Robust Polyaromatic Octasilsesquioxanes from Polybromophenylsilsesquioxanes, BrxOPS, via Suzuki Coupling

Autor:	Chad M. Brick, Yuko Ouchi, Yoshiki Chujo, Richard M. Laine
Rok vydání:	2005
Předmět:	Biphenyl Photoluminescence Polymers and Plastics Organic Chemistry chemistry.chemical_element Oligomer Inorganic Chemistry chemistry.chemical_compound chemistry Suzuki reaction Octahedron Polymer chemistry Materials Chemistry Thiophene Thermal stability Boron
Zdroj:	Macromolecules. 38:4661-4665
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma0501141
Popis:	Polybromophenylsilsesquioxane (BrxOPS), where x = 5.3 (p:m = 65:25), because of its octahedral structure and nanometer size, represents a potentially very useful nanoconstruction site. We report here that Br5.3OPS reacts readily with borates of phenyl, biphenyl, naphthyl, 9,9-dimethylfluorene, and thiophene using standard Suzuki conditions to produce the corresponding polyaromatic and heteroaromatics with complete substitution of all bromines. The resulting materials, because of the 3-D octahedral structure, are completely soluble in a variety of common organic solvents. They are also stable to temperatures exceeding 400 °C in air, making them quite robust and easily processable. UV−vis spectra of these materials are red-shifted 20−30 nm from the simple organics, suggesting some conjugation with the silica cage core. Photoluminescence measurements show standard aromatic π−π* behavior with typical quantum efficiencies except for the 9,9-dimethylfluorene compound, which has an unexpectedly high quantum effi...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::375ff52034d86812ee8f1f0d2081e4b1 https://doi.org/10.1021/ma0501141 Zobrazit plný text záznamu