作者:Kenneth A. Murray、Andrew B. Holmes、Stephen C. Moratti、Garry Rumbles
DOI:10.1039/a902683e
日期:——
Regioregular polythiophene copolymers 10a-d containing hexyl and 11-hydroxyundecyl side chains have been synthesised, by nickel-catalysed cross-coupling of well-defined Grignard intermediates. The hydroxy groups were protected during the polymerisation as tetrahydropyranyl ethers, and subsequently transformed into azide groups. These azide-functionalised copolymers 11a-d were heated under vacuum, leading to azide decomposition, nitrene formation and crosslinking. The resultant polymer films showed decreased solubility (or insolubility) and a shift in the absorption spectrum to shorter wavelengths dependent on the azide content of the polymer. This colour change is rationalised in terms of the conformational change in the polythiophene backbone, associated with thermochromism, which has been partially fixed by the crosslinking at high temperature. This is supported by the modified thermochromism and photoluminescence behaviour of the crosslinked polymer films.
通过镍催化的精确Grignard中间体的交叉耦合,合成了含有己基和11-羟基十一烷基侧链的规整聚噻吩共聚物10a-d。在聚合过程中,羟基被保护为四氢吡営醚,随后转化为叠氮基团。这些叠氮功能化的共聚物11a-d在真空下加热,导致叠氮分解、氮烯形成和交联。生成的聚合物膜显示出降低的溶解性(或不溶性),并且吸收光谱向短波长偏移,具体取决于聚合物中的叠氮含量。这种颜色变化可以通过聚噻吩主链的构象变化来解释,这种变化与热致变色性相关,并且在高温下的交联部分固定了这种变化。这得到了交联聚合物膜的改性热致变色性和光致发光行为的支持。