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Ion‐Conduction Pathways in Self‐Organised Ureidoarene–Heteropolysiloxane Hybrid Membranes
Author(s) -
Michau Mathieu,
Barboiu Mihail,
Caraballo Rémi,
ArnalHérault Carole,
Perriat Pascal,
van der Lee Arie,
Pasc A.
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700943
Subject(s) - hybrid material , lamellar structure , membrane , supramolecular chemistry , materials science , nanoscopic scale , siloxane , ion , nanotechnology , self assembly , chemical engineering , polymer , crystal structure , chemistry , crystallography , organic chemistry , composite material , biochemistry , engineering
This paper reports on hybrid organic–inorganic dense membrane materials in which protons and ions are envisioned to diffuse along the hydrophilic pathways. The hierarchical generation of functional hybrid materials was realised in two steps. First, the self‐assembling properties of 3‐(ureidoarene)propyltriethoxysilane compounds 1 – 5 in aprotic solvents were determined, revealing the formation of supramolecular oligomers. Compounds 1 – 5 generate organogels in chloroform or in acetone, leading in a second sol–gel transcription step to hybrid membrane materials on a nanoscopic scale. The crystal structures of 1 – 5 indicate that the arrangement is mainly defined by periodic parallel sheets, resulting from the alignment of hydrophobic organic and inorganic silica layers. Hybrid materials MB 1 – MB 4 , with a similar lamellar structure, define particularly attractive functional transport devices; they are oriented along the organic layers and sandwiched between the two siloxane layers. These systems have been employed successfully to design solid dense membranes and illustrate how the self‐organised hybrid materials perform interesting and potentially useful functions.