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Interplay of localized pyrene chromophores and π−conjugation in novel poly(2,7- pyrene) ladder polymers

Title data

Rudnick, Alexander ; Kass, Kim-Julia ; Preis, Eduard ; Scherf, Ullrich ; Bässler, Heinz ; Köhler, Anna:
Interplay of localized pyrene chromophores and π−conjugation in novel poly(2,7- pyrene) ladder polymers.
In: The Journal of Chemical Physics. Vol. 146 (2017) . - No. 174903.
ISSN 0021-9606
DOI: https://doi.org/10.1063/1.4982046

Abstract in another language

We present a detailed spectroscopic study, along with the synthesis, of conjugated, ladder-type 2,7-linked poly(pyrene)s. We observe a delocalization of the first singlet excited state along the polymer backbone, i.e., across the 2,7 linkage in the pyrene moiety, in contrast to earlier studies on conjugated 2,7-linked poly(pyrene)s without ladder structure. The electronic signature of the pyrene unit is, however, manifested in an increased lifetime and reduced oscillator strength as well as a modified vibronic progression in absorption of the singlet state compared to a ladder-type poly(para-phenylene) (MeLPPP). Furthermore, the reduced oscillator strength and increased lifetime slow down Förster-type energy transfer in films, where this transfer occurs to sites with increasing inter-chain coupling of H-type nature.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 09 May 2017 06:55
Last Modified: 09 May 2017 06:55
URI: https://eref.uni-bayreuth.de/id/eprint/37082