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231223s2006 xx ||||| 00| ||eng c |
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|a DE-627
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|a eng
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|a Abdel-Mottaleb, Mohamed M S
|e verfasserin
|4 aut
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|a Influence of halogen substituents on the self-assembly of oligothiophenes--a combined STM and theoretical approach
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|c 2006
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 09.05.2007
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|a Date Revised 07.02.2006
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Iodinated quaterthiophenes 2-3 have been synthesized and their self-assembling behavior investigated at the liquid-solid interface by means of high-resolution scanning tunneling microscopy in comparison to parent oligothiophene 1. All three compounds spontaneously give well-ordered 2D crystalline monolayers at the graphite surface and order in a lamella-type arrangement of the conjugated backbones concomitant with an interlocking of the alkyl side chains. Symmetrically substituted oligothiophenes 1 and 3 without a relevant dipole moment self-assemble in a similar fashion, exhibiting comparable unit cells, whereas monoiodo derivative 2 arranges as pairs along the lamella axis due to the presence of a permanent dipole moment induced by the polarizable halogen group. Corroborated by quantum chemical calculations, novel head-to-head (iodo-iodo) intermolecular interactions were found to take place for this unsymmetrical derivative. The investigation of mixed solutions clearly reveals that at the solid-liquid interface a homogeneous layer of this compound is formed, which comprises the highest packing density leading to a separation process at the interface
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|a Journal Article
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|a Götz, Günther
|e verfasserin
|4 aut
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|a Kilickiran, Pinar
|e verfasserin
|4 aut
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|a Bäuerle, Peter
|e verfasserin
|4 aut
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|a Mena-Osteritz, Elena
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 22(2006), 4 vom: 14. Feb., Seite 1443-8
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|x 1520-5827
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|g volume:22
|g year:2006
|g number:4
|g day:14
|g month:02
|g pages:1443-8
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