title: A zeolitic material with a three-dimensional pore system formed by straight 12- and 10-ring channels synthesized with an imidazolium derivative as structure-directing agent.
abstract: IM-20 is a novel microporous germanosilicate with an interesting zeolitic structure. It has been prepared via the fluoride route with 3-butyl-1-methyl-3H-imidazol-1-ium as the organic structure-directing agent and its structure solved from synchrotron powder X-ray diffraction data. The chemical formula per unit cell is Si(42.2)Ge(17.8)O(120) under its calcined form. IM-20 possesses a new framework topology, the 3D channel system being formed by straight intersecting 12- and 10-membered rings. Two types of d4r composite building units are present in IM-20, their average Si/Ge molar ratio being about 8.52 or 0.56. Surprisingly, the pure silica or silica-rich units are fluoride-free in the as-synthesized material.
authors.affiliation: Equipe Matériaux à Porosité Contrôlée, Institut de Science des Matériaux de Mulhouse, LRC CNRS 7228, Université de Haute Alsace, ENSCMu, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France.
authors.forename: Mathias
authors.initials: M
authors.lastname: Dodin
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Paillaud
authors.forename: Yannnick
authors.initials: Y
authors.lastname: Lorgouilloux
authors.forename: Philippe
authors.initials: P
authors.lastname: Caullet
authors.forename: Erik
authors.initials: E
authors.lastname: Elkaïm
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bats