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Pyrene magic: chiroptical enciphering and deciphering 1,3-dioxolane bearing two wirepullings to drive two remote
Tomoyuki Amako1, Kazuki Nakabayashi, Nozomu Suzuki
1Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan. y-imai@apch.kindai.ac.jp.
This study reveals cryptochirality in a molecule with two pyrene units, undetectable in its ground state. The hidden chirality was observed using circularly polarized luminescence in its photoexcited state.
Area of Science:
- Photochemistry
- Supramolecular Chemistry
- Chiroptical Spectroscopy
Background:
- Molecules with pyrene moieties are widely studied for their photophysical properties.
- Cryptochirality, or hidden chirality, presents challenges in characterization due to its absence in the ground state.
Purpose of the Study:
- To investigate the presence and detection of cryptochirality in a novel 2,2-Dimethyl-1,3-dioxolane derivative linked to two pyrene units.
- To explore the utility of circularly polarized luminescence (CPL) in deciphering cryptochirality in photoexcited states.
Main Methods:
- Synthesis of a 2,2-Dimethyl-1,3-dioxolane molecule functionalized with two pyrene groups via flexible linkers.
- Chiroptical spectroscopy, including circular dichroism (CD) measurements in the ground state.
- Circularly polarized luminescence (CPL) spectroscopy of the photoexcited state in chloroform solution.
Main Results:
- The synthesized molecule exhibited no detectable circular dichroism signals in the ground state, indicating cryptochirality.
- Distinct circularly polarized luminescence signals were observed upon photoexcitation, confirming the presence of chirality in the excited state.
- The flexible linker played a crucial role in allowing the molecule to adopt a chiral conformation upon excitation.
Conclusions:
- The study successfully demonstrates the presence of cryptochirality in the investigated pyrene derivative.
- Circularly polarized luminescence is a powerful technique for detecting and characterizing hidden chirality in photoexcited states.
- This work expands the understanding of chiroptical properties in complex molecular architectures.
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