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Studies on Clathrasils. X. The effect of “help gases” on the formation and stability of clathrasils
Author(s) -
Gunawardane R. P.,
Gies H.,
Liebau F.
Publication year - 1987
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19875460321
Subject(s) - clathrate hydrate , nitrogen , molecule , chemistry , hydrothermal circulation , pyrrolidine , chemical engineering , aqueous solution , organic chemistry , hydrate , engineering
Members of all known clathrasil families have been synthesized from aqueous silica solutions under hydrothermal conditions in the presence of their characteristic guest molecules and in the absence of atmospheric gases. The small cages of the products, otherwise filled with nitrogen, were found to be empty. In addition to clathrasils, silica‐ZSM‐48 was obtained as a reaction product in the absence of atmospheric gases and pyrrolidine as the guest. It appears that small “help gas” molecules such as nitrogen play only a minor role in the stability of clathrasil frameworks unlike in the case of some clathrate hydrates. A comparison of rates of formation of clathrasils synthesized in air and in the absence of “help gases” is also presented.