(Pentamethylcyclopentadienyl)silanetriol:  Synthesis, Derivatization, and X-ray Crystal Structure of Its Hemihydrate

Abstract

Hydrolysis of Cp*SiCl 3 affords the silanetriol Cp*Si(OH) 3 (1) as an amorphous solid. Reaction of 1 with Me 3 SiCl/NEt 3 and with N(SnMe 3 ) 3 leads to Cp*Si-(OSiMe 3 ) 3 ( 2) and Cp*Si(OSnMe 3 ) 3 (3), respectively. From a concentrated solution of 1 in diethyl ether, the hemihydrate Cp*Si(OH) 3 ‚0.5 H 2 O ( 4) is obtained as colorless crystals. An X-ray crystal structure analysis of 4 reveals that Cp*Si(OH) 3 and water molecules are hydrogen-bonded to form a multilayer arrangement with the pentamethylcyclopentadienyl groups forming the hydrophobic outer sheets and the silanetriol groups together with the water molecules forming the hydrophilic inner sheets.

Organosilanetriols: model compounds and potential precursors for metal-containing silicate assemblies

“…Moreover, the reactive N-SiMe 3 bonds in the resulting indium siloxane have been partially hydrolyzed over the period of crystallization (ca three months) to yield siloxane 44, which contains ArNH-groups. Three 29 Si NMR signals are observed for the three different types of silicon centers in this compound (d À73.9, À72.8, and 2.3 ppm). The molecular structure of indium siloxane 44 is made up of a central In 3 Na 3 O 10 Si 4 core which resembles the and three Na moieties to result in the observed cage structure.…”

“…20 Silanetriols in which silicon is bonded to carbon, nitrogen, oxygen or a transition metal have been reported in the literature. [21][22][23][24][25][26][27][28][29] The review by Lickiss covers the syntheses and structures of most of these silanetriols. 20 Depending on the type of functionality, the relative stability and reactivities of these compounds differ.…”

“…Additionally, 29 Si NMR provides a convenient tool for deducing their structures and the types of coordination environments around silicon atoms.…”

Facile syntheses, structural characterizations, and isomerization of disiloxane-1,3-diols

“…This data indicates that 2 has a very strong intramolecular hydrogen bonding in solution. In contrast, the 1 [12], and 4.30-5.30 ppm (aminosilanetriols) [13].…”

At the Edge of Stability – Preparation of Methyl‐substituted Arylsilanetriols and Investigation of their Condensation Behavior

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] A reason for this may originate from their high tendency to undergo condensation reactions to form stable siloxane bonds in the absence of steric protection. [18,19] If the Si(OH) 3 moiety is however sterically protected by bulky substituents, stable and chemically robust compounds can be easily obtained with applications ranging from bioactivity to supramolecular chemistry and surface modifications.…”