Synthesis and properties of monodisperse oligofluorene-functionalized truxenes : highly fluorescent star-shaped architectures

A.L. Kanibolotsky, R. Berridge, P.J. Skabara, I.F. Perepichka, D.D.C. Bradley, M. Koeberg

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Abstract

This paper describes the strategy toward novel monodisperse, well-defined, star-shaped oligofluorenes with a central truxene core and from monofluorene to quaterfluorene arms. Introduction of solubilizing n-hexyl groups at both fluorene and truxene moieties results in highly soluble, intrinsically two-dimensional nanosized macromolecules T1-T4. The radius for the largest oligomer of ca. 3.9 nm represents one of the largest known star-shaped conjugated systems. Cyclic voltammetry experiments reveal reversible or quasi-reversible oxidation and reduction processes (E-ox = +0.74 to 0.80 V, E-red = -2.66 to 2.80 eV vs Fc/Fc(+)), demonstrating excellent electrochemical stability toward both p- and n-doping, while the band gaps of the oligomers are quite high (E-g(CV) = 3.20-3.40 eV). Close band gaps of 3.05-3.29 eV have been estimated from the electron absorption spectra. These star-shaped macromolecules demonstrate good thermal stability (up to 400-420 degreesC) and improved glass transition temperatures with an increase in length of the oligofluorene arms (from T-g = 63 degreesC for T1 to 116 degreesC for T4) and show very efficient blue photoluminescence (lambda(PL) = 398-422 nm) in both solution (Phi(PL) = 70-86%) and solid state (PhiPL = 43-60%). Spectroelectrochernical experiments reveal that compounds T1-T4 are stable electrochromic systems which change their color reversibly from colorless in the neutral state (similar to340-400 nm) to colored (from red to purple color; similar to500-600 nm) in the oxidized state.
Original languageEnglish
Pages (from-to)13695-13702
Number of pages7
JournalJournal of the American Chemical Society
Volume126
Issue number42
DOIs
Publication statusPublished - 2004

Keywords

  • light-emitting-diodes
  • discotic liquid-crystals
  • field-effect transistors
  • phenylboronic acid
  • deuterium nmr
  • blue emission
  • derivatives
  • phase
  • copolymers
  • alignment

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    Kanibolotsky, A. L., Berridge, R., Skabara, P. J., Perepichka, I. F., Bradley, D. D. C., & Koeberg, M. (2004). Synthesis and properties of monodisperse oligofluorene-functionalized truxenes : highly fluorescent star-shaped architectures. Journal of the American Chemical Society, 126(42), 13695-13702. https://doi.org/10.1021/ja039228n