Synthesis of a 12-membered cyclic siloxane possessing alkoxysilyl groups as a nanobuilding block and its use for preparation of gas permeable membranes

Abstract

A twelve-membered cyclic siloxane possessing alkoxysilyl groups was newly synthesized as a nanobuilding block to form a gas permeable membrane.

Cu6- and Cu8-Cage Sil- and Germsesquioxanes: Synthetic and Structural Features, Oxidative Rearrangements, and Catalytic Activity

“…Another significant chemistry domain of partly condensed polyhedral silsesquioxanes concerns their use as versatile matrixes for cagelike metallacomplexes and clusters. − The corresponding metallasilsesquioxanes are intensely investigated as candidates for the construction of luminescent devices, unusual molecular magnets (including first examples of single molecular magnets and spin-glass behavior), flame-retardant agents, − catalysts, − nanobuilding blocks (for the preparation of gas-permeable membranes and nanoparticles), and small-molecule activators . Recently, a series of actinide (uranium, neptunium, and plutonium) metallasilsesquioxanes were theoretically predicted, showing a prospect for the disposal of radioactive actinides…”

High-Nuclearity (Cu8-Based) Cage Silsesquioxanes: Synthesis and Structural Study

“…Unusual representatives of cage metallacomplexes, namely, cage-like metallasilsesquioxanes − (CLMSs), are a worldwide hot research topic being developed by numerous research teams due to a variety of synthetic approaches − to such compounds, their structural multitude, − intriguing magnetic (spin glass) − properties, and potential applications. Among potential applied fields, catalysis, − production of brush-like polymer materials, − membranes, nanoparticles, coordination polymers ,,− and calcined inorganic materials − could be mentioned. One of widespread geometries of CLMSs is a prism-like architecture with parallel layersone metal oxide (M–O–M) and two siloxane (Si–O–Si) ones (Figure , left).…”

Synthesis of Polycyclic and Cage Siloxanes by Hydrolysis and Intramolecular Condensation of Alkoxysilylated Cyclosiloxanes

“…[1][2][3][4] The physical properties and performance of siloxane-based materials depend substantially on their structures.I nt he design of siloxane-based materials on the molecular scale to the mesoscale, ab uilding-block approachu sing oligosiloxanes with specific structures exhibits potential. [5] Until now,o ligosiloxanes with linear, [6] branched, [7,8] ladder-like, [9,10] cyclic, [11][12][13][14][15][16] or cage structures [17,18] have been used as building blockst op roduce soluble polymers with organic or siloxane linkers, [11,16,19,20] three-dimensionally crosslinked microporous materials, [12,17,[21][22][23][24] ordered mesostructured materials, [6-8, 14, 18, 25, 26] and crystalline zeolitic materials. [27,28] Oligosiloxanes with polycyclic and cage structures are of particular interest because they are the basic structural units of crystalline silica materials, such as layered silicate and zeolites.…”