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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MDPI
2017
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| Online Access: | https://eprints.nottingham.ac.uk/49572/ |
| _version_ | 1848798027418959872 |
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| author | Huo, Ming-Ming Hu, Rong Yan, Wei Wang, Yi-Tong Chee, Kuan Wang, Yong Zhang, Jian-Ping |
| author_facet | Huo, Ming-Ming Hu, Rong Yan, Wei Wang, Yi-Tong Chee, Kuan Wang, Yong Zhang, Jian-Ping |
| author_sort | Huo, Ming-Ming |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| 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). |
| first_indexed | 2025-11-14T20:13:14Z |
| format | Article |
| id | nottingham-49572 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:13:14Z |
| publishDate | 2017 |
| publisher | MDPI |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-495722020-05-04T19:02:25Z https://eprints.nottingham.ac.uk/49572/ 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 Wang, Yong Zhang, Jian-Ping 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 Article PeerReviewed Huo, Ming-Ming, Hu, Rong, Yan, Wei, Wang, Yi-Tong, Chee, Kuan, Wang, Yong and Zhang, Jian-Ping (2017) Acceptor side-chain effects on the excited state dynamics of two-dimensional-like conjugated copolymers in solution. Molecules, 22 (9). 1398/1-1398/14. ISSN 1420-3049 two-dimensional like conjugated copolymers; acceptor side-chain; transient absorption spectrum; intramolecular charge-transfer characters; excited state dynamics http://www.mdpi.com/1420-3049/22/9/1398 doi:10.3390/molecules22091398 doi:10.3390/molecules22091398 |
| spellingShingle | two-dimensional like conjugated copolymers; acceptor side-chain; transient absorption spectrum; intramolecular charge-transfer characters; excited state dynamics Huo, Ming-Ming Hu, Rong Yan, Wei Wang, Yi-Tong Chee, Kuan 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 | two-dimensional like conjugated copolymers; acceptor side-chain; transient absorption spectrum; intramolecular charge-transfer characters; excited state dynamics |
| url | https://eprints.nottingham.ac.uk/49572/ https://eprints.nottingham.ac.uk/49572/ https://eprints.nottingham.ac.uk/49572/ |