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Acceptor Side-Chain Effects on the Excited State Dynamics of Two-Dimensional-Like Conjugated Copolymers in Solution

Excited state dynamics of two-dimensional-like conjugated copolymers PFDCN and PFSDCN based on alternating fluorene and triphenylamine main chains and malononitrile pendant acceptor groups with thiophene as π-bridge, have been investigated by using transient absorption spectroscopy. There is an addi...

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Autores principales: Huo, Ming-Ming, Hu, Rong, Yan, Wei, Wang, Yi-Tong, Chee, Kuan W. A., Wang, Yong, Zhang, Jian-Ping
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6151795/
https://www.ncbi.nlm.nih.gov/pubmed/28841145
http://dx.doi.org/10.3390/molecules22091398
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author Huo, Ming-Ming
Hu, Rong
Yan, Wei
Wang, Yi-Tong
Chee, Kuan W. A.
Wang, Yong
Zhang, Jian-Ping
author_facet Huo, Ming-Ming
Hu, Rong
Yan, Wei
Wang, Yi-Tong
Chee, Kuan W. A.
Wang, Yong
Zhang, Jian-Ping
author_sort Huo, Ming-Ming
collection PubMed
description Excited state dynamics of two-dimensional-like conjugated copolymers PFDCN and PFSDCN based on alternating fluorene and triphenylamine main chains and malononitrile pendant acceptor groups with thiophene as π-bridge, have been investigated by using transient absorption spectroscopy. There is an additional conjugated –C=C– bond in PFDCN, which distinguishes it from PFSDCN. The lowest energy absorption band of each copolymer absorption spectrum is attributed to the π−π* transition with intramolecular charge-transfer, which has a lower fluorescence contribution than those of higher energy absorption bands. The optical excitation of either PFDCN or PFSDCN solution generates polaron pairs that then self-localize and evolve to a bound singlet exciton within a few picoseconds. Due to the additional conjugated –C=C– bond in the acceptor side-chain, PFDCN has a stronger intramolecular charge-transfer characteristic compared with PFSDCN, therefore exhibiting a longer self-localization time (7 ps vs. 3 ps for PFSDCN) and a shorter fluorescence lifetime (1.48 ns vs. 1.60 ns for PFSDCN).
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spelling pubmed-61517952018-11-13 Acceptor Side-Chain Effects on the Excited State Dynamics of Two-Dimensional-Like Conjugated Copolymers in Solution Huo, Ming-Ming Hu, Rong Yan, Wei Wang, Yi-Tong Chee, Kuan W. A. Wang, Yong Zhang, Jian-Ping Molecules Article Excited state dynamics of two-dimensional-like conjugated copolymers PFDCN and PFSDCN based on alternating fluorene and triphenylamine main chains and malononitrile pendant acceptor groups with thiophene as π-bridge, have been investigated by using transient absorption spectroscopy. There is an additional conjugated –C=C– bond in PFDCN, which distinguishes it from PFSDCN. The lowest energy absorption band of each copolymer absorption spectrum is attributed to the π−π* transition with intramolecular charge-transfer, which has a lower fluorescence contribution than those of higher energy absorption bands. The optical excitation of either PFDCN or PFSDCN solution generates polaron pairs that then self-localize and evolve to a bound singlet exciton within a few picoseconds. Due to the additional conjugated –C=C– bond in the acceptor side-chain, PFDCN has a stronger intramolecular charge-transfer characteristic compared with PFSDCN, therefore exhibiting a longer self-localization time (7 ps vs. 3 ps for PFSDCN) and a shorter fluorescence lifetime (1.48 ns vs. 1.60 ns for PFSDCN). MDPI 2017-08-25 /pmc/articles/PMC6151795/ /pubmed/28841145 http://dx.doi.org/10.3390/molecules22091398 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Huo, Ming-Ming
Hu, Rong
Yan, Wei
Wang, Yi-Tong
Chee, Kuan W. A.
Wang, Yong
Zhang, Jian-Ping
Acceptor Side-Chain Effects on the Excited State Dynamics of Two-Dimensional-Like Conjugated Copolymers in Solution
title Acceptor Side-Chain Effects on the Excited State Dynamics of Two-Dimensional-Like Conjugated Copolymers in Solution
title_full Acceptor Side-Chain Effects on the Excited State Dynamics of Two-Dimensional-Like Conjugated Copolymers in Solution
title_fullStr Acceptor Side-Chain Effects on the Excited State Dynamics of Two-Dimensional-Like Conjugated Copolymers in Solution
title_full_unstemmed Acceptor Side-Chain Effects on the Excited State Dynamics of Two-Dimensional-Like Conjugated Copolymers in Solution
title_short Acceptor Side-Chain Effects on the Excited State Dynamics of Two-Dimensional-Like Conjugated Copolymers in Solution
title_sort acceptor side-chain effects on the excited state dynamics of two-dimensional-like conjugated copolymers in solution
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6151795/
https://www.ncbi.nlm.nih.gov/pubmed/28841145
http://dx.doi.org/10.3390/molecules22091398
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