161678-38-2Relevant articles and documents
Synthesis and characterization of hybrid congo red from chloro-functionalized silsesquioxanes
Gueltek, Ahmet
, p. 437 - 445 (2010)
Congo red dye has been bonded to the functionalized octameric polyhedral silsesquioxanes (POSS), which were prepared by hydrolytic condensation of chloro-functionalized organosilicon monomers in the presence of a catalyst. The binding reaction of congo red to the POSS with chloro groups was achieved via the addition of the congo red via NaCl elimination. The structures of POSS with chloro side groups provided an attractive site for binding congo red that not only retains some of its characteristic properties, but also has exceptional hybrid properties possessed by the silica. The dye characteristics of the material were determined by means of UV spectroscopy as well as other conventional techniques. TUBITAK.
Environment-induced nanostructural dynamical-change based on supramolecular self-assembly of cyclodextrin and star-shaped poly(ethylene oxide) with polyhedral oligomeric silsesquioxane core
Yuan, Weizhong,Liu, Xu,Zou, Hui,Ren, Jie
, p. 5374 - 5381 (2013)
The star-shaped amphiphilic inorganic-organic hybrid polymer POSS-(PEO)8 prepared via click chemistry can self-assemble into spherical aggregates by directly dissolving the hybrid polymer in water. The regular spherical aggregates were gradually transformed to deformed spherical aggregates, cylinders and sheets through adding different amount of α-CD molecules into the POSS-(PEO)8 spherical aggregates solution due to the host-guest inclusion complexation between POSS-(PEO)8 aggregates and α-CD. Adding different amount of phenol which captured α-CD from PEO chains or increasing the environmental temperature of the self-assemblies solutions which also led to the slipping of α-CD out of PEO can reversibly and dynamically change the sheets to cylinders, deformed spherical aggregates or regular spherical aggregates, showing that the reversibly nanostructural dynamical-change can be induced by altering the environmental conditions of the solutions.
From an octakis(3-cyanopropyl)silsesquioxane building block to a highly COOH-functionalized hybrid organic-inorganic material
Boullanger, Arnaud,Gracy, Guillaume,Bibent, Nicolas,Devautour-Vinot, Sabine,Clement, Sebastien,Mehdi, Ahmad
, p. 143 - 150 (2012)
A new nanostructured and highly COOH-functionalized hybrid organic-inorganic material has been synthesized by the hydrolysis of oligomeric octahedral silsesquioxane (POSS), which contains eight cyanopropyl groups. The hybrid, elemental building block oligomeric octakis(3-cyanopropyl)silsesquioxane (CN-POSS) was synthesized from oligomeric octakis(3-chloropropyl)silsesquioxane (Cl-POSS) by an exchange reaction. The formation and nanostructuration of the COOH-functionalized hybrid material were induced by noncovalent hydrogen bonding between COOH-POSS units without decomposition of the core. The material has been fully characterized by scanning electron microscopy, FTIR and 1H, 13C, and 29Si solid-state NMR spectroscopy, X-ray diffraction, and elemental analysis, which confirm that the POSS core remains intact after each chemical modification step. Thermogravimetric analysis indicates that the organic units are thermally stable up to 200 °C. The activation energy related to the proton conductivity of COOH-POSS has been evaluated and confirms the presence of strong hydrogen bonds. Finally, the accessibility and adsorption capacity of the COOH groups towards transition metal ions have been demonstrated and underline the potential of these hybrid materials in extraction chemistry.
An oligosilsesquioxane cage functionalized with molybdenum(II) organometallic fragments
Dias Filho, Newton L.,Portugal, Fatima C. M.,Nogueira,Brandao, Paula,Felix, Vitor,Vaz, Pedro D.,Nunes, Carla D.,Veiros, Luis F.,Brito, Maria J. Villa De,Calhorda, Maria Jose
, p. 4495 - 4503 (2012)
A silsesquioxane cage polymer functionalized with eight chloropropyl arms (1, T8-PrCl) reacted with 2,2′-dipyridiylamine (DPA) to afford a new derivative with eight pendant linear chains (2, T8-Pr-DPA). Further reaction with [Mo(η3-C3H5)Br(CO) 2(NCMe)2] afforded another derivative containing three molybdenum units (3, T8-Pr-DPA-Mo), after substitution of the two nitrile ligands in each complex. These are the first silsesquioxane species containing DPA and the Mo(η3-C3H5)Br(CO) 2 fragment. The three materials were characterized by 1H, 13C, 29Si, and 95Mo NMR, FTIR, XRD, and elemental analysis, and T8-PrCl (1) was also structurally characterized by single-crystal X-ray diffraction. It was identified as a low-temperature polymorph of this material. Elemental analysis indicated that all Cl atoms in the parent material T8-PrCl (1) were substituted by the deprotonated DPA group in T8-Pr-DPA (2). However, only three [Mo(η3-C3H5)Br(CO)2(DPA)] units were detected in T8-Pr-DPA-Mo (3). A comprehensive NMR study, complemented with DFT calculations, was carried out in order to detect the effect of Mo coordination on the cage silicon and on the protons and carbons of the propyl chain, but no significant effects were observed. Both 1H and 29Si chemical shifts vary upon introducing DPA but remain the same after reaction with the Mo(II) precursor. The 95Mo NMR data reveal that the metal is not sensitive to the cage. The catalytic activity of 3 was tested as a precursor in the epoxidation of cyclooctene and styrene in the presence of TBHP. Despite the high selectivity toward the epoxides, the conversion and turnover frequencies were low, reflecting the behavior of the [Mo(η3-C3H5)Br(CO)2(DPA)] complex.
Functionalization of polyhedral oligomeric silsesquioxane (POSS) via nucleophilic substitution
Dutkiewicz, Michal,Maciejewski, Hieronim,Marciniec, Bogdan
, p. 2019 - 2024 (2009)
Octakis(3-chloropropyl)octasilsesquioxane, obtained recently by a new method, has enabled a highly efficient synthesis of a whole family of cube-like T8 silsesquioxanes by nucleophilic substitution of chlorine atom with appropriate nucleophilic agents. Fi
Inducing enantioselective crystallization with and self-assembly of star-shaped hybrid polymers prepared via “grafting to” strategy
Zou, Hui,Liang, Wen-Quan,Wu, Qi-Liang,Zhou, Li,Hou, Xiao-Hua,Liu, Na,Wu, Zong-Quan
supporting information, p. 61 - 69 (2021/11/10)
Helical polymers present some interesting and distinctive properties, and one of the most distinguished applications of them is the chiral recognition and resolution of enantiomers. In this work, star-shaped hybrid helical poly (phenyl isocyanide) (PPI) with polyhedral oligomeric silsesquioxanes (POSS) as the core was designed and synthesized by “grafting to” strategy. The homoarm star-shaped hybrid POSS-(PPI)8 was first obtained by the click reaction between azide-modified POSS (POSS-(N3)8) and alkynyl-modified PPI (PPI-Alkynyl). The hybrid POSS-(PPI)8 was with predominated left-handed helical conformation and exhibited excellent ability in the enantioselective crystallization of racemic compounds. In the meantime, heteroarm star-shaped hybrid (PEG)4-POSS-(PPI)4 was prepared by the click reaction of POSS-(N3)8 with PPI-Alkynyl and alkynyl-modified poly (ethylene glycol) (PEG-Alkynyl). The hybrid (PEG)4-POSS-(PPI)4 was amphiphilic, and it could self-assemble to form spherical micelles in aqueous solutions.
Synthesis and characterization of organic/inorganic hybrid materials based on polyhedral oligomeric silsesquioxane (POSS) and poly(ethylene glycol) via click chemistry
Mohammadi Ziarani, Ghodsi,Asadi, Shima,Badiei, Alireza,Nabid, Mohammad Reza
, p. 393 - 401 (2019/07/31)
Cu(I)-catalyzed alkyne?azide Huisgen 1,3-dipolar cycloaddition (CuAAC) was used for the creation of POSS-PEG architecture. Herein, we presented the preparation of functionalized mono and bis PEG2000 with maleic anhydride. Then the mono and dialkyne-terminated compounds were produced by the treatment with propargyl alcohol. Finally, click reaction occurred between azide end-functionalized polyhedral oligomeric silsesquioxane [POSS-(N3)8] and alkyne-terminated compounds. The resultant products were characterized by 1H NMR, FT-IR, SEM, EDX, TGA and DTA.
