title: Conformational changes of a calix[8]arene derivative at the air-water interface.
abstract: The particular behavior of a p-tert-butyl calix[8]arene derivative (C8A) has been studied at the air-water interface using surface pressure-area isotherms, surface potential-area isotherms, film relaxation measurements, Brewster angle microscopy (BAM), and infrared spectroscopy for Langmuir-Blodgett films. Thus, it is observed that the properties of the film, for example, isotherms, domain formation, and FTIR spectra, recorded during the first compression cycle differ appreciably from those during the second compression and following cycles. The results obtained are interpreted on the basis of the conformational changes of the C8A molecules by surface pressure, allowing us to inquire into the inter- and intramolecular interactions (hydrogen bonds) of those molecules. Thus, the compression induces changes in the kind of hydrogen bonds from intra- and intermolecular with other C8A molecules to hydrogen bonds with water molecules.
authors.affiliation: Departamento de Química Física y Termodinamica Aplicada, Universidad de Córdoba, Campus Universitario de Rabanales, Ed. Marie Curie, E-14071 Córdoba, Spain.
authors.forename: Gustavo
authors.initials: G
authors.lastname: de Miguel
authors.forename: José M
authors.initials: JM
authors.lastname: Pedrosa
authors.forename: María T
authors.initials: MT
authors.lastname: Martín-Romero
authors.forename: Eulogia
authors.initials: E
authors.lastname: Muñoz
authors.forename: Tim H
authors.initials: TH
authors.lastname: Richardson
authors.forename: Luis
authors.initials: L
authors.lastname: Camacho