Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Spreading monolayers and Langmuir–Blodgett films of a novel type of optically active macrocyclic poly(ether sulfone)s containing 1,1′-bi-2-naphthol moiety
Ist Teil von
Thin solid films, 2002-03, Vol.406 (1), p.228-232
Ort / Verlag
Lausanne: Elsevier B.V
Erscheinungsjahr
2002
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
Aimed at investigating the monolayers and Langmuir–Blodgett (LB) films of compounds without any substituted alkyl chains and constructing chiral ultrathin films, a new group of optically active macrocyclic poly(ether sulfone)s containing a binaphthyl group, which have no substituted alkyl chains, were synthesized. The spreading behavior and the ultrathin film fabrication of these compounds was studied. Stable monolayers with collapse surface pressures up to 40 mN m
−1 were formed at the air/water interface and uniform LB films were fabricated by using the horizontal lifting method. The optical activities of the compounds were maintained in the LB films. Transferred LB films were characterized by UV-vis, fluorescence and circular dichroism spectroscopy. It was found that the
1B
b,
1L
a and
1L
b bands of the compounds showed a red shift compared with the corresponding solutions. While no split of the Cotton effect was observed for the dimeric compound, strong exciton couplings that could be ascribed to the interactions between the naphthyl groups were observed for the trimeric macrocyclic compounds.