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Proceedings Paper

Optical spectroscopy of single-molecule and aggregate hexabenzocoronene derivatives
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Paper Abstract

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-PhC12 single molecules, at high concentration, implies that HBC-C8,2 aggregates 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.

Paper Details

Date Published: 27 August 2003
PDF: 11 pages
Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); doi: 10.1117/12.463629
Show Author Affiliations
Alexander John Fleming, Trinity College Dublin (Ireland)
Jonathan N. Coleman, Trinity College Dublin (Ireland)
Alan Brian Dalton, Univ. of Texas at Dallas (United States)
Andreas Fechtenkoetter, Max-Planck-Institut fuer Polymerforschung (Germany)
Mark D. Watson, Max-Planck-Institut fuer Polymerforschung (Germany)
Klaus Muellen, Max-Planck-Institut fuer Polymerforschung (Germany)
Hugh James Byrne, Dublin Institute of Technology (Ireland)
Werner J. Blau, Trinity College Dublin (Ireland)

Published in SPIE Proceedings Vol. 4876:
Opto-Ireland 2002: Optics and Photonics Technologies and Applications
Vincent Toal; Norman Douglas McMillan; Gerard M. O'Connor; Eon O'Mongain; Austin F. Duke; John F. Donegan; James A. McLaughlin; Brian D. MacCraith; Werner J. Blau, Editor(s)

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