A Sol-Gel Synthesis for Thermally Stable Aniline/Silica Material

Aniline/silica sol-gel material was obtained. The aniline was immobilized on the silica surface using chloropropyltrimethoxysilane as bridge reagent. The base activator NaH was used to produce a fast SN₂ reaction between the base and the alkylorganosilane. The resulting modified silica was characterized by elemental analysis and infrared spectroscopy using an oven cell. The organic coverage on the surface was proportional to the organic precursor concentration. The aniline/silica materials are thermally stable up to 300°C, in high vacuum.     

Polysilsesquioxane containing tributylstannyl groups as intermediary derivative for organofunctionalization

Poly(phenylsilsesquioxane) containing tributylstannyl groups (TBPSQ) was a useful intermediate for the synthesis of organofunctionalized polysilsesquioxane ( 2 ). The reaction of TBPSQ and monochlorosilane ( 1 ), which possessed an organofunctional group, proceeded under mild and neutral conditions to give 2 with the elimination of tributylstannylchloride. The combined use of the different chlorosilanes 1 enabled the ready preparation of multifunctionalized polysilsesquioxanes 2 . The number‐average molecular weights and dispersions of 2 were almost the same as those of starting TBPSQ. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 40: 286–292, 2002     

Synthesis of organofunctionalized polysiloxane from polymeric tributylstannyl ester of silicic acid and chlorosilanes

Polymeric tributylstannyl ester of silicic acid (PTBS) was demonstrated to be an effective material for the preparation of functionalized polysiloxane derivatives (2). The reaction of PTBS and monochlorosilane (1), which possessed an organofunctional group such as the acetoxy or methylmethacrylate group, proceeded readily at room temperature under neutral conditions to give 2 with the elimination of the tributyltin group. The molecular weight of 2 estimated by GPC measurement was almost the same as that of starting PTBS. Such metal-exchange reaction was applicable for the incorporation of two kinds of silyl units into polysiloxane 2 by employing these monochlorosilanes 1 at the same time in the reaction. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 2363–2369, 1999     

多钒氧簇化学研究进展

多钒氧簇由于具有组成、结构和尺寸易于调控、氧化还原性以及低腐蚀性等优点,在光电、磁性、催化以及医药等领域具有广阔的应用前景,已成为多酸化学领域的研究热点之一。本文结合近年来国内外及本课题组关于多钒氧簇化学的研究,综述了多钒氧簇的合成、结构及性能研究进展,并对未来发展趋势进行了展望。     

多钒氧簇化学研究进展

多钒氧簇由于具有组成、结构和尺寸易于调控、氧化还原性以及低腐蚀性等优点,在光电、磁性、催化以及医药等领域具有广阔的应用前景,已成为多酸化学领域的研究热点之一。本文结合近年来国内外及本课题组关于多钒氧簇化学的研究,综述了多钒氧簇的合成、结构及性能研究进展,并对未来发展趋势进行了展望。