Structuring of Alkyl-Triazole Bridged Silsesquioxanes

Autor: Luís D. Carlos, Guillaume Toquer, M. Wong Chi Man, Paulo Almeida, M. A. Cardoso, S. C. Nunes, Xavier Cattoën, Paula Ferreira, V. de Zea Bermudez, R. Ferreira, Alvaro Mayoral
Přispěvatelé: Universidade da Beira Interior, Universidade de Trás-os-Montes e Alto Douro (UTAD), Universidade do Trás-os-Montes e Alto Douro, Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Departemento de Fisica and CICECO, Universidade de Aveiro, University of Zaragoza - Universidad de Zaragoza [Zaragoza], Centro de Investigacao em Materiais Ceramicaos e Compositos (CICECO), Optique et Matériaux (OPTIMA ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), University of Beira Interior [Portugal] (UBI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Optique et Matériaux (NEEL - OPTIMA), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2017
Předmět:
Zdroj: Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname
ChemistrySelect
ChemistrySelect, Wiley, 2017, 2 (1), pp.432-442. ⟨10.1002/slct.201601806⟩
ChemistrySelect, 2017, 2 (1), pp.432-442. ⟨10.1002/slct.201601806⟩
ISSN: 2365-6549
DOI: 10.1002/slct.201601806
Popis: Non-porous bridged silsesquioxanes (BSs) were produced by sol-gel reactions and self-directed assembly, in the presence of an acid catalyst and a large excess of water, from bridged organosilane precursors (BOPs) synthesized by click chemistry. The rational design of the compounds, comprising an amine group and alkyl chains with variable length (n), pendant and anchored on a single position to a triazole ring, and the control of acid content (w, moles of acid per moles of BOP) enabled the tuning of the morphology and structure of the BSs. At n=6, 12 and 16, and w=0.2 amorphous hybrids were produced as uniform isotropic micro- to nanospheres. Structuring resulted at n =16 and w=1.2 or n=20 and w=0.2, yielding lamellar bilayer structures. In the case of the BS with n=20 and w=1.2 a lamellar bilayer phase and a minor hexagonal 2D structure emerged. The quite unusual formation of the latter structure was attributed to the presence of a chloride ion close to the proton located between the N(2) atom of the triazole ring and the amine group of the organic spacer, acting as a curvature agent.
Databáze: OpenAIRE
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