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The missing link in the series clathrate hydrates, group silicate hydrates—layer silicate hydrates—porous framework silicas is provided by RUB-15, a new layer silicate hydrate with a three-dimensional bonding network composed of layerlike silicate ions and water molecules linked by hydrogen bonds. A section of the structure of is shown on the right. RUB-15 further illustrates the close relationship between crystalline compounds of water, silica, and mixtures thereof.
Oberhagemann et al. (Sun,) studied this question.