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首页> 外文期刊>Chemistry: A European journal >Dimeric capsules with a nanoscale cavity for [60]fullerene encapsulation
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Dimeric capsules with a nanoscale cavity for [60]fullerene encapsulation

机译：具有用于[60]富勒烯封装的纳米级腔的二聚体胶囊

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The acid-assisted and guest-induced formation of superstructures was achieved by the addition of haloacetic acids to a toluene solution of the resorcin[4]arene derivatives 1 and [60]fullerenes. The formation of dimeric superstructures that encapsulated a nanosized guest molecule was observed when appropriate acids, such as haloacetic acids, and suitable guest molecules, such as [60]fullerenes, were coadded to a toluene solution of cavitand 1 that has four pyridine units, whereas a complicated equilibrium between several species was detected without [60]fullerenes, and the formation of discrete superstructures was not monitored in the absence of haloacetic acids. The spectroscopic data indicate that the formed [60]fullerene-encapsulated complexes have the structure of 2. These complexes are self-assembled through pyridinium-anion-pyridinium interactions and by pi-pi and van der Waals interactions. The rate of decomplexation of 2 is estimated to be 3.1 s(-1) from a 2D exchange NMR spectrum. The [60]fullerene encapsulation process can be controlled by modifying the amounts of acids used, changing the temperature of the system, altering the ratio of acid/base, and even through varying the solvent polarity. Moreover, the fluorescence spectra show band-narrowing spectral changes and a retardation of the relaxation characteristics of isolated and isotropic [60]fullerenes, which indicates that the environmental change around [60]fullerene is induced upon its encapsulation.
机译：通过将卤代乙酸添加到间苯二酚[4]芳烃衍生物1和[60]富勒烯的甲苯溶液中，实现了酸辅助和客体诱导的上层结构的形成。当将合适的酸（例如卤乙酸）和合适的客人分子（例如[60]富勒烯）共混到具有四个吡啶单元的cavitand 1的甲苯溶液中时，观察到了包裹纳米级客体分子的二聚体超结构的形成。在没有[60]富勒烯的情况下，检测到几种物质之间存在复杂的平衡，并且在不存在卤代乙酸的情况下，未检测到离散的超结构的形成。光谱数据表明形成的[60]富勒烯包封的配合物具有2的结构。这些配合物通过吡啶鎓-阴离子-吡啶鎓相互作用以及通过π-π和范德华相互作用而自组装。从2D交换NMR光谱估计2的解复速率为3.1 s（-1）。通过改变所用酸的量，改变体系的温度，改变酸/碱的比例，甚至改变溶剂的极性，可以控制[60]富勒烯的包封过程。此外，荧光光谱显示窄带光谱变化和分离的和各向同性的[60]富勒烯的弛豫特性的延迟，这表明[60]富勒烯周围的环境变化是在其封装后引起的。

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