Optical spectroscopy of single molecule and aggregate hexabenzocoronene derivatives

A. J. Fleming, J. N. Coleman, A. B. Dalton, A. Fechtenkötter, M. D. Watson, K. Müllen, H. J. Byrne, W. J. Blau

Research output: Contribution to journalConference articlepeer-review


The low, medium and high concentration luminescence and luminescence-excitation spectra for alkyl substituted hexa-peri-hexabenzocoronene (HBC-C8,2) and hexa(4-n-dodecylphenyl) substituted hexa-peri-hexabenzocoronene (HBC-PhC12) are presented. A study of the concentration dependence of the optical properties of these self-assembling molecular nanowires, in the low to medium concentration regime, associates the spectrum at ∼ 10-13 M with the single molecule, and indicates that previously published spectra of HBC's by others were the product of aggregation phenomena. The insertion of an exo-phenyl group between the HBC core and the alkyl side chains, as in HBC-PhC12 was found not to extend the conjugation, but did increase the inhomogeneous broadening of the single molecule luminescence. The continued presence of HBC-PhC 12 single molecules, at high concentration, implies that HBC-C8,2aggregates are thermodynamically more stable than HBC-PhC12 aggregates. In conclusion, the spectroscopic properties of both derivatives were found to be very sensitive to aggregation at low concentration and strongly correlated to the observed macroscopic physical properties.

Original languageEnglish
Pages (from-to)685-695
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue number2
StatePublished - 2002
EventOpto-Ireland 2002: Optics and Photonics Technologies and Applications - Galway, Ireland
Duration: Sep 5 2002Sep 6 2002


  • Aggregation
  • Columnar aggregates
  • Coronene
  • H-aggregates
  • HBC
  • Hexabenzocoronene
  • Nanowires
  • Optical spectroscopy
  • Self-assembling
  • Single molecule

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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