Optical spectroscopy of single-molecule and aggregate hexabenzocoronene derivatives

Alexander John Fleming; Jonathan N. Coleman; Alan Brian Dalton; Andreas Fechtenkoetter; Mark D. Watson; Klaus Muellen; Hugh James Byrne; Werner J. Blau

doi:10.1117/12.463629

27 August 2003 Optical spectroscopy of single-molecule and aggregate hexabenzocoronene derivatives

Alexander John Fleming, Jonathan N. Coleman, Alan Brian Dalton, Andreas Fechtenkoetter, Mark D. Watson, Klaus Muellen, Hugh James Byrne, Werner J. Blau

Author Affiliations +

Proceedings Volume 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications; (2003) https://doi.org/10.1117/12.463629
Event: OPTO Ireland, 2002, Galway, Ireland

Abstract

The low, medium and high concentration luminescence and luminescence-excitation spectra for alkyl substituted hexa-peri-hexabenzocoronene (HBC-C_8,2) 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-C_8,2 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.

Citation Download Citation

Alexander John Fleming, Jonathan N. Coleman, Alan Brian Dalton, Andreas Fechtenkoetter, Mark D. Watson, Klaus Muellen, Hugh James Byrne, and Werner J. Blau "Optical spectroscopy of single-molecule and aggregate hexabenzocoronene derivatives", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); https://doi.org/10.1117/12.463629

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