Effects of Magnetic Fields on the Relaxation Processes of Photoexcited Oordination Compounds.
| Project/Area Number |
61470043
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機・錯塩・放射化学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
KAIZU Youkoh Associate Professor, Department of Chemistry, Tokyo Institute of Technology, 理学部, 助教授 (20016140)
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| Co-Investigator(Kenkyū-buntansha) |
OHNO Osamu Associate, Department of Chemistry, Tokyo Institute of Technology, 理学部, 助手 (30185342)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1987: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1986: ¥5,200,000 (Direct Cost: ¥5,200,000)
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| Keywords | Porphyrin hybrid dimer / Intramolecular energy transfer / TT annihilation / T-T吸収 / エネルギー移動 |
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| Research Abstract |
Energy transfer from the excited triplet (trip-doublet and trip-quartet) state of copper porphyrin to the lowest excited triplet state of its free-base partner was detected by measurements of T-T transient absorption of a -(CH_2)_3- covalently linked porphyrin dimer. The excited dimer with free-base in the excited singlet is partly quenched by the copper counterpart. Oh the other p hand, the excited dimer with copper orphyrin in the trip-multiplet state is dissipated not only by the bast electronic relaxation within the copper porphyrin but also the intramolecular energy transfer to the free-base partner.
The S_1 and S_2 delayed fluorescences were observed at om temperature with some diamagnetic metalloterraphenylporphins. The intensities and the decay-reat constants of the delayed fluorescences decreased in the presence of an external magnetic field. The same magnetic effects were observed on the S_1 and S_2 delayed fluorescences. These uesults indicate that highly energetic states (S_n, n<greater than or equal> is created by TT annihilation and give rise to the repopulation of S_1 and s_2 states.
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Report
(2 results)
Research Products
(9 results)
