title: Langmuir monolayers of an inclusion complex formed by a new calixarene derivative and fullerene.
abstract: The design of new molecules with directed interactions to functional molecules as complementary building blocks is one of the main goals of supramolecular chemistry. A new p-tert-butylcalix[6]arene monosubstituted derivative bearing only one alkyl chain with an acid group (C6A3C) has been synthesized. The C6A3C has been successfully used for building Langmuir monolayers at the air-water interface. The C6A3C molecule adopts a flatlike orientation with respect to the air-water interface. The molecular structure gives the molecule amphiphilic character, while allowing the control of both the dissociation degree and the molecular conformation at the air-water interface. The C63AC has been combined with pristine fullerene (C60) to form the supramolecular complex C6A3C:C60 in 2:1 molar ratio (CFC). The CFC complex retains the ability of C6A3C to form Langmuir monolayers at the air/water interface. The interfacial molecular arrangement of the CFC complex has been convincingly described by in situ UV-vis reflection spectroscopy and synchrotron X-ray reflectivity measurements. Computer simulations complement the experimental data, confirming a perpendicular orientation of the calixarene units of CFC with respect to the air-water interface. This orientation is stabilized by the formation of intermolecular H-bonds. The interfacial monolayer of the CFC supramolecular complex is proposed as a useful model for the well-defined self-assembly of recognition and functional building blocks.
authors.affiliation: Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Córdoba, Spain.
authors.forename: Antonio M
authors.initials: AM
authors.lastname: González-Delgado
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Giner-Casares
authors.forename: Gerald
authors.initials: G
authors.lastname: Brezesinski
authors.forename: Jean-Bernard
authors.initials: JB
authors.lastname: Regnouf-de-Vains
authors.forename: Luis
authors.initials: L
authors.lastname: Camacho
mesh_terms: D000388:Air; D047250:Calixarenes / Q000737:chemistry*; D037741:Fullerenes / Q000737:chemistry*; D008853:Microscopy; D008958:Models, Molecular; D008968:Molecular Conformation; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D037741:Fullerenes; D014867:Water; D047250:Calixarenes