Grignard Metathesis Polymerization and Properties of 1,1-Disubstituted-2,5-dibromo-3,4-diphenylsiloles
作者:Young Tae Park
DOI:10.5012/bkcs.2014.35.6.1825
日期:2014.6.20
Grignard metathesis polymerizations of 1,1-disubstituted-2,5-dibromo-3,4-diphenylsiloles such as 1,1-dimethyl-2,5-dibromo-3,4-diphenylsilole, 1,1-diethyl-2,5-dibromo-3,4-diphenylsilole, 1,1-diisopropyl-2,5-dibromo-3,4-diphenylsilole, and 1,1-dihexyl-2,5-dibromo-3,4-diphenylsilole were performed to yield poly(1,1-disubstituted-3,4-diphenyl-2,5-silole)s containing fluorescent aromatic chromophore groups such as phenyl and silole in the polymer main chain: poly(1,1-dimethyl-3,4-diphenyl-2,5-silole), poly(1,1-diethyl-3,4-diphenyl-2,5-silole), poly(1,1-diisopropyl-3,4-diphenyl-2,5-silole), and poly(1,1-dihexyl-3,4-diphenyl-2,5-silole), respectively. The obtained materials are highly soluble in common organic solvents such as chloroform and tetrahydrofuran. Fourier-transform infrared spectra of all the polymers have characteristic C=C stretching frequencies at $1620-1628cm^-1}$. The prepared organosilicon polymers exhibit strong absorption maximum peaks at 273-293 nm in the tetrahydrofuran solution, showing a red-shift of 18-34 nm relative to those of the monomer, strong excitation maximum peaks at 276-303 nm, and strong fluorescence emission maximum bands at 350-440 nm. Thermogravimetric analysis shows that most of the polymers are stable up to $200^\circ}C$ with a weight loss of 6-16% in nitrogen.
1,1-二取代-2,5-二溴-3,4-二苯基硅咯例如1,1-二甲基-2,5-二溴-3,4-二苯基硅咯、1,1-二乙基-2,5的格氏复分解聚合-二溴-3,4-二苯基硅杂环戊二烯、1,1-二异丙基-2,5-二溴-3,4-二苯基硅杂环戊二烯和1,1-二己基-2,5-二溴-3,4-二苯基硅杂环戊二烯进行了反应,得到聚聚合物主链中含有苯基、硅咯等荧光芳香族发色团的(1,1-二取代-3,4-二苯基-2,5-硅咯):聚(1,1-二甲基-3,4-二苯基- 2,5-噻咯)、聚(1,1-二乙基-3,4-二苯基-2,5-噻咯)、聚(1,1-二异丙基-3,4-二苯基-2,5-噻咯),和分别为聚(1,1-二己基-3,4-二苯基-2,5-硅咯)。所得材料在氯仿、四氢呋喃等常见有机溶剂中具有良好的溶解性。所有聚合物的傅里叶变换红外光谱在$1620-1628cm^-1}$处具有特征C=C伸缩频率。所制备的有机硅聚合物在四氢呋喃溶液中在273-293 nm处表现出强吸收最大峰,相对于单体出现18-34 nm的红移,在276-303 nm处有强激发最大峰,并具有较强的荧光发射最大波段在 350-440 nm。热重分析表明,大多数聚合物在 $200^\circ}C$ 下仍保持稳定,在氮气中失重 6-16%。