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The new hydrous layer silicate, RUB-55, was synthesized at 160 °C by hydrothermal synthesis from a reaction mixture of SiO 2 /tetramethylammonium hydroxide/H 2 O. The idealized chemical composition of as-made RUB-55 is [(CH 3 ) 4 N] 2 [Si 10 O 18 (OH) 6 ] · 16H 2 O. The XRD powder pattern was indexed in tetragonal symmetry with lattice parameters of  a  0  = 8.8 Å and  c  0  = 14.6 Å. Physico-chemical characterization using solid-state NMR spectroscopy, SEM, TG-DTA, and DRIFT spectroscopy confirmed that RUB-55 is a hydrous layer silicate (HLS). The crystal structure was solved from model building. Rietveld structure refinement of the average structure in space group  P -42 1  m  converged to residual values of  R  Bragg  = 0.029 and  R F   = 0.032 confirming the structure model. The structure of RUB-55 contains silicate layers with a topology that resembles the (001)-section of the sodalite framework as well as a (001)-section of the octadecasil framework. The layer can be regarded as made up by interconnected open, cup-like cavities. These “half-cages” are occupied by tetramethylammonium (TMA) ions which were used as a structure directing agent (SDA) during synthesis. A sheet of hydrogen bonded water molecules is intercalated between the silicate layers. The structure analysis also clearly revealed the presence of very strong hydrogen bonds between the terminal O atoms (silanol/siloxy groups) confirmed by  1 H MAS NMR and DRIFT spectroscopy. RUB-55 is structurally and chemically related to the layer silicates RUB-15, HUS-1 and  β -helix-layered-silicate.

RUB-55, a new hydrous layer silicate with silicate layers known as motives of the sodalite and octadecasil frameworks: Synthesis and crystal structure