Synthesis and structural characterization of functionalized cyclotetrasiloxane rings [4-RC6H4Si(O)OR′]4 (R=Cl, Br, CHCH2, CH2Cl; R′=Na, SiMe3) as scaffolds for the synthesis of models of a silica bound monolayer of fluorescent or second order NLO active organic chromophores

Cage octaphenylsilsesquioxane from cyclic tetrasiloxanetetraol and its sodium salt

“…Typical example is the 4-bromosubstituted phenyl derivative [17]. Alkali metal salt of 4-bromosubstituted phenyl-T 4 -tetraol could be isolated as solid crystalline material, but neutralization gave complex oligomeric condensed products.…”

Alkali-Metal-Directed Hydrolytic Condensation of 3-Mercaptopropyltrimethoxysilane

“…The reaction was carried out in ethanol using 3-mercaptopropyltrimethoxysilane as the siloxane precursor and sodium or potassium hydroxide as an alkali metal source. The second procedure was described by Pozdnyakova et al [34] for the synthesis of potassium cyclosiloxanolates with vinyl groups. The reaction was performed in a mixture of hexane and ethanol as a reaction medium, using potassium hydroxide as MtOH.…”

“…No literature data on WAXS analysis are available for cyclosiloxanolates that could be directly compared to our results. All data that could be found refer to cyclosilanols [34] or trimethylsilyl derivatives of cyclotetrasiloxanolates [30,34]. X-Ray diffraction patterns of these compounds exhibit typically a set of two diffraction peaks, near 2 8-12 o (d=7-12Å) and near 2 15-18 o (d=5-6Å).…”

“…The syntheses of cyclotetrasiloxanolates functionalized at the Si atom with simple alkyl [34][35][36][37] and aryl [30,33,34] [33,34], iBu [33,34,36], Me [37], Vi [37], Et [37], iPr [37] tions. The presence of thiol groups in side chains would enable their functionalization by thiol-ene and thiol-yne addition, and thereby preparation of LPSQs with a large variety of functional groups.…”

Electrical Characterizations of Schottky Diodes οn ITO Modified by Aromatic SAMs

“…1). We synthesized the MPPBA [10] and THIBSi [11] molecules according to the previously published procedures. Atomic force microscopy surface characterization was performed in semi-contact (tapping) mode operation using commercial Scanning Probe Microscopy instrument (Solver Pro 7 from MNT-MDT, Russia).…”