Host-guest interaction of rotaxane assembly through selective detection of ferric ion: Insight into hemin sensing and switching with sodium ascorbate
作者:Tarun Shukla、Atul Kumar Dwivedi、Reguram Arumugaperumal、Chien-Min Lin、San-Yuan Chen、Hong-Cheu Lin
DOI:10.1016/j.dyepig.2016.03.049
日期:2016.8
of tetraphenylethylene and phenanthroimidazole units in the axle to exhibit significant emission bands and demonstrate host-guest interactions via its topologically constrained cavity, and thus to induce a significant and selective fluorescence quenching of rotaxane towards ferric ion (Fe3+). The quenching efficiencies of rotaxane with both ferric ion (Fe3+) and bio-molecular Hemin (containing ferric
机械联锁的宿主轮烷是通过在车轴中掺入四苯基乙烯和菲并咪唑单元而合成的,显示出显着的发射带,并通过其拓扑受限的腔展示了宿主与客体之间的相互作用,从而诱导轮烷向铁离子的显着且选择性的荧光猝灭( Fe 3+)。研究了轮状烷与铁离子(Fe 3+)和生物分子血红素(含铁离子)的猝灭效率,以比较轮烷对铁离子和生物分子血红素的敏感性。本研究可以探测轮烷与三价铁离子(Fe 3+)和Hemin,并监控在抗坏血酸钠(作为还原剂)存在下Hemin向Heme的生物转化,其中还原的无毒Heme可以由Hemin的有毒形式产生。
Efficient Transformation of Polymer Main Chain Catalyzed by Macrocycle Metal Complexes via Pseudorotaxane Intermediate
Post-synthesis modification of polymers streamlines the synthesis of functionalized polymers, but is often incomplete due to the negative polymer effect. Here, we show macrocycle-metal-complex-catalyzed systems for efficient transformation of main chain in polymer substrate, whereby higher-molecular-weight polymers reach completion faster. Mechanistic studies suggest the reactions proceed via the formation
Palladium-containing macrocycle catalysts (PdMCs) with different ring sizes ranging from 24 to 30 members were synthesized. The intramolecular hydroamination of an allylurethane (AU) catalyzed by PdMCs proceeded efficiently to afford the corresponding oxazolidinone (OZ) in 95% isolated yield. The dependence of the hydroamination of AU to OZ on the cavity size indicated that the reaction rate was clearly controlled by both substrate uptake and product release steps.