本文中,我们报告了一系列Ru(II)和Os(II)连接的卷曲螺旋肽中的能量转移研究,其中超分子支架控制装配的功能特性。据报道,使用固相肽合成法和铜催化的叠氮化物-炔烃环加成反应,可将位点特异性掺入联吡啶Ru(II)和Os(II)配合物的通用方法。超分子组装定位发色团以进行能量转移。使用时间分辨发射光谱,我们测量了位置依赖性能量传递,该能量传递可通过肽支架序列的变化而变化。高水平的分子动力学模拟与光谱技术结合使用,可以从分子水平上洞悉所观察到的能量转移趋势。k EnT = 2.3×10 7 s –1(42 ns))。另外,Ru(II)和Os(II)肽的发射猝灭可以适合于结合模型,该模型与通过化学变性为肽确定的解离常数相符。
Interfacial Energy Conversion in RuII Polypyridyl-Derivatized Oligoproline Assemblies on TiO2
摘要:
Solid-phase peptide synthesis has been applied to the preparation of phosphonate-derivatized oligoproline assemblies containing two different Ru-II polypyridyl chromophores coupled via "click" chemistry. In water or methanol the assembly adopts the polyproline II (PPII) helical structure, which brings the chromophores into close contact. Excitation of the assembly on ZrO2 at the outer Ru-II in 0.1 M HClO4 at 25 degrees C is followed by rapid, efficient intra-assembly energy transfer to the inner Ru-II (k(EnT) = 3.0 x 10(7) s(-1), implying 96% relative efficiency). The comparable energy transfer rate constants in solution and on nanocrystalline ZrO2 suggest that the PPII structure is retained when bound to ZrO2. On nano crystalline films of TiO2, excitation at the inner Ru-II is followed by rapid, efficient injection into TiO2. Excitation of the outer Ru-II is followed by rapid intra-assembly energy transfer and then by electron injection. The oligoproline/click chemistry approach holds great promise for the preparation of interfacial assemblies for energy conversion based on a family of assemblies having controlled compositions and distances between key functional groups.