通过离散数量的环双环(百草枯)的穿线,制备了五种供体-受体低聚轮烷,它们由四甘醇链组成的哑铃组成,散布着三个和五个1,5-二氧萘单元,并被2,6-二异丙基苯氧基封端终止。 -对-亚苯基)环,然后进行依赖于点击化学反应的动力学控制的封堵方案。在五种低聚轮烷的最终动力学控制的模板导向合成过程中,采用了著名的铜(I)催化的炔-叠氮环在位于聚醚链末端的叠氮化物官能团与带有炔的塞子前体之间的环加成反应。随后1氘代乙腈中低温(233 K)的1 H NMR光谱。通过与哑铃和环组分的光谱比较,揭示了五种低聚轮烷的二级结构和构象。通过关注从广泛的低温光谱获得的一些关键探针质子化学位移的变化,可以看到五种低聚紫杉烷中的四种低聚紫杉烷的哑铃状质子在哑铃的质子内发生高度折叠的情况。被C的组合第五oligorotaxane表示在对照化合物的效果,带来环中缺乏π电子的联吡啶单元与哑铃中富含π电子的1,5-二氧萘单元
作者:Ali Trabolsi、Mohamad Hmadeh、Niveen M. Khashab、Douglas C. Friedman、Matthew E. Belowich、Nicolas Humbert、Mourad Elhabiri、Hussam A. Khatib、Anne-Marie Albrecht-Gary、J. Fraser Stoddart
DOI:10.1039/b819466a
日期:——
Two donor–acceptor thread-like compounds incorporating viologen (V2+) units and 1,5-dihydroxynaphthalene (DNP) stations have been prepared. Their ability to form self-assembled charge-transfer (CT) complexes with cucurbit[8]uril (CB[8]) is evidenced by UV-Vis and NMR spectroscopies, as well as by mass spectrometry. Binding studies show the formation of 1 : 1 and 2 : 1 complexes between CB[8] and a thread-like compound containing two viologen units, while only a 1 : 1 inclusion complex was observed between CB[8] and a thread-like compound containing only a single viologen unit. The switching behavior of the threads within their pseudorotaxane frameworks was investigated by using cyclic voltammetry (CV) and UV-Vis spectroscopy.
Coskun, Ali; Friedman, Douglas C.; Li, Hao, Journal of the American Chemical Society, 2009, vol. 131, p. 2493 - 2495
作者:Coskun, Ali、Friedman, Douglas C.、Li, Hao、Patel, Kaushik、Khatib, Hussam A.、Stoddart, J. Fraser
DOI:——
日期:——
Donor-Acceptor Oligorotaxanes Made to Order
作者:Subhadeep Basu、Ali Coskun、Douglas C. Friedman、Mark A. Olson、Diego Benítez、Ekaterina Tkatchouk、Gokhan Barin、Jeffrey Yang、Albert C. Fahrenbach、William A. Goddard、J. Fraser Stoddart
DOI:10.1002/chem.201001822
日期:2011.2.11
between the π‐electron‐deficient bipyridinium units in the rings and the π‐electron‐rich 1,5‐dioxynaphthalene units and polyether chains in the dumbbells. The secondary structures of a foldamer‐like nature have received further support from a solid‐state superstructure of a related [3]pseudorotaxane and density functional calculations performed thereon.
通过离散数量的环双环(百草枯)的穿线,制备了五种供体-受体低聚轮烷,它们由四甘醇链组成的哑铃组成,散布着三个和五个1,5-二氧萘单元,并被2,6-二异丙基苯氧基封端终止。 -对-亚苯基)环,然后进行依赖于点击化学反应的动力学控制的封堵方案。在五种低聚轮烷的最终动力学控制的模板导向合成过程中,采用了著名的铜(I)催化的炔-叠氮环在位于聚醚链末端的叠氮化物官能团与带有炔的塞子前体之间的环加成反应。随后1氘代乙腈中低温(233 K)的1 H NMR光谱。通过与哑铃和环组分的光谱比较,揭示了五种低聚轮烷的二级结构和构象。通过关注从广泛的低温光谱获得的一些关键探针质子化学位移的变化,可以看到五种低聚紫杉烷中的四种低聚紫杉烷的哑铃状质子在哑铃的质子内发生高度折叠的情况。被C的组合第五oligorotaxane表示在对照化合物的效果,带来环中缺乏π电子的联吡啶单元与哑铃中富含π电子的1,5-二氧萘单元
Structural and Co-conformational Effects of Alkyne-Derived Subunits in Charged Donor−Acceptor [2]Catenanes
作者:Ognjen Š. Miljanić、William R. Dichtel、Saeed I. Khan、Shahab Mortezaei、James R. Heath、J. Fraser Stoddart
DOI:10.1021/ja071319n
日期:2007.7.1
features in template-directed cyclizations of [2]pseudorotaxanes to give the [2]catenanes. Both reactions proceed well with precursors of appropriate oligoether chain lengths but fail when there are only three oxygen atoms in the oligoether chains between the DNP units and the reactive functional groups. The solid-state structures of the donor-acceptor [2]catenanes confirm their mechanically interlocked nature