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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents



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ID: 56321.0, MPI für Polymerforschung / MPI Polymerforschung
Ordered architectures of a soluble hexa-peri-hexabenzocoronene-pyrene dyad: Thermotropic bulk properties and nanoscale phase segregation at surfaces
Authors:Tchebotareva, N.; Yin, X. M.; Watson, Mark D.; Samori, P.; Rabe, J. P.; Müllen, Klaus
Language:English
Date of Publication (YYYY-MM-DD):2003-08-13
Title of Journal:Journal of the American Chemical Society
Journal Abbrev.:J. Am. Chem. Soc.
Volume:125
Issue / Number:32
Start Page:9734
End Page:9739
Review Status:not specified
Audience:Not Specified
Abstract / Description:An alkylated hexa-peri-hexabenzocoronene with a covalently tethered pyrene unit serves as a model to study self-assembling discotic pi-system dyads both in the bulk and at a surface. Wide-angle X-ray scattering, polarized light microscopy, and differential scanning calorimetry revealed bulk self-assembly into columnar structures. Relative to a control without a tethered pyrene, the new dyad exhibits a more ordered columnar phase at room temperature but with dramatically lowered isotropization temperature, facilitating homeotropic alignment. These two features are important for processing such materials into molecular electronic devices, e.g., photovoltaic diodes. Scanning tunneling microscopy at a solution-solid interface revealed uniform nanoscale segregation of the large from the small pi-systems, leading to a well-defined two-dimensional crystalline monolayer, the likes of which may be employed in the future to study intramolecular electron transfer processes at surfaces, on the molecular scale.
Comment of the Author/Creator:Date: 2003, AUG 13
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Humboldt Univ, Dept Phys, D-10099 Berlin, Germany.
Identifiers:ISI:000184654700048 [ID No:1]
ISSN:0002-7863 [ID No:2]
LOCALID:P-03-145
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