The crystal structure of vinylsilasesquioxane [C2H3SiO1.5]8

Studies of octameric vinylsilasesquioxane by carbon-13 and silicon-29 cross polarization magic angle spinning and inversion recovery cross polarization nuclear magnetic resonance spectroscopy

“…(RSiO 1.5 ) 8 , R = Me, Et, Pr n and Pr i ]. This has been also observed by Baidina et al 10 in the case of the octavinyl derivative (trigonal, space group R3 ¯, a = 13.584, c = 14.364 Å, final R = 0.11). However, several differences between the molecular structure of the octavinyl derivative described in ref.…”

“…This could be especially valuable for NMR studies of amorphous or poorly crystallized materials, which are extensively investigated by 13 C/ 29 Si/ 1 H solid-state NMR techniques. 31,32 In the case of compound 1 one unique crystalline phase is obtained, in contrast with the synthesis proposed by Baidina et al 10 [i.e. direct hydrolysis of Si(C 2 H 3 )Cl 3 ] leading to octa-and deca-silasesquioxanes (C 2 H 3 SiO 1.…”

“…4, [23][24][25] Vinyl derivatives and heterofunctional compounds have been widely investigated by Martynova and co-workers 26,27 including X-ray diffraction studies. 10 In this paper we present a complete study of the 'cubane shaped' octavinyloctasilasesquioxane (C 2 H 3 SiO 1.5 ) 8 1 by X-ray diffraction, infrared and 29 Si/ 31 C solidstate CP MAS NMR spectroscopy; 29 Si CP MAS NMR spectroscopy was used to extract isotropic chemical shifts as well as chemical shift anisotropies (CSAs). Few CSA values related to small organosilicon molecules are available in the literature.…”

Synthesis and structure of functional spherosilicate building block molecules for materials synthesis

“…Three of the four molecules are Lewis base adducts with tin and the fourth water is hydrogen bonded to an exocage oxygen belonging to the silicate molecule. The two pentagonal faces making up the spherosilicate cage are not symmetrical due to ''puckering'' of corresponding Si-O-Si edges of the two opposite faces, similar to what is observed in other Si 10 O 15 containing structures [2,51,59].…”

The polyoctahedral silsesquioxane (POSS) 1,3,5,7,9,11,13,15-octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane (octaphenyl-POSS)

“…Single-crystal structures of several fully condensed symmetric T 8 cages (R 8 Si 8 O 12 ), with eight Si atoms arranged at the corners of a cube, 12 O atoms bridging the edges of the Si 8 cube forming an interstitial cuboctahedron, and eight R groups at the corners of the tetrahedral Si atoms, have been obtained. These include octa(methylsilsesquioxane) (R = CH 3 ; Larsson, 1960a), octasilsesquioxane (R = H; Larsson, 1960c), octa(vinylsilsesquioxane) (R = C 2 H 3 ; Baidina et al, 1979), octa(methoxysilsesquioxane) (R = OCH 3 ; Day et al, 1985), octa(allylsilsesquioxanes) [R = OSi(CH 3 ) 3 ; Podberezskaya et al, 1981], and octa(tolylsilsesquioxane) (R = tolyl; Zakharov et al, 2010). In the case of the octaphenylsilsesquioxane (C 6 H 5 SiO 1.5 ) 8 (C 6 H 5 ), there are older structure reports, with solvates of pyridine (Larsson, 1960b) and o-dichlorobenzene (Shklover et al, 1978), acetone (Hossain et al, 1979), and water (Liu et al, 2004) (Bassindale et al, 2003).…”