title: Langmuir and Langmuir-Blodgett Films from Amphiphilic Pillar[5]arene-Containing [2]Rotaxanes.
abstract: Amphiphilic pillar[5]arene-containing [2]rotaxanes have been prepared and fully characterized. In the particular case of the [2]rotaxane incorporating a 1,4-diethoxypillar[5]arene subunit, the structure of the compound was confirmed by X-ray crystal structure analysis. Owing to a good hydrophilic/hydrophobic balance, stable Langmuir films have been obtained for these rotaxanes and the size of the peripheral alkyl chains on the pillar[5]arene subunit has a dramatic influence on the reversibility during compression-decompression cycles. Indeed, when these are small enough, molecular reorganization of the rotaxane by gliding motions are capable of preventing strong π-π interactions between neighboring macrocycles in the thin film.
authors: Laboratoire de Chimie des Matériaux Moléculaires, Université de Strasbourg et CNRS (UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux (ECPM), 25 rue Becquerel, 67087 Strasbourg Cedex 2 (France).
authors: Thi Minh Nguyet
authors: TM
authors: Trinh
authors: Laboratoire de Chimie des Matériaux Moléculaires, Université de Strasbourg et CNRS (UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux (ECPM), 25 rue Becquerel, 67087 Strasbourg Cedex 2 (France).
authors: Iwona
authors: I
authors: Nierengarten
authors: Laboratoire de Chimie des Matériaux Moléculaires, Université de Strasbourg et CNRS (UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux (ECPM), 25 rue Becquerel, 67087 Strasbourg Cedex 2 (France).
authors: Michel
authors: M
authors: Holler
authors: Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg et CNRS (UMR 7504), 23 rue du Loess, BP 43, 67034 Strasbourg Cedex 2 (France). gallani@unistra.fr.
authors: Jean-Louis
authors: JL
authors: Gallani
authors: Laboratoire de Chimie des Matériaux Moléculaires, Université de Strasbourg et CNRS (UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux (ECPM), 25 rue Becquerel, 67087 Strasbourg Cedex 2 (France). nierengarten@unistra.fr.
authors: Jean-François
authors: JF
authors: Nierengarten
keywords: Langmuir films; amphiphilic compounds; pillar[n]arenes; rotaxanes; supramolecular chemistry