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Tytuł:
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Generating long supramolecular pathways with a continuous density of states by physically linking conjugated molecules via their end groups.
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Autorzy:
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Shokri R; Institut de Sciences des Matériaux de Mulhouse IS2M, LRC 7228-CNRS-UHA, 4 rue des frères Lumière, 68093 Mulhouse, France.
Lacour MA
Jarrosson T
Lère-Porte JP
Serein-Spirau F
Miqueu K
Sotiropoulos JM
Vonau F
Aubel D
Cranney M
Reiter G
Simon L
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Źródło:
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Journal of the American Chemical Society [J Am Chem Soc] 2013 Apr 17; Vol. 135 (15), pp. 5693-8. Date of Electronic Publication: 2013 Apr 09.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Publication: Washington, DC : American Chemical Society
Original Publication: Easton, Pa. [etc.]
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Entry Date(s):
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Date Created: 20130323 Date Completed: 20131021 Latest Revision: 20130417
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Update Code:
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20240104
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DOI:
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10.1021/ja311964b
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PMID:
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23517379
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Self-assembly of conjugated 2,5-dialkoxy-phenylene-thienylene-based oligomers on epitaxial monolayer graphene was studied in ultrahigh vacuum by low-temperature scanning tunneling microscopy (STM). The formation of long one-dimensional (1D) supramolecular chain-like structures has been observed, associated to a physical linking of their ends which involved the rotation of the end thiophene rings in order to allow π-π stacking of these end-groups. dI/dV maps taken at an energy corresponding to the excited states showed a continuous electronic density of states, which tentatively suggests that within such molecular chains conjugation of electrons is preserved even across physically linked molecules. Thus, in a self-organization process conjugation may be extended by appropriately adapting conformations of neighboring molecules. Our STM results on such self-organized end-linked molecules potentially represent a direct visualization of J-aggregates.