A ternary co polysilane was synthesized by the Wurtz type coupling reaction and characterized by FI IR , XRD, TEM, UV and fluorescence spectroscopy. The results show the copolysilane is amorphous and partly ordered in...A ternary co polysilane was synthesized by the Wurtz type coupling reaction and characterized by FI IR , XRD, TEM, UV and fluorescence spectroscopy. The results show the copolysilane is amorphous and partly ordered in structure. The TEM image indicates the copolysilane possesses a rodlike structure. It decomposes at temperature near 300 ℃, has a better thermal stability than polymers with —C—C— main chain. The UV spectrum of the copolysilane displays a strong and broad absorption range. It emits strong fluorescence at 420 nm and could be a kind of promising photoluminescence material.展开更多
Several diamidodisilanes and azocyclosilane were prepared from the resultants of Wurtz coupling reaction between dichlorosilane and sodium and characterized by 1H NMR and FT-IR. The two split peaks of the stretching v...Several diamidodisilanes and azocyclosilane were prepared from the resultants of Wurtz coupling reaction between dichlorosilane and sodium and characterized by 1H NMR and FT-IR. The two split peaks of the stretching vibration bonds of Si-H bonds in compounds 1 and 3 were firstly found at ～2163 cm-1 and ～2100 cm-1 respectively. The density functional theory was adopted to calculate the several stable geometrical isomerism structures of compounds 1 and 3. The results of the calculations show that the peak split of Si-H bonds stretching vibration absorption was caused by the different geometrical isomers of the compounds and the calculated IR spectra of compounds 1 and 3 are much closer to the experimental results. The processes of hydrolysis and polycondensation reactions of the synthetic compounds were studied by FT-IR. At the same time, the transition of Si-H bonds split peaks was observed in this procedure. As the results of the hydrolysis and condensation reactions, a new type of organic silicon polymer, polyoxydisilane was obtained, which presents the photoluminescence of the polysilanes.展开更多
文摘A ternary co polysilane was synthesized by the Wurtz type coupling reaction and characterized by FI IR , XRD, TEM, UV and fluorescence spectroscopy. The results show the copolysilane is amorphous and partly ordered in structure. The TEM image indicates the copolysilane possesses a rodlike structure. It decomposes at temperature near 300 ℃, has a better thermal stability than polymers with —C—C— main chain. The UV spectrum of the copolysilane displays a strong and broad absorption range. It emits strong fluorescence at 420 nm and could be a kind of promising photoluminescence material.
基金This work was supported by the Key Science and Technology Project of Shanghai(Grant No.02dzI1002).
文摘Several diamidodisilanes and azocyclosilane were prepared from the resultants of Wurtz coupling reaction between dichlorosilane and sodium and characterized by 1H NMR and FT-IR. The two split peaks of the stretching vibration bonds of Si-H bonds in compounds 1 and 3 were firstly found at ～2163 cm-1 and ～2100 cm-1 respectively. The density functional theory was adopted to calculate the several stable geometrical isomerism structures of compounds 1 and 3. The results of the calculations show that the peak split of Si-H bonds stretching vibration absorption was caused by the different geometrical isomers of the compounds and the calculated IR spectra of compounds 1 and 3 are much closer to the experimental results. The processes of hydrolysis and polycondensation reactions of the synthetic compounds were studied by FT-IR. At the same time, the transition of Si-H bonds split peaks was observed in this procedure. As the results of the hydrolysis and condensation reactions, a new type of organic silicon polymer, polyoxydisilane was obtained, which presents the photoluminescence of the polysilanes.
