title: Stoppering/unstoppering of a rotaxane formed between an N-hetorycle ligand containing surfactant: β-cyclodextrin pseudorotaxane and pentacyanoferrate(II) ions.
abstract: The assembly of a surfactant-based rotaxane by adding the labile aquopentacyanoferrate(II) ion to the previously formed pseudorotaxane between the surfactant 11-(isonicotinoyloxy)-N,N,N-triethyl-1-undecanaminium bromide and β-cyclodextrin was investigated by1H NMR and kinetic measurements. NMR spectroscopy has showed that the rotaxane can be formed through two different mechanisms. The rotaxane can be unstoppered by using the pyridine ligand substitution reaction by the high-field cyanide ligand. In this work a new method is developed for the preparation of several new surfactant-based rotaxanes by changing the hydrophilic and hydrophobic regions of the surfactants and the nature of the macrocycle.
authors.affiliation: Department of Physical Chemistry, University of Seville, C/ Profesor García González 1, 41012 Seville, Spain.
authors.forename: Victoria I
authors.initials: VI
authors.lastname: Martín
authors.affiliation: NMR Service, University of Seville, Apartado 1203, E-41071 Seville, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Angulo
authors.affiliation: Department of Physical Chemistry, University of Seville, C/ Profesor García González 1, 41012 Seville, Spain.
authors.forename: Pilar
authors.initials: P
authors.lastname: López-Cornejo
authors.affiliation: Department of Chemical Engineering, Physical Chemistry and Material Science, Faculty of Experimental Sciences, Campus El Carmen, Avda. de las Fuerzas Armadas s/n, 21071 Huelva, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: López-López
authors.affiliation: Department of Physical Chemistry, University of Seville, C/ Profesor García González 1, 41012 Seville, Spain.
authors.forename: María José
authors.initials: MJ
authors.lastname: Marchena
authors.affiliation: Department of Physical Chemistry, University of Seville, C/ Profesor García González 1, 41012 Seville, Spain. Electronic address: moya@us.es.
authors.forename: María Luisa
authors.initials: ML
authors.lastname: Moyá
keywords: (1)H NMR; Cyclodextrins; Kinetics; Rotaxane; Stoppering; Surfactants; Unstoppering