Hexakis(2,4,6-triisopropylphenylsilsesquioxane)

Formation and hydrogen bonding of a novel POSS-trisilanol

“…The variation of the Si-O bond lengths covers a narrow range between 1.623-1.642 A ˚which is smaller than in the other structure reports where variations as much as 0.04 to 0.28 A ˚are reported. [32][33][34]36,38 On the other hand, for the Si-O-Si angles values of 129.7-141.1 • are found for 4, which is just average compared with the other structures mentioned before. The unit cell contains four equivalent isolated molecules of 4.…”

Functionalised polyhedral oligomeric silsesquioxane with encapsulated fluoride – first observation of fluxional Si⋯F interactions in POSS

“…11. Given the doublet described above in the 29 Si NMR spectrum, a coalescence of the two signals might be anticipated at sufficiently high temperatures, due to an increased rate of exchange between the various conformers in the system 35,36 . In addition, it might be expected that decreasing temperature would lead to the entrapped fluoride interacting with a single silicon atom at sufficiently low temperature, leading to the emergence of two sets of 29 Si signals; one arising from the silicon species no longer interacting with fluoride, and a second arising from the silicon interacting with fluoride (exhibiting an increased JSi-F).…”

Preparation and Molecular Structure of a Cyclopentyl-Substituted Cage Hexasilsesquioxane T6 (T = cyclopentyl-SiO1.5) Starting from the Corresponding Silanetriol

“…The variation of the Si-O bond lengths covers a narrow range between 1.627 Å and 1.643 Å which is smaller than in the other structure reports where variations as much as 0.04 to 0.28 Å are reported. Until now, only a few structure determinations of hexa(alkyl/aryl)silsesquioxanes with this Si6O9 cage can be found in the literature including tert-butyl [16], cyclohexyl [23], 1,1,2-trimethylpropyl [24], 2,4,6-triisopropylphenyl [25], trimethoxysilyl [26], and isopropyl [27] substituted hexasilsesquioxanes. For these, the mean value of the Si-O-Si angles in the six-membered rings is 130.2(4)°, the mean value of the other Si-O-Si angles is 140.0(8)° (min.…”