聚甲基(对甲苯基)硅烷的合成与荧光性质

Synthesis and fluorescence of poly(p-methyphenyl methyl silane)

采用钠缩合法 ,将甲基 (对甲苯基 )二氯硅烷进行均聚 ,或分别与二甲基二氯硅烷、甲基苯基二氯硅烷、二苯基二氯硅烷进行共聚 ,合成了 4种聚硅烷。用1HNMR、IR、GPC进行了结构表征 ,并研究了聚硅烷固体和溶液的荧光性质。结果表明 ,聚硅烷的聚集态和构象对其荧光性质有较显著的影响。苯基对位甲基的给电子效应使最大荧光发射波长 (λmax)略有红移 ;侧基的共轭作用和分子对称性可能也对其固体和溶液的λmax有较大影响 ;链长较长的聚硅烷荧光强度较大。

Poly(p-methyphenyl methyl silane),poly(dimethylsilane-co-p-methyphenyl methyl silane), poly(methyl phenyl silane-co-p-methyphenyl methyl silane) and poly(diphenylsilane-co-p-methyphenyl methyl silane)were synthesized by the sodium condensation reaction of the corresponding dichlorosilanes.The structure of the polysilane was characterized by 1H NMR,IR,and GPC.The fluorescence properties of the polysilanes in solid or toluene solution were studied.The result showed that the congregation and conformation of the polysilane had remarkable influence on its fluorescence properties.The donative para-methy group on phenyl caused λ_ em,the maximum emitting wave length of the polysilanehad a little Einstein shift,but not remarkable.The delocalization of the side groups and the symmetry of the polysilanes might also be the factors influencing their fluorescence properties obviously.Polysilane having the longer chain length would seem to have a higher intensity.