Observation of the  β ‐Phase in Two Short‐Chain Oligofluorenes | Zendy

Tsoi Wing C. | Zendy; Charas Ana | Zendy; Cadby Ashley J. | Zendy; Khalil Gamal | Zendy; Adawi Ali M. | Zendy; Iraqi Ahmed | Zendy; Hunt Barry | Zendy; Morgado Jorge | Zendy; Lidzey David G. | Zendy

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Observation of the β ‐Phase in Two Short‐Chain Oligofluorenes

Author(s) -

Tsoi Wing C.,

Charas Ana,

Cadby Ashley J.,

Khalil Gamal,

Adawi Ali M.,

Iraqi Ahmed,

Hunt Barry,

Morgado Jorge,

Lidzey David G.

Publication year - 2008

Publication title -

advanced functional materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 6.069

H-Index - 322

eISSN - 1616-3028

pISSN - 1616-301X

DOI - 10.1002/adfm.200700530

Subject(s) - pentamer , oligomer , materials science , monomer , fluorene , planarity testing , phase (matter) , chain (unit) , polymer , chemical physics , polymer chemistry , crystallography , organic chemistry , physics , composite material , chemistry , nuclear magnetic resonance , astronomy

The polymer poly(9,9‐dioctylfluorene) (PF8) can be driven into a morphological form termed the β ‐phase that has enhanced planarity and increased structural rigidity. We show that the β ‐phase can be generated in two different fluorene oligomers; a fluorene pentamer, and a short (statistical) oligomer composed of chains having a maximum length of 19 monomer units. By comparing the energy of the zero‐zero phonon line in fluorescence from the β ‐phase oligomers with that in the PF8 polymer, we show that the electronic conjugation length of the β ‐phase is (30 ± 12) monomer‐units, a value consistent with the persistence length of the molecular chain.

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