Photochemistry of covalently-linked multi-porphyrinic systems

Aratani, Naoki; Osuka, Atsuhiro; Cho, Hyun Sun; Kim, Dongho

doi:10.1016/s1389-5567(02)00003-5

Cited by 141 publications

(84 citation statements)

References 101 publications

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“…Emission spectrum with photoexcitation at 405 nm shows relatively strong S2 fluorescence similar to other mesosubstituted Zn II porphyrins. [16][17][18][19][20][21][22]24,25 From the absorption and emission spectra, the Stokes-shift was estimated to be about 630 cm −1 , which is quite similar to that of Zn Femtosecond pump-probe spectroscopy gives a direct insight into the dynamics of coherent wave packet motions and subsequent vibronic relaxation processes of molecules in the condensed phase. [1][2][3][4][5][6][7][8] We have studied impulsively photoinduced vibrational coherent motions in the electronic ground and excited states of Zn II DPP.…”

Section: Resultsmentioning

confidence: 96%

“…28,29 This band is always strongly activated by the B-band excitation in the RR spectrum due to the π-π* transition of porphyrin macrocycle. 10,[16][17][18][19][20] Since these two normal modes involve relatively large vibrational motions of porphyrin ring, their intensities would be strong due to a large change in polarizability. In the previous result on Zn II TPP, however, the φ 10 mode is weakly enhanced presumably due to the contribution of pure phenyl translation motion without porphyrin ring vibration.…”

Section: -10mentioning

confidence: 99%

“…[13][14][15] Among these, porphyrins are one of the most attractive building block elements due to their desirable molecular characteristics such as rigid planar geometry, high stability, intense electronic absorption, and small HOMO-LUMO energy gap, as well as flexible tunability of their optical and redox properties by appropriate metalation. [16][17][18] Thus it is indispensable to have a deep understanding into the excited states of porphyrin molecules in various forms of molecular photonic wires, because the light signal transmission is based on the excitation energy transfer in the excited states of porphyrin molecules. [19][20][21] In this work, we present time-resolved spectroscopic data on Zn(II)-5,15-diphenylporphyrin (Zn II DPP) in toluene such as pump-probe transient absorption, coherent vibrational oscillations, and RR spectra.…”

Section: Introductionmentioning

confidence: 99%

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Femtosecond Coherent Spectroscopic Study of Zn(II)porphyrin Using Chirped Ultrashort Pulses

2003

Bulletin of the Korean Chemical Society

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We have investigated femtosecond coherent vibrational motions of Zn(II)-5,15-diphenylporphyrin in toluene using chirp-controlled ultrashort pulses. The oscillatory features superimposed on the temporal profiles of the pump-probe transient absorption signal are affected by the chirping and energy of excitation pulses. Using chirp-and excitation energy-controlled femtosecond pulses, we are able to obtain information on the structural changes between the electronic ground and excited states based on a comparative analysis of the Fouriertransformed frequency-domain spectra retrieved from the oscillatory components with the ground state resonance Raman spectra and normal mode calculations.

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Section: Resultsmentioning

confidence: 96%

Section: -10mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Femtosecond Coherent Spectroscopic Study of Zn(II)porphyrin Using Chirped Ultrashort Pulses

2003

Bulletin of the Korean Chemical Society

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“…Various types of covalently linked arrays of metallo porphyrins have been designed and synthesized with the goal of applying these molecular oligomers to molecular photonic devices [26,52,[59][60][61][62] as artificial light-harvesting systems [34,[62][63][64][65]. Among them, meso-meso linked porphyrinic arrays have been emerged as an interesting candidate for exploring the artificial photosynthetic reaction centers and light harvesting antenna complexes (Figure 1).…”

Section: Meso-meso Linked Porphyrin Arraysmentioning

confidence: 99%

Meso-Linked Multiporphyrins as Model for Light Harvesting Systems: Review

Singhal¹

2017

Nat Prod Chem Res

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Nature has always been the fundamental source of inspiration for researchers to understand the complex biological functions. Photosynthesis is among the important natural phenomena and hence, gained interest towards developing the artificial photosynthetic reaction centers. Electron and energy transfer process between various porphyrin units within the multiporphyrin arrays is the important key in developing such systems. Long duration of charge separated state and spectral coverage scope of the accepting porphyrin units are another important factor that contribute to an efficient mimic of the photosynthetic reaction center. Meso-linked porphyrin architectures provide a great aspect in this regard because of short inter-porphyrinic distance with optimal dihedral angle. The present review highlights the design of various kinds of meso-linked multiporphyrins and study of electron and energy transfer processes between them that serve as an efficient model for light harvesting systems.

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“…On the other hand, Osuka and coworkers have introduced new oligoporphyrin arrays in which the porphyrin rings are either linked by single bonds in a biaryl-type fashion or triply fused under generation of porphyrin sheets with exceptional electronic properties [79][80][81]. Combining fullerenes with these novel oligoporphyrins, we prepared and investigated the series of conjugates 13a-c and 14 ( Fig.…”

Section: Extended Porphyrin-fullerene Conjugatesmentioning

confidence: 99%

Advanced Optoelectronics Materials by Fullerene and Acetylene Scaffolding

Diederich

2006

ChemInform

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Functional π-systems with unusual opto-electronic properties are intensively investigated from both fundamental research and technological application viewpoints. This article reports on novel π-conjugated systems obtained by acetylenic and fullerene scaffolding. Linearly conjugated acetylenic nanorods, consisting of monodisperse poly(triacetylene) (PTA) oligomers and extending up to 18 nm length, were prepared to investigate the limits of effective conjugation and to explore at which length a monodisperse oligomer reaches the properties of an infinite polydisperse polymer. With the cyanoethynylethenes (CEEs), a powerful new class of electron acceptors is introduced that undergo intense intramolecular charge-transfer (CT) interactions with appended donors. Macrocyclic scaffolds with unusual opto-electronic properties are perethynylated dehydroannulenes, expanded radialenes, and radiaannulenes bearing peripheral dialkylanilino donor groups. Extended porphyrin-fullerene conjugates are investigated for their novel photophysical and efficient multicharge storage properties. Self-assembly of fullerenes and porphyrins, governed by weak interactions between the two components, leads to unprecedented nanopatterned surfaces that are investigated by scanning tunneling microscopy (STM).

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Photochemistry of covalently-linked multi-porphyrinic systems

Cited by 141 publications

References 101 publications

Femtosecond Coherent Spectroscopic Study of Zn(II)porphyrin Using Chirped Ultrashort Pulses

Femtosecond Coherent Spectroscopic Study of Zn(II)porphyrin Using Chirped Ultrashort Pulses

Meso-Linked Multiporphyrins as Model for Light Harvesting Systems: Review

Advanced Optoelectronics Materials by Fullerene and Acetylene Scaffolding

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