Supramolecular Organization of QzQ'-Disubstituted Sexithiophenes (Articolo in rivista)

Type
Label
  • Supramolecular Organization of QzQ'-Disubstituted Sexithiophenes (Articolo in rivista) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Alternative label
  • Schenning P. H. J. 1, Kilbinger A. F. M. 2, Biscarini F. 3, Cavallini M. 4, Cooper H. J. 5, Derrick P. J. 6, Feast W. J. 7, Lazzaroni R. 8, LeclÈ Ph., 9 Re, Mcdonell L. A. 10, Meijer E. W. 11, Meskers S. C. J. 12 (2002)
    Supramolecular Organization of QzQ'-Disubstituted Sexithiophenes
    in Journal of the American Chemical Society (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Schenning P. H. J. 1, Kilbinger A. F. M. 2, Biscarini F. 3, Cavallini M. 4, Cooper H. J. 5, Derrick P. J. 6, Feast W. J. 7, Lazzaroni R. 8, LeclÈ Ph., 9 Re, Mcdonell L. A. 10, Meijer E. W. 11, Meskers S. C. J. 12 (literal)
Pagina inizio
  • 1269 (literal)
Pagina fine
  • 1275 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 124 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1,11,12-Laboratory of Macromolecular and Organic Chemistry, Eindhoven University , The Netherlands. 2,7-IRC in Polymer Science and Technology, University of Durham, Durham U.K. 3,4 - ISMN-CNR,Bologna, Italy. 5,6,10-University of Warwick, Coventry,U.K. 8,9-Laboratory for Chemistry of Novel Materials,University of Mons-Hainaut,Mons, Belgium, (literal)
Titolo
  • Supramolecular Organization of QzQ'-Disubstituted Sexithiophenes (literal)
Abstract
  • The self-assembly of alpha,alpha'-linked sexithiophenes with chiral and achiral penta(ethylene glycol) chains attached at the alpha-positions of the terminal rings, that is, 2,2':5',2'':5'',2''':5''',2'''':5'''',2'''''-sexithiophene-5,5'''''-dicarboxylic acid-2S)-2-methyl-3,6,9,12,15-pentaoxahexadecyl ester (1) and 2,2':5',2'':5'',2''':5'''',2''''':5''''',2'''''-sexithiophene-5,5'''''-dicarboxylic acid-3,6,9,12,15-pentaoxahexadecyl ester (2), respectively is described. Analysis of the UV/vis, fluorescence, circular dichroism, and circular polarization of luminescence spectroscopic data shows that these compounds form chiral aggregates in polar solvents and in the solid state. In n-butanol aggregation occurs at temperatures below 30 degrees C, while above this threshold temperature the aggregates break up without an intermediate disordered state of aggregation, and the compounds are molecularly dissolved. The \"melting temperature\" of the aggregates depends on the concentration of sexithiophene, indicating that the optical changes observed are a result of intermolecular processes. Mass spectrometric measurements reveal that 1 and 2 can form mixed aggregates. Analysis of the optical spectra reveals that in these mixed aggregates, chiral 1 molecules act as \"sergeants\" to direct the packing of the \"soldiers\" 2, illustrating cooperativity within the columns. In water, the same type of chiral aggregates are formed as in n-butanol below 30 degrees C; however, these aggregates are still present, but the chirality is lost above 30 degrees C. In spin-coated films of 1 chiral aggregates are present. AFM studies show that 1 self-organizes into chiral fiberlike structures in the solid state. Furthermore both 1 and 2 display thermotropic liquid crystalline behavior between 180 and 200 degrees C. (literal)
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