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Dehydropolymerization of 1,1-Dihydrotetraphenylsilole and 1,1-Dihydrotetraphenylgermole to Optoelectronic Copolymers Catalyzed by Colloidal Silver Nanoparticles

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The co-dehydrocoupling at ambient air atmosphere of 1,1-dihydrotetraphenylsilole 1 and 1,1-dihydrotetraphenylgermole 2 (9:1 mole ratio) with 2 mol% of AgNO3 in toluene at 90 °C produces optoelectronic poly(silole-co-germole)s 3 in high yield. The copolymer mainly has Si–Si bonds (and Si–Ge/Ge–Ge bonds in minor) along with the small portion of Si–O/Ge–O bonds in the polymer backbone chain. While Ag2SO4 is also a good catalyst as AgNO3 for the co-dehydrocoupling, AgI is a moderate catalyst. However, Cp2Co, Cp2Ni, Cp2ZrCl2/Red-Al, AgX (X = F, Cl, Br) and [email protected] do not show appreciable catalytic activity. The silver complexes (AgNO3, Ag2SO4, AgI) transformed to colloidal silver nanoparticles during the catalytic reaction. The co-dehydrocoupling of 1 and 2 with AgNO3 even at dry nitrogen atmosphere is occurred, supporting that the oxidation of NO3 ion to NO2 is only the possible oxygen source, but not from the adventitious moisture in air. All cyclodextrins (,, and forms) considerably deteriorated the co-dehydrocoupling of 1 and 2 probably by forming toluene-insoluble inclusion complexes and by encapsulating SiH2 moiety. The resulting copolymer emits green light at 521 nm and is electroluminescent at 523 nm, which is similar to the polysilole.
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Keywords: CNT-ENCAPSULATED SILVER IODIDE; CO-DEHYDROCOUPLING; COLLOID; COPOLYMER; ELECTROLUMINESCENCE; GREEN LIGHT; OLED; PHOTOLUMINESCENCE; POLY(SILOLE-CO-GERMOLE); POLYGERMOLE; POLYSILOLE; SILVER IODIDE; SILVER NANOPARTICLE; SILVER NITRATE; SILVER SULFATE

Document Type: Research Article

Publication date: 2010-05-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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