2,5-Dibromo-1,1-disubstitued-3,4-diphenyl-siloles (e.g, diethyl, dihexyl) as monomers were prepared by intramolecular reductive cyclization reactions of disubstituted-bis(phenylethynyl)silanes using lithium naphthalenide, anhydrous ZnCl2, and N-bromosuccinimide (NBS), respectively. Co-oligomerization reactions of 2,5-dibromo-1,1-disubstitued-3,4-diphenyl-siloles with 4,4'-(hexafluoro-isopropylidene)diphenol or 4,4'-biphenol were carried out by the nucleophilic substitution reaction of two bromine groups in the presence of potassium carbonate under the co-solvent of N-methyl-2-pyrrolidinone (NMP) and toluene by azeotrope using Dean-Stark trap. The crude oligomeric products were purified by extraction using the solvents of tetrahydrofuran and dichloromethane, and washed with deionized water. The oligomeric product materials were characterized by 1H, 13C, and 29Si NMR as well as GPC. We also studied the photoelectronic properties by UV-vis absorption, excitation, and fluorescence emission spectroscopic methods, in particular.

Co-oligomerizations of 2,5-dibromo-1,1-disubstituted-3,4-diphenyl-siloles with 4,4'-(hexafluoroisopropylidene)diphenol or 4,4'-biphenol and their characteristics

2019 Fall National Meeting

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