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Inter- and Intramolecular Interactions in Some Supramolecular Photochemical Systems

机译:在一些超分子光化学体系中的分子间和分子内相互作用

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In supramolecular systems, the interaction between different units modulates their photophysical properties, a) For plati-num(Ⅱ) complexes with ligands that have extended π systems, π-stacking and direct metal-metal interactions result in the formation of excimers with characteristically red-shifted luminescence. Time-resolved emission spectra show clear evidence of dual luminescence. b) In phthalocyanines to which electron-donating tetrathiafulvalene (TTF) groups have been fused, the luminescence is strongly quenched by intramolecular electron transfer. The luminescence can be switched on by oxidation of the TTF groups. c) The luminescence of ruthenium tris-bipyridyl derivatives is strongly influenced by the environment. Linked to biotin, the luminescence quantum yield of such a complex is enhanced by 30 % upon binding to avidin. Furthermore, the binding to avidin induces a circular-dichroism signal from the π-π~* transition of the initially racemic ruthenium tris-bipyridyl derivative.
机译:在超分子系统中,不同单元之间的相互作用调节其光物理性质,a)对于具有扩展π系统的配体的铂(Ⅱ)配合物,π堆积和直接的金属-金属相互作用导致形成特征为红色的准分子发光。时间分辨的发射光谱显示出双重发光的明显证据。 b)在已结合了供电子四硫富富烯(TTF)基团的酞菁中,发光通过分子内电子转移而被强烈淬灭。可以通过氧化TTF基团来开启发光。 c)钌三联吡啶衍生物的发光受到环境的强烈影响。与生物素连接后,这种复合物与抗生物素蛋白结合后的发光量子产率提高30%。此外,与抗生物素蛋白的结合从最初的外消旋钌三-联吡啶基衍生物的π-π-*跃迁诱导了圆二色性信号。

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