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• W2028719314 endingPage "3298" @default.
• W2028719314 startingPage "3287" @default.
• W2028719314 abstract "A variety of porphyrin arrays connected together with different linkage were devised for possible applications to molecular optoelectronic devices such as wires, logic gates, and artificial light-harvesting arrays, etc. It has been relatively well established that the light signal transmission in these molecular assemblies is based on exciton migration process, which possibly gives rise to the structural changes during the exciton delocalization process. Zinc(II) 5,15-di(3,5-di-tert-butylphenyl)porphyrin (Z1), its directly meso,meso-linked porphyrin dimer (Z2), trimer (Z3), and tetramer (Z4) were synthesized with the goal to elucidate the relationship between exciton migration and structural change upon photoexcitation. One of the most important factors in structural changes for these porphyrin arrays is mainly determined by the dihedral angle between adjacent porphyrin moieties. For a systematic approach toward the investigation of the exciton coupling dynamics influenced by the relative orientation between neighboring porphyrin molecules, various time-resolved spectroscopic techniques such as fluorescence decay and transient absorption measurements with different polarization in pump/probe beams have been utilized. The steady-state excitation anisotropy spectra of Z2, Z3, and Z4 porphyrin arrays show that the photoexcitation of the high-energy exciton Soret band induces a large angle change between absorption and emission dipoles in contrast with the photoexcitation of the low-energy exciton split Soret and Q-bands. In the order of Z1, Z2, Z3, and Z4, their S1 states decay faster because of the increasing energy dissipation processes into a larger number of accessible states. In contrast, the rotational diffusion rates become slower in the same order because the overall molecular shape is elongated along the long axis of the molecular arrays, which experiences a large displacement of solvent molecules in rotational diffusion motion. Ultrafast fluorescence decay measurements show that the S2 → S1 internal conversion process occurs in less than 1 ps in Z2, Z3, and Z4 due to the existence of exciton split band as a ladder-type deactivation channel, while this process is relatively slow in Z1 (∼1.6 ps). Femtosecond transient absorption experiments with magic angle and different polarization in probe beam were performed to find the relationship between energy relaxation and anisotropy dynamics upon photoexcitation. The internal conversion in Z2, Z3, and Z4 is likely to be accompanied by the incoherent energy hopping processes occurring in less than ∼200 fs judging from a large change in the anisotropy value in the transient absorption decay. In addition, the decay components with approximately 8 ps time constant were observed in both fluorescence up-conversion and femtosecond transient absorption decays. These components are believed to arise from the conformational change in the excited states, because the dihedral angle distribution in these arrays was estimated to be 90° ± 20° at ambient temperature from the AM1 calculation." @default.
• W2028719314 created "2016-06-24" @default.
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• W2028719314 date "2000-03-29" @default.
• W2028719314 modified "2023-10-16" @default.
• W2028719314 title "Ultrafast Energy Relaxation Dynamics of Directly Linked Porphyrin Arrays" @default.
• W2028719314 cites W1916260872 @default.
• W2028719314 cites W1965796549 @default.
• W2028719314 cites W1969270244 @default.
• W2028719314 cites W1972229055 @default.
• W2028719314 cites W1972558136 @default.
• W2028719314 cites W1974038678 @default.
• W2028719314 cites W1975975067 @default.
• W2028719314 cites W1980008056 @default.
• W2028719314 cites W1980060401 @default.
• W2028719314 cites W1980660674 @default.
• W2028719314 cites W1980885037 @default.
• W2028719314 cites W1984874582 @default.
• W2028719314 cites W1987493949 @default.
• W2028719314 cites W1989107097 @default.
• W2028719314 cites W1990671647 @default.
• W2028719314 cites W1994265659 @default.
• W2028719314 cites W1994793493 @default.
• W2028719314 cites W1995515743 @default.
• W2028719314 cites W2003156327 @default.
• W2028719314 cites W2005784528 @default.
• W2028719314 cites W2007700073 @default.
• W2028719314 cites W2009379246 @default.
• W2028719314 cites W2011100513 @default.
• W2028719314 cites W2011772995 @default.
• W2028719314 cites W2013434127 @default.
• W2028719314 cites W2013921710 @default.
• W2028719314 cites W2019917592 @default.
• W2028719314 cites W2020680181 @default.
• W2028719314 cites W2025511457 @default.
• W2028719314 cites W2028354544 @default.
• W2028719314 cites W2030346842 @default.
• W2028719314 cites W2030709474 @default.
• W2028719314 cites W2031487394 @default.
• W2028719314 cites W2033618050 @default.
• W2028719314 cites W2038284353 @default.
• W2028719314 cites W2038524052 @default.
• W2028719314 cites W2040819805 @default.
• W2028719314 cites W2041246643 @default.
• W2028719314 cites W2041615720 @default.
• W2028719314 cites W2042737668 @default.
• W2028719314 cites W2042896064 @default.
• W2028719314 cites W2046330812 @default.
• W2028719314 cites W2047431695 @default.
• W2028719314 cites W2047538874 @default.
• W2028719314 cites W2048313475 @default.
• W2028719314 cites W2048603961 @default.
• W2028719314 cites W2049991844 @default.
• W2028719314 cites W2050560750 @default.
• W2028719314 cites W2052342113 @default.
• W2028719314 cites W2053128272 @default.
• W2028719314 cites W2053170334 @default.
• W2028719314 cites W2054402215 @default.
• W2028719314 cites W2054947925 @default.
• W2028719314 cites W2054978825 @default.
• W2028719314 cites W2055584480 @default.
• W2028719314 cites W2055975732 @default.
• W2028719314 cites W2057257702 @default.
• W2028719314 cites W2060049053 @default.
• W2028719314 cites W2064405512 @default.
• W2028719314 cites W2064451446 @default.
• W2028719314 cites W2064582942 @default.
• W2028719314 cites W2064850136 @default.
• W2028719314 cites W2066220267 @default.
• W2028719314 cites W2066466225 @default.
• W2028719314 cites W2066506937 @default.
• W2028719314 cites W2067099256 @default.
• W2028719314 cites W2068171231 @default.
• W2028719314 cites W2068494758 @default.
• W2028719314 cites W2070966771 @default.
• W2028719314 cites W2071341559 @default.
• W2028719314 cites W2073341835 @default.
• W2028719314 cites W2073376629 @default.
• W2028719314 cites W2073564343 @default.
• W2028719314 cites W2073571812 @default.
• W2028719314 cites W2075170187 @default.
• W2028719314 cites W2082359214 @default.
• W2028719314 cites W2082719644 @default.
• W2028719314 cites W2083419951 @default.
• W2028719314 cites W2084909057 @default.
• W2028719314 cites W2085303212 @default.
• W2028719314 cites W2086887678 @default.
• W2028719314 cites W2088132599 @default.
• W2028719314 cites W2091420956 @default.
• W2028719314 cites W2091839606 @default.

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