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Self-Assembly of Chiral Depsipeptide Dendrimers

机译:手性二肽树状大分子的自组装

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The self-assembly of chiral depsipeptide dendrons 4,which contain a cyanuric acid building block at their focal point,with the homotritopic Hamilton receptor 1 is reported.The 1:3 compositions of the resulting chiral supramolecular dendrimers,the association constants K_n,and the cooperativi-ty of binding expressed by Scatchard plots and the Hill coefficients n_H was determined by NMR titration experiments.The most pronounced positive cooperativity was found for the complexes 1L_3 with L being the second-generation dendrons 4c-e.The least stable complexes are formed with the bulky third-generation dendrons 4f-h.Similar results are obtained by the corresponding complexation of the achiral Frechet-type first-to third-generation dendrons 3 with 1.Chiroptical investigations of 1:3 complexes of 1 and 4 reveal chirality transfer from the den-dron to the Hamilton receptor as demonstrated by the appearance of new CD absorption bands at 310 nm.
机译:报道了手性二肽树突4的自组装,该树突在其焦点处含有氰尿酸结构单元,具有同位三汉密尔顿受体1。所得手性超分子树状聚合物的1:3组成,缔合常数K_n和通过NMR滴定实验确定了Scatchard图和Hill系数n_H所表示的结合的协同作用。配合物1L_3的最显着的正协同作用,其中L为第二代树枝状化合物4c-e,形成的稳定性最差。通过将非手性Frechet型第一至第三代树突3与1进行相应的络合获得相似的结果。对1和4的1:3配合物进行的定律研究表明手性转移从树突到汉密尔顿受体,如310 nm处新的CD吸收带的出现所证明。

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