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- Title
Marriage of Heterobuckybowls with Triptycene: Molecular Waterwheels for Separating C<sub>60</sub> and C<sub>70</sub>.
- Authors
Liu, Zhe; Song, Wenru; Yang, Shaojie; Yuan, Chengshan; Liu, Zitong; Zhang, Hao‐Li; Shao, Xiangfeng
- Abstract
Exploration of π‐conjugated polycycles, particularly those have π‐frameworks spread over the three‐dimensional space, is essential in materials science and synthetic chemistry as these chemical entities possess featured optoelectronic properties and supramolecular assembly. Herein, the bowl‐shaped trichalcogenasumanenes are fused onto three branches of triptycene through pyrazine units, affording waterwheel‐like three‐dimensional polycycles 4 a/4 b. Because the three branches on 4 a/4 b are chemically equal, the molecular orbitals of 4 a/4 b show degenerate feature that results in the strong UV‐Vis absorbance at steady state. 4 a/4 b exhibit photo‐induced charge‐separation and subsequent charge‐redistribution at transient state, leading to excited state absorption in NIR‐II window (1165–1400 nm). 4 a/4 b are excellent fullerene receptors, and they form 1 : 1 host‐guest complexes with C60/C70 as proved by spectroscopic titrations and single crystal structure analysis. Moreover, 4 a/4 b show much stronger affinity toward C70 than C60. Consequently, 4 a/4 b are able to separate C60 and C70 from their mixture, giving the purity of C60 up to 99.5 %.
- Subjects
MATERIALS science; MOLECULAR orbitals; EXCITED states; CRYSTAL structure; SINGLE crystals; FULLERENES
- Publication
Chemistry - A European Journal, 2022, Vol 28, Issue 20, p1
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202200306