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Jun Lee, Jong-Hyun Kim, Soo-Yong Mo, Hee-Gweon Woo1, Do-Heyoung Kim, Jin Jun 조선대학교 기초과학연구원 2011 조선자연과학논문집 Vol.4 No.3
The catalytic dehydrocoupling of bis(1-sila-3-butyl)benzene 1 and 2-phenyl-1,3-disilapropane 2 by Cp2ZrCl2/Red-Al and Cp2ZrCl2/n-BuLi was reported to compare their catalytic efficiency. The dehydrocoupling of monomeric silanes 1 with the Cp2ZrC12/Red-Al and Cp2ZrCl2/n-BuLi combination catalysts produced two phases of polymers: one is a highly crosslinked insoluble solid, and the other is noncross-linked or slightly cross-linked soluble oil and could be a precursor for the solid polymer. The dehydrocoupling of 2 with the Cp2ZrCl2/n-BuLi combination catalyst similarly produced two phases of polymers. By contrast, the catalytic reaction of 2 with the Cp2ZrCl2/Red-Al combination catalyst produced a soluble polymer via redistribution/dehydrocoupling process.
Dehydrogenative Polymerization of New Alkylsilanes Catalyzed by ??
우희권,송선정 全南大學校 觸媒硏究所 1996 觸媒硏究 論文集 Vol.18 No.-
새로운 알킬 실란의 3-aryl-1-silabutanes 1-4을 합성하고 6족 전이금속 착물인 ??을 사용하여 탈수소 중합을 시켰다. 전이금속 4족 착물인 metallocene계 촉매에 비해 분자량이 현저히 증가된 실리콘 고분자를 얻을 수가 있었다. 6족 전이금속 촉매에 의한 탈수소 중합 메카니즘을 제시하였다.
Polymerization of Acrylic Acids by Chlorocarbon/Metallocene Combination Initiator
Woo, Hee-Gweon,Kim, Bo-Hye,Cho, Myoung-Shik,Kim, Min-Sook,Chung, Yun-Gil,Ham, Heui-Suk,Paek, Choon-Seon,Hwang, Teak-Sung,Jun, Moo-Jin,Li, Hong Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.9
Kim, Myoung-Hee,Woo, Hee-Gweon,Park, Woo Jin,Sohn, Honglae,Chu, Bryan Tsu-Te,Li, Hong,Ko, Young Chun American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.5
<P>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 degrees 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 AgI@MWCNT 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 (sigma, beta, and gamma 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.</P>
Efficient preparation and characterization of silver-polyphenylsilane nanocomposites.
Kim, Myoung-Hee,Woo, Hee-Gweon,Shin, Joong-Hyeok,Lee, Byeong-Gweon,Kim, Do-Heyoung,Yang, Kap-Seung,Jun, Jin,Ko, Young Chun,Sohn, Honglae American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.5
<P>Silver-polyphenylsilane nanocomposites have been effectively prepared by the dehydrocoupling reaction of phenylsilane (PS, PhSiH3) to polyphenylsilane (PPS, [PhSiH]n) in the presence of silver nitrate. The one-step reduction of Ag(+1) nitrate to stable Ag(0) nanoparticles is mediated by PS, resulting in the formation of Ag-PPS composites. The Ag-PPS nanocomposites were characterized by various analytical techniques such as XRD, TEM, FE-SEM, and solid-state UV-vis. TEM and FE-SEM data clearly show that the silver nanoparticles with the size of < 20 nm are well dispersed throughout the PPS matrix in the nanocomposites. XRD patterns are consistent with those for fcc crystalline silver. The size of silver nanoparticles increased with increasing the relative molar concentration of silver salts added. It was found that in the absence of PS, most of the silver nanoparticles undergo macroscopic precipitation by aggregation, indicating that PPS is essential to stabilize the silver nanoparticles by the complexation of Si-H to the silver metal centers.</P>