gamma-Ray radiolysis and theoretical study on radical ions of star-shaped oligofluorenes having a truxene or isotruxene as a core
Journal
Chemical Physics
Journal Volume
419
Pages
118-123
Date Issued
2013
Author(s)
Abstract
Poly- and oligofluorenes have been intensively studied for years, because of their excellent properties as photo- and electro-functional materials. Especially, star-shaped oligofluorenes as two-dimensional oligomers are interesting materials for wide researchers. To understand their electronic properties in charged states, absorption spectra of radical cation and radical anion of star-shaped oligomers with varied size were investigated by means of γ-ray radiolysis. The absorption spectra of their radical ions ranged from the visible to near-IR regions were successfully obtained. By using the theoretical calculation, the observed peaks were assigned. It is indicated that the transition between HOMO and LUMO of the original neutral state plays a significant role in the visible region. Furthermore, it is indicated that the star-shaped oligofluorenes tend to take a planar structure upon oxidation and reduction. © 2013 Elsevier B.V. All rights reserved.
Type
journal article