title: An INS study of entrapped organic cations within the micropores of zeolite RTH.
abstract: Two different organic cations (structure directing agents, SDAs) have been selected because of their ability to drive the synthesis of zeolites towards the same microporous material, RUB-13 (RTH), both being organophosphorous compounds. These P containing structure directing agents are characterized by a high concentration of positive charge on the phosphorus atom. Then, in the presence of fluoride anions used in these syntheses, a strong P(+)F(-) electrostatic contribution competes with the van der Waals short range SDAzeolite interaction that drives the zeolite formation. The rotation of the methyl groups present in the SDA is expected to be nearly free if van der Waals interactions dominate, but they will be hindered if the Coulombic P(+)F(-) term forces a closer approach to the SDA towards the zeolite framework. SDAs can be designed a priori to tune which interactions dominate. The rotational mobility of the SDAs, as well as certain related bending modes, has been well tackled by inelastic neutron scattering (INS) in order to test this hypothesis. The INS results provide valuable information for the design of specific SDAs for the synthesis of zeolites.
authors.affiliation: Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France.
authors.forename: Tetiana
authors.initials: T
authors.lastname: Lemishko
authors.affiliation: Instituto de Tecnología Química (UPV-CSIC), Universidad Politécnica de Valencia. Av. de los Naranjos s/n, 46022 Valencia, Spain. gsastre@itq.upv.es jimenez@ill.fr.
authors.forename: Jorge
authors.initials: J
authors.lastname: Simancas
authors.affiliation: Instituto de Tecnología Química (UPV-CSIC), Universidad Politécnica de Valencia. Av. de los Naranjos s/n, 46022 Valencia, Spain. gsastre@itq.upv.es jimenez@ill.fr.
authors.forename: Manuel
authors.initials: M
authors.lastname: Hernández-Rodríguez
authors.affiliation: Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France.
authors.forename: Mónica
authors.initials: M
authors.lastname: Jiménez-Ruiz
authors.affiliation: Instituto de Tecnología Química (UPV-CSIC), Universidad Politécnica de Valencia. Av. de los Naranjos s/n, 46022 Valencia, Spain. gsastre@itq.upv.es jimenez@ill.fr.
authors.forename: German
authors.initials: G
authors.lastname: Sastre
authors.affiliation: Instituto de Tecnología Química (UPV-CSIC), Universidad Politécnica de Valencia. Av. de los Naranjos s/n, 46022 Valencia, Spain. gsastre@itq.upv.es jimenez@ill.fr.
authors.forename: Fernando
authors.initials: F
authors.lastname: Rey