
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| Research Abstract |
In this study, creation of strong fluorescence material was carried out by the constriction of π-electron conjugation system forming core part in the center, arm part having electron donor or acceptor group in four direction, and result were discussed with photophysicochemically. The design of emitted cross shaped tetrakis(phenyletylnyl)benzenes: The cross types of electron conjugative ability was advantageous than a straight line type by the investigation of HOMO-LUMO gap using AM1 calculation. Thus, compounds 1-4 were designed and synthesized. Compounds 1-4 by the reaction of halogenated 1, 4-disubstituted-benzene(core part) with p-substituted phenyl ethynyl (arm part) were synthesized using sonogashira cross coupling reaction. Photophysical data of cross shaped tetrakis(phenylethynyl)benzenes were summarized. Absorption(λ_<abs>) and absorbancy (log ε) were increase in order of non-substitution compound(1) < electron donor(core) compound(2) < electron acceptor(side arms) compound(3) < electron donor(core)/acceptor(side arms) compound(4) and emission wavelength(λ_<em>) were red-shifted above orders. The fluorescence quantum yields (Φ_f) also greatly go up by the introducing the electronic donor acceptor group . The compound 1, 2, 3 and 4 increase the k_r values, and decrease the k_d values. Relationship exists between Φ_f and kinetic parameters for the radiative and radiationless process were examined. ΔΔS^‡=ΔS_r^‡-ΔS_d^‡=1n k_r/k_d
A nice liner relationship between Φ_f and ΔΔS^‡(Φ_f= 0.092ΔΔS^‡+ 0.520). It is inferred that ΔΔS^‡ might be a measure for α-conjugation of the molecules at the exited singlet state.
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