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2005-11-05 - Article/Dans un journal avec peer-review - Anglais - 14 page(s)

Ziegler A., Mamdouh W., Ver Heyen A., Surin Mathieu , Uji-i H., Abdel-Mottaleb M.M.S., De Schryver F.C., De Feyter S., Lazzaroni Roberto , Höger S., "Covalent Template Approach Toward Functionalized Oligo-Alkyl Substituted Shape-Persistent Macrocycles: Synthesis and Properties of Rings with a Loop" in Chemistry of Materials, 17, 23, 5670-5683

  • Edition : American Chemical Society, Washington (DC)
  • Codes CREF : Physico-chimie générale (DI1320), Chimie macromoléculaire (DI1315), Chimie organique (DI1313)
  • Unités de recherche UMONS : Chimie des matériaux nouveaux (S817)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) The synthesis, properties, and conformation of shape-persistent macrocycles with extraannular oligo-alkyl groups and an intraannular bis(hydroxymethyl)biphenylene diester are investigated. The key step in the preparation is the template-supported Glaser coupling of rigid bisacetylenes which allows obtaining the cyclic product in 81% yield. Contrary to the initial expectations, the compounds do not exhibit liquid crystalline phases. This could be explained by a nonplanar conformation of the molecules because the biphenylene bridge is longer than the diameter of the rings. On the other hand, scanning tunneling microscopy investigations indicate that the intraannular biphenylene bridge can be located in the same plane as the aromatic backbone of the macrocycles on graphite. Modeling involving molecular mechanics and molecular dynamics simulations unraveled this apparent inconsistency by showing that the molecules adopt a nonplanar conformation in the absence of the solid support whereas planarization takes place when they are adsorbed on the graphite surface.

Notes :
  • (Anglais) Publié en ligne le 19 octobre 2005
Identifiants :
  • DOI : 10.1021/cm051386l
  • ISSN : 0897-4756