The Polycondensation of Cyclohexylsilanetriol

Brown, John F.; Vogt, Lester H.

doi:10.1021/ja00947a016

Cited by 291 publications

(184 citation statements)

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“…Polyhedral oligomeric silsesquioxanes (or POSS for short) [1,2] have now been well established as versatile, nanostructured and oxidatively inert materials that can be readily synthesized on a large scale.…”

Section: Introductionmentioning

confidence: 99%

Versatile Phosphite Ligands Based on Silsesquioxane Backbones

et al. 2004

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Silsesquioxanes are employed as ligand backbones for the synthesis of novel phosphite compounds with 3,3'-5,5'-tetrakis(tert-butyl)-2,2'-dioxa-1,1'-biphenyl substituents. Both mono-and bidentate phosphites are prepared in good yields. Two types of silsesquioxanes are employed as starting materials. The monophosphinite 1 and the monophosphite 2 are prepared from the thallium silsesquioxide derived from a completely condensed silsesquioxane framework (c-C 5 H 9 ) 7 Si 7 O 12 SiOTl. The diphosphite 3 is synthesized starting with the incompletely condensed monosilylated disilanol (c-C 5 H 9 ) 7 Si 7 O 9 (OSiMePh 2 )(OH) 2 . For monophosphite 2, the corresponding trans-[PtCl 2 (2)] complex 4 is characterized by NMR spectroscopy as well as by Xray crystallography, as the first example of a completely condensed oxo-functionalized silsesquioxane framework. The coordination of the bidentate ligand 3 towards Pd, Mo and Rh is studied, both by NMR spectroscopy as well as by X-ray crystallography.

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Section: Introductionmentioning

confidence: 99%

Versatile Phosphite Ligands Based on Silsesquioxane Backbones

et al. 2004

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“…It is obtained by an aqueous-organic liquid boundary reaction via silicon-pyridine interaction compound. Our synthesis method is one-pot reaction, which is simple and generates a high yield rather than previous reports [3][4][5][6] The film derived from SQ has been studied for a long times, however they still keep our interest due to large expectation from their unique characteristic. In recent years, practical applications for semi-conductor interlayer dielectrics, photo-resist material and flat panel display industry have been proposed as LPSQ application.…”

Section: Fig1 Ladder-structure With Cis-syndiotactic Configurationmentioning

confidence: 99%

Characterization of Photosensitive Composition Based on Oligo-ladder Phenylsilsesquioxane

Tashiro

Miyazato

Ebitani

2015

J. Photopol. Sci. Technol.

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We have succeeded in development of alkalisoluble oligo-ladder phenylsilsesquioxane (oligo-LPSQ). Oligo-LPSQ was synthesized by the one-pot manner via silicon-pyridine adducts formation at aqueous-liquid boundary and finally product was obtained as white solid (85% yield) through re-precipitation in n-hexane. The obtained polymer is soluble in 2.38% TMAH (tetramethylammonium hydride). This polymer was characterized by MALDI-TOF/TOF-MS and 29SiNMR techniques. The properties of obtained polymer showed high thermal resistance over 400 °C and low dielectric constant under 3.2. Furthermore, the alkali soluble oligo-LPSQ can provide both positive and negative tone photosensitive LPSQ combination with diazonaphtoquinone (DNQ) and photo-acid (base) generator, respectively. Here we demonstrate features of synthesis method for alkali-soluble oligo-LPSQ, photolithographic character and the material properties.

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“…The fracture surfaces were coated with a thin platinum film in an auto fine coater (JEE-420T, JEOL, Japan). evidence multi siloxane linkages (Si≡(O) 3 ≡Si) of water-crosslinked EPR-g-VTMS [37] and/or a cissyndiotactic ladder configuration of poly(n-hexyl silsesquioxane) (see Scheme 2) [38][39][40]. The spectral difference between PhSO 3 H and PhNH 2 catalyst is consistent with our previous reports on the silane watercrosslinking reaction of EPR-g-VTMS in the presence of various sulfonic acid and amine compounds [41], which is understandable on the traditional knowledge of acid-and base-catalyzed silica sol-gel reaction [7].…”

Section: /28mentioning

confidence: 99%

Ethylene–propylene copolymer/ordered polysilsesquioxane nanocomposites prepared via organic acid‐ or base‐catalyzed binary silica water‐crosslinking reactions

Adachi

Hirano²,

Kasai³

et al. 2009

Polymer International

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BACKGROUND:In-situ silica sol-gel derived organic-inorganic hybrid materials, which comprise a vinyltrimethoxysilane-grafted ethylene-propylene copolymer (EPR-g-VTMS) and n-hexyltrimethoxysilane (HTMS), were successfully prepared in the presence of an organic acid and base catalyst. Benzenesulfonic acid (PhSO 3 H) and aniline (PhNH 2 ) were selected as the organic acid and base catalyst, respectively, to examine the progress and effect of progressive changes in the silane water-crosslinking reaction of EPR-g-VTMS/HTMS composites. RESULTS:The water-crosslinked EPR-g-VTMS/HTMS composites were characterized by means of attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), solid-state silicon-29 cross polarization/magic angle spinning-nuclear magnetic resonance ( 29 Si CP/MAS NMR), wide-angle X-ray scattering (WAXS), tensile strength, and field emission-scanning electron microscope (FE-SEM) measurements. CONCLUSION:These results revealed that the type of catalyst has a substantial influence on the nature of siloxane bands and eventually the physical tensile properties of the water-crosslinked EPR-g-VTMS/HTMS composites, which can be explained mainly on the knowledge of the traditional acid-and base-catalyzed silica sol-gel reaction. Moreover, the in-depth analysis for the PhNH 2 -catalyzed composites indicated the formation of ladder-type poly(n-hexyl silsesquoxane)s and the presence of the highly-ordered structure with a thickness equal to the length of two n-hexyl groups in all-trans conformation. In the present study, we demonstrated a potential for future design of highly-ordered silicate-based organic-inorganic hybrid nanocomposites.3/28

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The Polycondensation of Cyclohexylsilanetriol

Cited by 291 publications

References 4 publications

Versatile Phosphite Ligands Based on Silsesquioxane Backbones

Versatile Phosphite Ligands Based on Silsesquioxane Backbones

Characterization of Photosensitive Composition Based on Oligo-ladder Phenylsilsesquioxane

Ethylene–propylene copolymer/ordered polysilsesquioxane nanocomposites prepared via organic acid‐ or base‐catalyzed binary silica water‐crosslinking reactions

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