Symmetry-breaking charge transfer in the excited state of directly linked push-pull porphyrin arrays

Herein, we revealed a symmetry-breaking charge transfer (SBCT) process in the excited state of a directly linked push-pull porphyrin dyad (AD) and triad (ADA) via spectroscopic measurements including steady-state absorption and fluorescence, time-resolved fluorescence (TRF), femtosecond transient ab...

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Published in:Physical chemistry chemical physics : PCCP 2017, Vol.19 (21), p.13970-13977
Main Authors: Kim, Taeyeon, Kim, Jinseok, Mori, Hirotaka, Park, Seongchul, Lim, Manho, Osuka, Atsuhiro, Kim, Dongho
Format: Article
Language:English
Subjects:
Absorption
Arrays
Charge transfer
Femtosecond
Fluorescence
Porphyrins
Solvents
Spectra
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cited_by cdi_FETCH-LOGICAL-c427t-305d4b0dfbdc188479c8ba61b8c7f606e8451c3e967ca86f2357e334002cfe93
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container_end_page 13977
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container_title Physical chemistry chemical physics : PCCP
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creator Kim, Taeyeon
Kim, Jinseok
Mori, Hirotaka
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Kim, Dongho
description Herein, we revealed a symmetry-breaking charge transfer (SBCT) process in the excited state of a directly linked push-pull porphyrin dyad (AD) and triad (ADA) via spectroscopic measurements including steady-state absorption and fluorescence, time-resolved fluorescence (TRF), femtosecond transient absorption (fs-TA), and time-resolved infrared (TRIR) measurements. Unprecedented broad fluorescence spectra were observed for porphyrin arrays in polar solvents; these were attributed to the existence of a charge transfer state as evidenced by the TRF measurements. TA measurements also revealed emerging features of a CT state for AD and ADA in polar solvents. These dynamics were also confirmed via TRIR measurements, which provided further information on the solvation and structural relaxation processes of the SBCT process. This is the first observation of an SBCT process in porphyrin arrays, providing fundamental understanding of the strongly coupled porphyrin arrays. Thus, the results of this study reveal the potential of the porphyrin arrays in relevant applications requiring SBCT.
doi_str_mv 10.1039/c7cp01943b
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subjects Absorption
Arrays
Charge transfer
Femtosecond
Fluorescence
Porphyrins
Solvents
Spectra
title Symmetry-breaking charge transfer in the excited state of directly linked push-pull porphyrin arrays
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