The differentiation of chemical species of interest, particularly for those are structurally similar, is still very challenging. Here we report that a corannulene-based cage possessing a character of conformational diversity...

C 60 ⊂COPY2-Pd 与 C 70 等物质的量混合或者络合物 C 70 ⊂COPY2-Pd 与 C 60 等物质的量混合于 90 ℃加热 48 h 后, 络合 物 C 60 ⊂COPY2-Pd 与 C 70 ⊂COPY2-Pd 的比例均为 4∶1. 将配体 COPY2 与 Pd(CH 3 CN) 2 Cl 2 加入等物质的量 C 60 和 C 70 混合物中加热平衡后, 络合物 C 60 ⊂COPY2-Pd 与 C 70 ⊂COPY2-Pd 的比例同样为 4∶1. 当 C 60 和 C 70 的比例为 2∶1 时, 体系中只生成络合物 C 60 ⊂COPY2-Pd; 而当 C 60 和 C 70 的比例为 1∶2 时, 平衡后络合物 C 60 ⊂COPY2-Pd 与 C 70 ⊂COPY2-Pd 的比例为 3.3∶1. 这些结果表明, 配体 COPY2 在金属钯存在时对 C 60 络合能力强于 C 70 的络合能力. 加 入 DMAP 能够实现络合物解离, 释放笼内富勒烯并回收 COPY2. 因此, 配体 COPY2 可应用于室温下对 C 60 的富集.

The approaches towards molecular brakes reported to date are not diversified enough. Fluoride is a unique species because it is an anion but can also act as a base. Herein a new strategy utilizing fluoride anions is reported to regulate the rotation of a kind of phenolsuccinimide-based molecular rotors, in which braking of the rotors was achieved by using fluorides to deprotonate the molecules to introduce an intramolecular electrostatic repulsion. Subsequent addition of lithium cations defunctionalized the fluoride anions, thus enabling the rotors to rotate fast again. By using cyclic fluoride-then-lithium mediation, transformation between the "brake-on" and the "brake-off" state of the rotors could be achieved in a highly reversible manner. The stimuli group is superior to regular acid/base in speed regulation of the rotors due to its higher efficiency and predictability of the usage.[a] S. Figure 1. (a) The structures of molecular rotors 1-3. (b) Illustration of fluoride-and-lithium-ions-mediated rotation of the rotors.

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