Acta Crystallographica Section C

Crystal Structure Communications

Volume 59, Part 10 (October 2003)

Acta Cryst. (2003). C59, i100-i102    [doi:10.1107/S0108270103014586]

Cs[Si₃O₆(OH)] and Rb[Si₂O₄(OH)]: two novel phyllosilicates

I. Bull and J. B. Parise

Abstract: The crystal structures of two novel phyllosilicates with compositions Cs[Si₃O₆(OH)] (caesium hydroxohexaoxotetraotrisilicate) and Rb[Si₂O₄(OH)] (rubidium hydroxohexaoxotetraodisilicate) have been characterized by X-ray diffraction. The topology of the caesium phyllosilicate silica sheet consists of interconnected four- and six-membered rings and thus differs from all of the previously reported phyllosilicates. The topology of the rubidium phyllosilicate silica sheet consists of six-membered rings only, in boat conformations, resulting in a corrugated sheet similar to that observed in -Na₂Si₂O₅. Both of the title compounds exhibit the characteristic sandwich structure of sheet silicates, with the Cs atom ninefold coordinated and the Rb atom eightfold coordinated to the framework O atoms.

Formula: Cs[Si₃O₆(OH)] and Rb[Si₂O₄(OH)]

Online 30 September 2003

	Structure factor file (CIF format) (80.6 kbytes) Contains datablock I
	Structure factor file (CIF format) (31.7 kbytes) Contains datablock II

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