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Emergent chiroptical properties in supramolecular and plasmonic assemblies
N S Shahana Nizar1, Meleppatt Sujith1, K Swathi1,2
1School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER TVM), Vithura, Thiruvananthapuram, 695 551, India. kgt@iisertvm.ac.in.
Chemical Society Reviews
|September 15, 2021
Summary
This tutorial explains chiroptical properties in supramolecular and plasmonic assemblies. It details how transition dipole coupling creates circular dichroism (CD) signals, crucial for chiral sensing applications.
Area of Science:
- Photophysical and Supramolecular Chemistry
- Plasmonics and Nanomaterials
Background:
- Chiroptical properties arise from the interaction of light with chiral molecules and assemblies.
- Understanding these properties is key to developing advanced optical materials.
Purpose of the Study:
- To provide a comprehensive overview of the origins of chiroptical properties in supramolecular and plasmonic systems.
- To explain the fundamental photophysical concepts governing chiroptical signatures in the UV-visible spectrum.
Main Methods:
- Discussion of photophysical concepts like oscillator and rotational strength.
- Explanation of induced circular dichroism (ICD) and exciton coupled circular dichroism (ECD) mechanisms.
- Overview of plasmonic chirality, including inherent, induced, and surface plasmon-coupled circular dichroism (SP-CD).
Main Results:
- Chiroptical signatures emerge from transition dipole coupling, with rotational strength defining their presence.
- ICD in supramolecular systems results from off-resonance coupling, while ECD arises from on-resonance exciton coupling.
- Plasmonic systems exhibit significantly larger oscillator strengths, leading to intense CD signals.
Conclusions:
- The sign of bisignated ECD spectra depends on assembly handedness and transition dipole interaction energy.
- Intense CD signals in plasmonic systems are valuable for designing chiral sensing platforms.
- This tutorial clarifies the origins of chiroptical properties for diverse applications.
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