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Synthese und Kristallstruktur von Tetramethylammonium‐Sodalith
Author(s) -
Baerlocher Ch.,
Meier W. M.
Publication year - 1969
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19690520712
Subject(s) - tetramethylammonium , chemistry , sodalite , aluminosilicate , crystallography , inorganic chemistry , methyl group , hydrogen bond , zeolite , yield (engineering) , crystal structure , oxygen , group (periodic table) , oxygen atom , ion , organic chemistry , molecule , catalysis , thermodynamics , physics
Tetramethylammonium sodalite, a synthetic species of composition (CH 3 ) 4 NAlSi 5 O 12 , has been obtained in good yield under hydrothermal conditions in the absence of metal cations. Its crystal structure has been determined using accurate powder data since single crystals could not be grown. The structure seems to be body‐centered cubic with a = 8.975 Å but the true symmetry is non‐cubic (probable space group I 4 ). Each cage of the aluminosilicate framework contains one tetramethylammonium ion. The organic cation does not conform to the cubic symmetry of the ideal framework. The methyl groups point to oxygen atoms of the framework, and the short methyl‐oxygen distances of 3.06 Å indicate strong CH … O interaction. The present results indicate beyond doubt that CH … O hydrogen bonding involving methyl groups can occur in silicates. This is of particular significance in zeolite chemistry and in the interpretation of interlayer distances in organic clay complexes.