Raman Optical Activity Spectroscopy in Chiral Systems
Summary
Raman optical activity (ROA) spectroscopy is a powerful chiroptical technique that distinguishes enantiomers by measuring subtle differences in Raman scattering under right and left circularly polarised light. By probing vibrational transitions, ROA provides detailed insights into three-dimensional molecular structure, conformational dynamics and local stereochemistry. In chiral systems ranging from small organic compounds to complex biomolecules, ROA can reveal secondary and tertiary folding motifs, hydrogen-bonding networks in aqueous environments and solvent-induced conformational equilibria. When operated under resonance conditions, in which the excitation wavelength overlaps an electronic transition, resonance Raman optical activity (RROA) further amplifies signals from chromophoric centres, enabling studies of excited-state properties and low-concentration samples. Complemented by quantum-chemical simulations using density functional theory and molecular-dynamics protocols, ROA has matured into a versatile tool across fields as diverse as drug development, protein folding, carbohydrate chemistry and materials science. Its sensitivity to subtle stereochemical variations positions ROA as a benchmark for quality control in pharmaceutical manufacture, for elucidation of biomolecular disorder linked to disease and for exploration of novel chiral materials in photonics.
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Raman Optical Activity Spectroscopy in Chiral Systems publication trend
The graph below shows the total number of articles in raman optical activity spectroscopy in chiral systems across all publications each year (not limited to Nature Index journals).
Technical terms
Chiral system: A chemical or molecular system in which structures cannot be superimposed on their mirror images, often leading to distinct optical behaviours.
Raman optical activity (ROA): A vibrational spectroscopy technique that measures the difference in intensity of Raman scattered light for right and left circularly polarised incident beams, sensitive to molecular chirality.
Resonance Raman optical activity (RROA): A variant of ROA in which the incident light is tuned to an electronic transition of the molecule, enhancing signals from specific chromophores and excited-state features.
Electronic circular dichroism (ECD): A spectroscopic method that records the differential absorption of right and left circularly polarised light in the ultraviolet to visible range, reporting on electronic transitions in chiral systems.
Density functional theory (DFT): A computational quantum mechanical approach used to model electronic structures and predict vibrational spectra, facilitating the interpretation of ROA measurements.
References
- Why Does One Measure Resonance Raman Optical Activity? A Unique Case of Measurements under Strong Resonance versus Far-from-Resonance Conditions. The Journal of Physical Chemistry Letters (2024).
- 'A careful disorderliness' in biomolecular structure revealed by Raman optical activity. Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy (2023).
- Recognition of the True and False Resonance Raman Optical Activity. Angewandte Chemie International Edition (2021).
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