金属有机骨架的后合成修饰是调整其性能的重要方法。我们报告了作为改性工具的一氧化氮-炔烃环加成反应(NOAC),该反应既不需要应变炔烃也不需要催化剂。室温下腈氧化物与PEPEP-PIZOF-15和-19的反应证明了这一点。PIZOF-15和-19是基于Zr的多孔MOF(BET表面积分别为1740和960 m 2 g –1),由两个相互渗透的UiO型骨架组成,其接头类型为– O 2 C [PE-P( R 1,R 2)-EP] CO 2 –(P,亚苯基; E,亚乙炔基; R 1和R 2要与R中的中央苯环侧链1 = R 2 = OCH 2 C≡CH或R 1 = OCH 2 C≡CH和R 2 = O(CH 2 CH 2 O)3 Me)中。本文报道了使用苯甲酸作为调节剂的它们的合成及其表征。炔丙氧基(OCH 2C≡CH)侧链包含NOAC所需的乙炔部分。在PEPEP-PIZOF-15和-19存在下,通过
Click Chemistry as a Powerful Tool for the Construction of Functional Poly(p-phenyleneethynylene)s: Comparison of Pre- and Postfunctionalization Schemes
摘要:
1,3-Dipolar cycloadditions have been used to prepare a series of functionalized poly(p-phenyleneethynylene)s (PPEs). This was accomplished by employing a PPE with pendent triisopropyl-silylacetylene groups. The triisopropylsilyl groups can be removed in situ, exposing free alkynes in the side chains of the polymer to react with azides in a postpolymerization functionalization strategy in a 1,3-dipolar cycloaddition. The properties of these polymers were explored and compared to polymers of the same molecular structure but synthesized by a prepolymerization functionalization approach. Polymers of the same structure exhibit identical H-1 NMR, C-13 NMR, and IR spectra regardless of whether they were obtained by a conventional route or by postfunctionalization of a suitable PPE. UV-vis and fluorescence spectra are similar in solution. Postmodification through click chemistry, when compared to premodification, is an excellent method to produce functionalized, defect-free PPEs. Reaction of the azides with the main chain alkyne units is not observed.