Excitonic coupling strength and coherence length in the singlet and triplet excited states of meso-meso directly linked Zn(II)porphyrin arrays

Jeong Hyon Ha, Hyun Sun Cho, Jae Kyu Song, Dongho Kim, Naoki Aratani, Atsuhiro Osuka

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Excitation-energy transport (EET) phenomena in meso - meso directly linked Zn(II)porphyrin arrays in the singlet and triplet excited states were investigated with a view to electronic coupling strength and coherence length by steady-state and time-resolved spectroscopic measurements. To investigate energy transfer in the triplet states, we modified the Zn(II)porphyrin arrays with bromo substituents at both ends. The coupling strength of the Soret bands of the arrays was estimated to be about 2200 cm-1, and that of the Q bands is about 570 cm-1. The coherence length in the S1 state of the Zn(II)porphyrin arrays was determined to be 4-5 porphyrin units, which is comparable to that of the well-ordered two-dimensional circular structure B850 in the peripheral light-harvesting antenna (LH2) in photosynthetic purple bacteria. This indicates that the Zn(II)porphyrin arrays are well suited for mimicking natural light-harvesting antenna complexes. On the other hand, the rate of energy transfer in the triplet state is estimated to be on the order of 100 μs-1, and the very weak coupling between the triplet states (ca. 0.003 cm-1), indicates that the triplet excitation energy is essentially localized on a single porphyrin moiety.

Original languageEnglish
Pages (from-to)57-67
Number of pages11
JournalChemPhysChem
Volume5
Issue number1
DOIs
Publication statusPublished - 2004 Jan 23

Fingerprint

Porphyrins
Excited states
porphyrins
atomic energy levels
excitation
Excitation energy
Energy transfer
Light-Harvesting Protein Complexes
antennas
energy transfer
bacteria
Antennas
energy
electronics

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

Ha, Jeong Hyon ; Cho, Hyun Sun ; Song, Jae Kyu ; Kim, Dongho ; Aratani, Naoki ; Osuka, Atsuhiro. / Excitonic coupling strength and coherence length in the singlet and triplet excited states of meso-meso directly linked Zn(II)porphyrin arrays. In: ChemPhysChem. 2004 ; Vol. 5, No. 1. pp. 57-67.
@article{58bf9c3d04224c15b21bc5b7336f2f46,
title = "Excitonic coupling strength and coherence length in the singlet and triplet excited states of meso-meso directly linked Zn(II)porphyrin arrays",
abstract = "Excitation-energy transport (EET) phenomena in meso - meso directly linked Zn(II)porphyrin arrays in the singlet and triplet excited states were investigated with a view to electronic coupling strength and coherence length by steady-state and time-resolved spectroscopic measurements. To investigate energy transfer in the triplet states, we modified the Zn(II)porphyrin arrays with bromo substituents at both ends. The coupling strength of the Soret bands of the arrays was estimated to be about 2200 cm-1, and that of the Q bands is about 570 cm-1. The coherence length in the S1 state of the Zn(II)porphyrin arrays was determined to be 4-5 porphyrin units, which is comparable to that of the well-ordered two-dimensional circular structure B850 in the peripheral light-harvesting antenna (LH2) in photosynthetic purple bacteria. This indicates that the Zn(II)porphyrin arrays are well suited for mimicking natural light-harvesting antenna complexes. On the other hand, the rate of energy transfer in the triplet state is estimated to be on the order of 100 μs-1, and the very weak coupling between the triplet states (ca. 0.003 cm-1), indicates that the triplet excitation energy is essentially localized on a single porphyrin moiety.",
author = "Ha, {Jeong Hyon} and Cho, {Hyun Sun} and Song, {Jae Kyu} and Dongho Kim and Naoki Aratani and Atsuhiro Osuka",
year = "2004",
month = "1",
day = "23",
doi = "10.1002/cphc.200300758",
language = "English",
volume = "5",
pages = "57--67",
journal = "ChemPhysChem",
issn = "1439-4235",
publisher = "Wiley-VCH Verlag",
number = "1",

}

Excitonic coupling strength and coherence length in the singlet and triplet excited states of meso-meso directly linked Zn(II)porphyrin arrays. / Ha, Jeong Hyon; Cho, Hyun Sun; Song, Jae Kyu; Kim, Dongho; Aratani, Naoki; Osuka, Atsuhiro.

In: ChemPhysChem, Vol. 5, No. 1, 23.01.2004, p. 57-67.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Excitonic coupling strength and coherence length in the singlet and triplet excited states of meso-meso directly linked Zn(II)porphyrin arrays

AU - Ha, Jeong Hyon

AU - Cho, Hyun Sun

AU - Song, Jae Kyu

AU - Kim, Dongho

AU - Aratani, Naoki

AU - Osuka, Atsuhiro

PY - 2004/1/23

Y1 - 2004/1/23

N2 - Excitation-energy transport (EET) phenomena in meso - meso directly linked Zn(II)porphyrin arrays in the singlet and triplet excited states were investigated with a view to electronic coupling strength and coherence length by steady-state and time-resolved spectroscopic measurements. To investigate energy transfer in the triplet states, we modified the Zn(II)porphyrin arrays with bromo substituents at both ends. The coupling strength of the Soret bands of the arrays was estimated to be about 2200 cm-1, and that of the Q bands is about 570 cm-1. The coherence length in the S1 state of the Zn(II)porphyrin arrays was determined to be 4-5 porphyrin units, which is comparable to that of the well-ordered two-dimensional circular structure B850 in the peripheral light-harvesting antenna (LH2) in photosynthetic purple bacteria. This indicates that the Zn(II)porphyrin arrays are well suited for mimicking natural light-harvesting antenna complexes. On the other hand, the rate of energy transfer in the triplet state is estimated to be on the order of 100 μs-1, and the very weak coupling between the triplet states (ca. 0.003 cm-1), indicates that the triplet excitation energy is essentially localized on a single porphyrin moiety.

AB - Excitation-energy transport (EET) phenomena in meso - meso directly linked Zn(II)porphyrin arrays in the singlet and triplet excited states were investigated with a view to electronic coupling strength and coherence length by steady-state and time-resolved spectroscopic measurements. To investigate energy transfer in the triplet states, we modified the Zn(II)porphyrin arrays with bromo substituents at both ends. The coupling strength of the Soret bands of the arrays was estimated to be about 2200 cm-1, and that of the Q bands is about 570 cm-1. The coherence length in the S1 state of the Zn(II)porphyrin arrays was determined to be 4-5 porphyrin units, which is comparable to that of the well-ordered two-dimensional circular structure B850 in the peripheral light-harvesting antenna (LH2) in photosynthetic purple bacteria. This indicates that the Zn(II)porphyrin arrays are well suited for mimicking natural light-harvesting antenna complexes. On the other hand, the rate of energy transfer in the triplet state is estimated to be on the order of 100 μs-1, and the very weak coupling between the triplet states (ca. 0.003 cm-1), indicates that the triplet excitation energy is essentially localized on a single porphyrin moiety.

UR - http://www.scopus.com/inward/record.url?scp=2442494834&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2442494834&partnerID=8YFLogxK

U2 - 10.1002/cphc.200300758

DO - 10.1002/cphc.200300758

M3 - Article

C2 - 14999844

AN - SCOPUS:2442494834

VL - 5

SP - 57

EP - 67

JO - ChemPhysChem

JF - ChemPhysChem

SN - 1439-4235

IS - 1

ER -