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Self-Assembly and Molecular Dynamics of Oligoindenofluorenes

Authors :
Mahdy M. Elmahdy
George Floudas
Luke Oldridge
Klaus Müllen
Andrew C. Grimsdale
Source :
ChemPhysChem. 7:1431-1441
Publication Year :
2006
Publisher :
Wiley, 2006.

Abstract

The optical properties, self assembly mechanism, thermal properties, and the associated molecular dynamics of a series of stable blue-emitting oligoindenofluorenes up to the polymer were investigated by photoluminescence, wide-angle X-ray scattering, polarizing optical microscopy, differential scanning calorimetry, and di-electric spectroscopy. Oligomers of indenofluorenes possess high structural order and form smectic mesophases, as opposed to the nematic mesophases formed in the corresponding oligofluorenes. The a-process associated with the liquid-to-glass transition displays an asymmetric broadening of relaxation times (non- Debye process), with a non-Arrhenius temperature dependance of relaxation times and a strong molecular weight dependance. The low dielectric loss and low ionic conductivity revealed the absence of ketone structural defects, which is consistent with the observed stable blue emission. Chemphyschem

Details

ISSN :
14394235
Volume :
7
Database :
OpenAIRE
Journal :
ChemPhysChem
Accession number :
edsair.doi.dedup.....6ea530d8d7edde21fd066adf13592095
Full Text :
https://doi.org/10.1002/cphc.200600015