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Synthesis and characterization of functional polysilanes [RMe₂Si(CH₂)x(Me)Si]n (R = 2-Fu, 5-Me-2-Fu, 2-Th, 4-Me-2-Th; x = 2, 3) with appended furyl/thienyl groups on the carbosilyl side chains and their application in the generation and stabilization of palladium nanoparticles Part A Polymer chemistry

Shankar, Ravi, Shahi, Vandana
Journal of polymer science 2008 v.46 no.23 pp. 7816-7826
Fourier transform infrared spectroscopy, acetates, carbon, molecular weight, nanoparticles, nuclear magnetic resonance spectroscopy, palladium, polymers, silicon, sodium, spectral analysis, stable isotopes, thermogravimetry, toluene
The polysilanes [RMe₂Si(CH₂)x(Me)Si]n [x = 2, 3; R = 2-Fu (1, 2), 5-Me-2-Fu (3, 4)] bearing furyl-substituted carbosilyl side chains have been synthesized by dehalocondensation reaction (Wurtz coupling) of the corresponding carbosilanes using sodium dispersion in refluxing toluene. On the other hand, analogous polysilanes with appended thienyl groups [x = 2, 3; R = 2-Th (5, 6), 4-Me-2-Th (7, 8)] are only accessible by the reaction of the corresponding carbosilane precursors under mild Wurtz coupling conditions (THF, RT). These polysilanes reveal monomodal molecular weight distribution with Mw/PDI = 3.3-5.4 x 10⁴/1.22-1.47 (1-4) and 9.1-14.4 x 10⁴/1.45-1.61 (5-8) and are characterized by FT-IR, multinuclear (¹H, ¹³C{¹H}, ²⁹Si{¹H}) NMR, and UV/PL spectral studies as well as thermogravimetric analysis (TGA). Preliminary studies on the reactivity of polysilane 2 with palladium acetate (toluene, RT) reveal the formation of spherical palladium nanoparticles of size 8.2 ± 0.6 nm, which remain stable in solution for several weeks.