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Michel P. de Jong, Wojciech Osikowicz, Stacey L. Sorensen, Sergey Sergeyev, Yves H. Geerts and William R. Salaneck
Femtosecond Charge Transfer in Assemblies of Discotic Liquid Crystals
J. Phys. Chem. C 112 (40), 15784–15790

Abstract
The electronic coupling strength within columns of discotic liquid crystals is investigated using core-level resonant photoemission spectroscopy. Coexisting well-ordered and disordered regions are identified in thin films of tetra-alkoxy-substituted phthalocyanines with the aid of near edge X-ray absorption fine structure and photoelectron spectroscopies. These different regions are used to derive a lower limit for the intermolecular charge transfer bandwidth within the framework of the core-hole clock principle. We find average charge transfer times on the order of a few femtoseconds, that is, significantly faster than the C(1s) core-hole lifetime, which indicates a surprisingly strong electronic coupling between the phthalocyanine units as compared to what is expected from the charge transport characteristics of this material.

Link to the complete paper (if available):
http://pubs.acs.org/doi/abs/10.1021/jp8037494


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