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Synthesis and characterization of the new cyclosilicate hydrate (hexamethyleneimine)(4)center dot[Si8O16(OH)(4)]center dot 12H(2)O

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A new cyclosilicate hydrate with composition (C6H14N)(4)center dot[Si8O16(OH)(4)]center dot 12H(2)O was crystallized and the structure determined by single-crystal X-ray diffraction. The structure, described by the tetragonal space group I4(1)/a, with unit cell dimensions of a = 39.2150(2) angstrom and c = 14.1553(2) angstrom, contains columns of hydrogen-bonded cubic octamer silicate anions. The space between silicate columns holds hydrogen-bonded water and protonated hexamethyleneimine molecules compensating the negative charge of the silicate. The crystal water can be removed resulting in a rearrangement of the columns into ortho-rhombic symmetry. Removal of the organic moiety causes amorphisation. Flash evacuation results in a new microporous material with pore volumes typical of a zeolite. (C) 2009 Elsevier Inc. All rights reserved.
Tijdschrift: Microporous and Mesoporous Materials
ISSN: 1387-1811
Issue: 1
Volume: 130
Pagina's: 14 - 20
Jaar van publicatie:2010
BOF-keylabel:ja
IOF-keylabel:ja
BOF-publication weight:3
CSS-citation score:1
Authors from:Higher Education