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2001
silicon, Si
I 0058
16 - 019
silicon, Si
New Alkali Cyclosilicates: Cs5 AgSi3 O9 and Cs6 Na6 Si6 O18 .
— The
new cyclosilicates of title are obtained from the reaction of the corresponding
alkyli metal or silver oxides with quartz (450–500 ◦ C, argon, Ag-crucible,
30–40 d). Cs5 AgSi3 O9 crystallizes in the monoclinic space group P21 /m with
Z = 2 and Cs6 Na6 Si6 O18 is trigonal, space group R3m (Z = 3). Characteristic
structural features are isolated [Si3 O9 ]6− and [Si6 O18 ]12− rings, respectively.
In Cs5 AgSi3 O9 the rings are connected to chains via the Ag+ ions. In
Cs6 Na6 Si6 O18 the hexameric rings are separated by layers of NaO4 tetrahedra.
— (MOELLER, ANGELA; AMANN, PETER; Z. Anorg. Allg. Chem. 627
(2001) 2, 172-179; Inst. Anorg. Chem., Univ. Koeln, D-50939 Koeln, Germany;
DE)
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