S2 .fwdarw. S0 fluorescence of some metallotetraphenylporphyrins

Kurabayashi, Yutaka; Kikuchi, Kôichi; Kokubun, Hiroshi; Kaizu, Youkoh; Kobayashi, Hiroshi

doi:10.1021/j150651a013

Cited by 79 publications

(52 citation statements)

References 3 publications

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“…The shorter S2 lifetime in free base porphin has been interpreted in terms of nonradiative transition. Since the large frequency of the N-H stretching vibration may act as an accepting mode of the electronic excitation energy from the S2 state, the S2 lifetime of free base porphin is very short [29]. In contrast, no central N-H bond exists in metalloporphyrins and N-metal bond has lower vibrational frequencies, which may be responsible for relatively larger S2 fluorescence quantum yield and few ps lifetime in the S2 state.…”

Section: Resultsmentioning

confidence: 99%

Time-Resolved and Near-Field Scanning Optical Microscopy Study on Porphyrin J-Aggregate

Miura

Matsumura

et al. 1998

Acta Phys. Pol. A

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Water-soluble porphyrin, 5,10,1 5,20-tetraphenyl-21Η,23Η-paorpahiυe-tetrasulfonic acid (TPPS), forms J-aggregate in aqueous solution depending on experimental conditions such as pH, dye concentration, and/or ionic strength. The steady-state fluorescence and picosecond single-photon timing spectroscopy were applied for protonated monomer and J-aggregate in aqueous solution and in thin films to reveal the dynamics in the S2 and S1 states. . The S2 fluorescence spectra from the protonated monomer and J-aggregate were observed in addition to the normal S 1 fluorescence. The lifetime of the S2 state was estimated to be 5 ps for J-aggregate, whereas the lifetime is shorter than 1 ps for protonated TPPS monomer. The mesoscopic structures of J-aggregate in thin film with and without polymer on the glass surface were examined by scanning near-field optical microscopy. With the surface topography and scanning near-field optical microscopy transmission images, TPPS J-aggregate was found to form a long and narrow tube-like structure which has a few μm length, 0.2-0.5 μm width, and 5-30 nm height. An unidirectional orientation of the structure was also found, which may be originated from the spin-coating process.

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Section: Resultsmentioning

confidence: 99%

Time-Resolved and Near-Field Scanning Optical Microscopy Study on Porphyrin J-Aggregate

Miura

Matsumura

et al. 1998

Acta Phys. Pol. A

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“…9,10 The fluorescence quantum yields and lifetimes were estimated to be 10 Ϫ3 -10 Ϫ4 and about 3 ps, respectively. 11,12 The low fluorescence quantum yields of the S 2 state has been explained with electron transfer and IC processes. However, the internal conversion process has not been revealed in detail both for the metal free and for the metallo-porphyrins and phthalocyanines.…”

Section: Introductionmentioning

confidence: 99%

The ultrafast intramolecular dynamics of phthalocyanine and porphyrin derivatives

Zhong

Wang

Liu

et al. 1996

The Journal of Chemical Physics

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The internal conversion and intramolecular vibrational relaxation processes of nitro-tri-tert-butylphthalocyanine, tetra-phenylporphyrin ͑TPP͒, and tetra-tert-butylphthalocyanine ͑BuPc͒ in chloroform solution were investigated with an ultrafast time-resolved fluorescence depletion method. A regular fluorescence depletion was observed, indicating that the vibrational relaxation in the S 1 state takes a few hundred femtoseconds to several picoseconds. For TPP and BuPc, an additional sharp dip superposes on the regular depletion. It is explained by an ultrafast internal conversion process from the S 2 state to the S 1 state with a time of a few tens of femtoseconds.

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“…8a)) due to fast relaxation of electrons from S 2 to S 1 levels. However, S 2 →S 0 emission was observed in Zn(II)TPP, Al(III)TPP(OH) in non polar solutions [33]. The appearance of S 2 →S 0 emission in the glass further confirms the perturbation of porphyrin central core through boron bonding in the glass matrix.…”

Section: Steady State Fluorescence Emissionmentioning

confidence: 75%

Spectroscopic and dielectric studies of meso-tetrakis(p-sulfonatophenyl) porphyrin doped hybrid borate glasses

Venkatramaiah

Veeraiah

Venkatesan

2011

Journal of Alloys and Compounds

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S2 .fwdarw. S0 fluorescence of some metallotetraphenylporphyrins

Cited by 79 publications

References 3 publications

Time-Resolved and Near-Field Scanning Optical Microscopy Study on Porphyrin J-Aggregate

Time-Resolved and Near-Field Scanning Optical Microscopy Study on Porphyrin J-Aggregate

The ultrafast intramolecular dynamics of phthalocyanine and porphyrin derivatives

Spectroscopic and dielectric studies of meso-tetrakis(p-sulfonatophenyl) porphyrin doped hybrid borate glasses

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