Poly (Aryleneethynylenesiloles): Synthesis And Spectroscopic Studies

Silole 7,8,9,10 beard halogens on the 2,5-position have been synthesized, and were used to synthesize asymmetrical siloles, some routes failed, the factors affecting the reactions were also discussed. Some factors affecting these reactions were also studied. On the other hand, Two kinds of poly(aryleneethynylenesiloles):hyperbranched conjugated polymer 14 and liner conjugated polymer 17, have been prepared, their structure were confirmed by the 1H NMR or MS.The FL and UV of the polysiloles were studied. TheλABmax of the polymer 14 and polymer 17 are 456nm and 462nm respectively. TheλFLmax of the polymer 14 and polymer 17 are 520 nm(excited at 466nm) and 545nm(excited at 472nm) respectively. These polymers were used to detect explosive, the detection limit can reach as low as 1 ppm, the Stern-Volmer constants of polymer 14 about PA and TNT are 4.7×10-2ppm-1 and 4.6×10-3ppm-1 respectively, the Stern-Volmer constants of polymer 17 about PA and TNT are 8.6×10-2ppm-1 and 6.5×10-3ppm-1 respectively. Liner polymer 17 was more sensitive to the PA than that of polymer 14 because of its less steric hindrance. The emission intensity of Polymer 14 and 17 in the THF/water mixtures with different fractions of water was tested, with low fraction of water, the emission of the polymers enhanced, and with high fraction of water, the emission of the polymers dropped.