Citation: Zhenglin Du, Weijie Zhang, Yisong Tang, Xia Li, Jialin Xie, Kelong Zhu. [7]Cyclophenoxathiin: A heptagonal frustum-shaped nanobelt container for fullerenes[J]. Chinese Chemical Letters, ;2026, 37(5): 111499. doi: 10.1016/j.cclet.2025.111499 shu

[7]Cyclophenoxathiin: A heptagonal frustum-shaped nanobelt container for fullerenes

Zhenglin Du ^a ,
Weijie Zhang ^a ,
Yisong Tang ^a ,
Xia Li ^a ,
Jialin Xie ^{b, *,} ,
Kelong Zhu ^{a, *,}

a.
School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
b.
Hainan Provincial Key Laboratory of Fine Chem, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China

xiejialin@hainanu.edu.cn

zhukelong@mail.sysu.edu.cn

Received Date: 8 March 2025
Revised Date: 9 June 2025
Accepted Date: 23 June 2025
Available Online: 24 June 2025

Figures(7)

Nanobelts have attracted significant attention in both synthetic and supramolecular chemistry due to their distinctive structures and promising applications. However, their synthesis remains challenging due to the high strain inherent in their ribbon-like configurations. A promising approach to mitigate this strain involves incorporating heteroatoms, such as sulfur and oxygen, which not only alleviate strain but also introduce new functionalities. In this study, we report the synthesis of a novel C₂-symmetric nanobelt, [7]cyclophenoxathiin ([7]CP), through a multi-step process. The structure of [7]CP was confirmed using NMR, mass spectrometry, and single-crystal X-ray diffraction, revealing a heptagonal frustum-shaped geometry. Host-guest interactions between [7]CP and selected fullerenes were investigated using UV–vis absorption, ¹H NMR, and X-ray crystallography. Our findings demonstrate that [7]CP forms 1:1 complexes with fullerenes, exhibiting moderate binding through π−π interactions, with binding constants of 1638, 2534, and 3682 L/mol for C₆₀, C₇₀, and PC₆₁BM, respectively. The reduced cavity size of [7]CP prevents the formation of dimeric complexes observed with [7]cyclophenoxathiin, while still allowing it to function effectively as a molecular container.
- Nanobelt,
- Phenoxathiin,
- Host-guest complex,
- Fullerene,
- Heterocycle
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