Fluorescence of Helical Molecular Springs Under High Pressure

Abstract Although the unique structure of helicenes resembles molecular springs, the effects of their extension–contraction cycles on their properties have rarely been explored. Here, we investigated the fluorescence of two π‐extended [ n ]helicenes with different helical lengths n , named [7] and [9] , under high pressures in a diamond anvil cell. The experimental results showed that compound [9] , with a longer helical length, exhibited a more sensitive fluorescence response than [7] in both crystalline and solvated states upon compression. Theoretical calculations reveal that π–π overlapping at their helices in these molecular springs provides an additional contribution to their fluorescence properties under compression when the overlap becomes sufficiently strong. Our results provide insights into structure–property relationships of helical molecules under high‐pressure conditions and verify the potential of helicenes as molecular springs for future applications in molecular machines.

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Publication Details

Journal
Angewandte Chemie
Published
2025-03-11
DOI
https://doi.org/10.1002/ange.202500923
Primary Topic
Magnetism in coordination complexes
Type
article
Field-Weighted Citation Impact
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article

Fluorescence of Helical Molecular Springs Under High Pressure

Tobias Eklund, Katrin Amann‐Winkel, Cheng‐Wei Ju, Weizhao Cai et al.
Angewandte Chemie
Magnetism in coordination complexes
article

Fluorescence of Helical Molecular Springs Under High Pressure

Tobias Eklund, Katrin Amann‐Winkel, Cheng‐Wei Ju, Weizhao Cai, Zonghang Liu, Tanja Weil, Aigerim Karina, Jiaxu Liang, Wenhao Zheng, Zijie Qiu, Manfred Wagner, Hailong Li, K. Müllen
article en

Abstract

Abstract Although the unique structure of helicenes resembles molecular springs, the effects of their extension–contraction cycles on their properties have rarely been explored. Here, we investigated the fluorescence of two π‐extended [ n ]helicenes with different helical lengths n , named [7] and [9] , under high pressures in a diamond anvil cell. The experimental results showed that compound [9] , with a longer helical length, exhibited a more sensitive fluorescence response than [7] in both crystalline and solvated states upon compression. Theoretical calculations reveal that π–π overlapping at their helices in these molecular springs provides an additional contribution to their fluorescence properties under compression when the overlap becomes sufficiently strong. Our results provide insights into structure–property relationships of helical molecules under high‐pressure conditions and verify the potential of helicenes as molecular springs for future applications in molecular machines.

Angewandte ChemieVol. 137(21)
University of Electronic Science and Technology of China (CN), Stockholm University (SE), University of Cologne (DE), Johannes Gutenberg University Mainz (DE), University of Chicago (US), Max Planck Institute for Polymer Research (DE), Chinese University of Hong Kong, Shenzhen (CN), Spiber Technologies (Sweden) (SE), Djurkliniken Roslagstull (SE)
Openalex Percentile: Top 98%
Magnetism in coordination complexes
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