Synthesis and Properties of Oligomers Containing 3-Triethylsilyl-1-silacyclopent-3-ene and Borane Derivatives via Polyaddition Reaction

摘要

Polyaddition reactions of 1,1-diethynyl-3-triethylsilyl-1-silacyclopent-3-ene with several organoborane derivatives have afforded the oligomeric materials containing organosilacyclic group and organoboron moiety along the oligomer main chains. All of these materials are soluble in THF as well as chloroform, and their molecular weights are in the range of 1,990/1,190-21,950/7,050 (Mw/Mn) with the polydispersity indexes of 1.67-3.43. The prepared oligomers are characterized by several spectroscopic methods such as 1H, 13C, 29Si, 11B NMR and FTIR spectra along with elemental analysis. FTIR spectra of all the oligomers show that the new strong C=C stretching frequencies appear at 1599-1712 cm?1, in particular. The UV-vis absorption spectra of the materials in THF solution exhibit the strong absorption bands at the ルmax of 268-275 nm. The oligomeric materials show that the strong excitation peaks appear at the ルmax of 255-279 nm and the strong fluorescence emission bands at the ルmax of 306-370 nm. All the spectroscopic data suggest that the obtained materials contain both the organoboron ヰ-conjugation moiety of C=C-B-C=C and the organosilacyclic group of 3-triethylsilyl-1-silacyclopent-3-ene along the oligomer main chains. The oligomers are thermally stable up to 162-200 oC under nitrogen.