Article (Scientific journals)
Covalent Template Approach Toward Functionalized Oligo-Alkyl Substituted Shape-Persistent Macrocycles: Synthesis and Properties of Rings with a Loop
Ziegler, A.; Mamdouh, W.; Ver Heyen, A. et al.
2005In Chemistry of Materials, 17 (23), p. 5670-5683
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Abstract :
[en] 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.
Disciplines :
Chemistry
Author, co-author :
Ziegler, A.
Mamdouh, W.
Ver Heyen, A.
Surin, Mathieu  ;  Université de Mons > Faculté des Sciences > Chimie des matériaux nouveaux
Uji-i, H.
Abdel-Mottaleb, M.M.S.
De Schryver, F.C.
De Feyter, S.
Lazzaroni, Roberto ;  Université de Mons > Faculté des Sciences > FS - Service du Doyen
Höger, S.
Language :
English
Title :
Covalent Template Approach Toward Functionalized Oligo-Alkyl Substituted Shape-Persistent Macrocycles: Synthesis and Properties of Rings with a Loop
Publication date :
05 November 2005
Journal title :
Chemistry of Materials
ISSN :
0897-4756
eISSN :
1520-5002
Publisher :
American Chemical Society, United States - District of Columbia
Volume :
17
Issue :
23
Pages :
5670-5683
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
S817 - Chimie des matériaux nouveaux
Research institute :
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
Commentary :
Publié en ligne le 19 octobre 2005
Available on ORBi UMONS :
since 10 June 2010

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