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Molecular spectroscopy and chirality
Research Guide
What is Molecular spectroscopy and chirality?
Molecular spectroscopy and chirality is the study and use of spectroscopic observables—especially chiroptical signals such as circular dichroism—to detect, interpret, and assign the handedness and three-dimensional structure of chiral molecules and materials.
The literature on molecular spectroscopy and chirality spans 106,745 works in the provided dataset, reflecting a large and mature research area even though a 5-year growth rate is not available. A central methodological theme is the joint use of experiment and quantum-chemical simulation to interpret chiroptical spectra, exemplified by "Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields" (1994). Structural ground truth and stereochemical validation commonly rely on crystallographic chirality determination, including "On enantiomorph-polarity estimation" (1983) and large structural repositories such as "The Cambridge Structural Database: a quarter of a million crystal structures and rising" (2002), which reports a database size of more than a quarter of a million small-molecule crystal structures.
Research Sub-Topics
Vibrational Circular Dichroism Spectroscopy
This sub-topic develops ab initio methods for computing VCD spectra to determine absolute configurations of chiral molecules. Researchers apply density functional theory to vibrational force fields and solvent effects.
Electronic Circular Dichroism
This sub-topic focuses on UV-Vis CD spectra for protein secondary structure and chiral chromophore studies. Computational models integrate TD-DFT with exciton coupling for configurational analysis.
Chiroptical Raman Spectroscopy
This sub-topic investigates Raman optical activity (ROA) for aqueous biomolecule chirality without chromophores. Studies advance quantum mechanical simulations of vibrational Raman tensors.
Density Functional Theory for Chiral Spectra
This sub-topic optimizes DFT functionals and basis sets for accurate prediction of chiroptical properties. Benchmarks include natural bond orbital analysis for donor-acceptor chirality mechanisms.
Chiral Supramolecular Assemblies
This sub-topic examines self-assembled helical structures and their spectroscopic signatures from molecular chirality transfer. Research includes crystal databases and enantiopure polarity estimation.
Why It Matters
Molecular spectroscopy and chirality matters because many functional properties depend on handedness, and spectroscopy provides a route to identify and quantify that handedness in molecules, macromolecules, and materials. In practice, chiroptical spectroscopy is used to connect measured spectra to absolute configuration and conformational populations by comparison to computed spectra, an approach formalized for vibrational circular dichroism by Stephens, Devlin, Chabalowski, and Frisch in "Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields" (1994). Reliable stereochemical assignment is strengthened when spectroscopic conclusions are cross-checked against crystallographic enantiomorph determination; Flack’s "On enantiomorph-polarity estimation" (1983) provides a widely used framework for estimating enantiomorph polarity from diffraction intensities. For biomolecular structure–function questions, chirality-sensitive spectroscopy is routinely interpreted alongside secondary-structure assignments; Kabsch and Sander’s "Dictionary of protein secondary structure: Pattern recognition of hydrogen‐bonded and geometrical features" (1983) supplies a physically motivated definition of secondary structure that is frequently used to relate spectroscopic signatures to structural motifs. At scale, curated structural data enable benchmarking and validation of chiral assignments and computed observables; Allen’s "The Cambridge Structural Database: a quarter of a million crystal structures and rising" (2002) explicitly documents a small-molecule crystal-structure corpus exceeding a quarter million entries, supporting systematic method evaluation and stereochemical consistency checks.
Reading Guide
Where to Start
Start with Stephens, Devlin, Chabalowski, and Frisch’s "Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields" (1994) because it directly connects chiroptical observables (vibrational absorption and circular dichroism) to a practical quantum-chemical computation strategy that underpins many modern assignments.
Key Papers Explained
"Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields" (Stephens et al., 1994) provides a template for predicting chiroptical spectra from electronic-structure calculations. The reliability of those calculations depends on foundational quantum-chemistry components such as the correlated-wavefunction basis set in "Self-consistent molecular orbital methods. XX. A basis set for correlated wave functions" (Krishnan et al., 1980) and on robust implementations in software described in "The ORCA program system" (Neese, 2011) and "Chemistry with ADF" (te Velde et al., 2001). Interpretation and chemical rationalization of spectral differences can be supported by orbital-interaction viewpoints from "Intermolecular interactions from a natural bond orbital, donor-acceptor viewpoint" (Reed et al., 1988). Finally, stereochemical validation and reference data connect spectroscopy to structure via "On enantiomorph-polarity estimation" (Flack, 1983) and the curated structural corpus summarized in "The Cambridge Structural Database: a quarter of a million crystal structures and rising" (Allen, 2002).
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Advanced work increasingly emphasizes tighter closure between computed chiroptical spectra and independently validated absolute structure, pairing methods like those in Stephens et al. (1994) with crystallographic polarity/absolute-structure checks as treated by Flack (1983) and with broad structural benchmarking enabled by Allen (2002). On the computation side, expanding method coverage and reproducibility often relies on mature electronic-structure platforms described in "The ORCA program system" (2011) and "Chemistry with ADF" (2001), combined with careful basis-set and interaction-analysis choices grounded in Krishnan et al. (1980) and Reed et al. (1988).
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Ab Initio Calculation of Vibrational Absorption and Circular D... | 1994 | The Journal of Physica... | 22.4K | ✕ |
| 2 | Self-consistent molecular orbital methods. XX. A basis set for... | 1980 | The Journal of Chemica... | 17.0K | ✕ |
| 3 | Intermolecular interactions from a natural bond orbital, donor... | 1988 | Chemical Reviews | 17.0K | ✕ |
| 4 | Dictionary of protein secondary structure: Pattern recognition... | 1983 | Biopolymers | 15.5K | ✕ |
| 5 | Development and use of quantum mechanical molecular models. 76... | 1985 | Journal of the America... | 13.1K | ✕ |
| 6 | A New Two-Constant Equation of State | 1976 | Industrial & Engineeri... | 12.4K | ✕ |
| 7 | The ORCA program system | 2011 | Wiley Interdisciplinar... | 12.3K | ✕ |
| 8 | On enantiomorph-polarity estimation | 1983 | Acta Crystallographica... | 10.4K | ✕ |
| 9 | The Cambridge Structural Database: a quarter of a million crys... | 2002 | Acta Crystallographica... | 10.3K | ✕ |
| 10 | Chemistry with ADF | 2001 | Journal of Computation... | 9.9K | ✕ |
In the News
Enantio-selective vibronic coupling revealed via dissymmetry of upconverted emission in double-resonance excitation of chiral polymer
Double-resonance dual-beam spectroscopy, involving vibrational and electronic transitions, is a powerful tool allowing to resolve vibronic coupling in complex molecular systems. Here, introducing r...
Observation of Rayleigh optical activity for chiral molecules: a new chiroptical tool
We gratefully acknowledge support from the Simons Foundation and member institutions.
Centrosymmetric crystal displays chiral optical responses ...
Classy discovery
Propeller-shaped luminescent molecules can switch ...
The propeller-shaped perylene diimide (PDI) hexamers invert their helical twist (propeller chirality) depending on the solvent, leading to changes in both the sign and intensity of circularly polar...
Emerging chiral molecular carbon materials for ...
Emerging chiral molecular carbon materials for chiroptoelectronic applications X. Zhang, X. Ge, J. You, Y. Wang, Q. Huang and L. Wan, J. Mater. Chem. C, 2025, 13, 20444 DOI: 10.1039/D5TC0253...
Code & Tools
This directory contains the model architectures and experimental setups used for ChIRo, SchNet, DimeNet++, and SphereNet on the four tasks consider...
The Electronic Chirality Measure (ECM) is an end-to-end package implemented in Python 3.9 to measure the mentioned quantity. It also has some devel...
SPECTRE is a tool to compute optical properties of molecules in any homo- or heterogenous environment. ### License MIT license
## What is SpectroChemPy? SpectroChemPy (SCPy) is a framework for processing, analyzing and modeling Spectroscopic data for Chemistry with Python...
##### The official code for "Decoupled peak property learning for efficient and interpretable ECD spectra prediction" submitted to Nature Computati...
Recent Preprints
Circular dichroism articles from across Nature Portfolio
Circular dichroism is the difference in the absorption of left- and right-handed circularly polarized light that occurs when a molecule contains one or more chiral, light-absorbing groups. It is us...
Vibrational circular dichroism of tartaric acid in water
for the two conformational distributions, it is confirmed that the AM1-based MD simulations provide a better microscopic picture of TA2 in water. Introduction Vibrational circular dichroism (VCD) ...
Advances in chiral analysis: from classical methods to ...
Given the wide range of established and continuously emerging methods for the analysis of chiral molecules, the review is focused on the four most typical analytical techniques: (i) chromatography,...
Recent Progress on the Characterization of Polymer ...
AFM technology in addressing key issues in polymer crystallization, such as single-molecule force spectroscopy (SMFS) and atomic force microscopy–infrared spectroscopy (AFM-IR). As AFM technology a...
Raman spectroscopy - Latest research and news
Raman spectroscopy is an optical technique that detects intrinsic vibrational, rotational and other low-frequency modes in molecules upon inelastic scattering of monochromatic light. Because differ...
Latest Developments
Recent developments in molecular spectroscopy include Professor Anne B. McCoy's receipt of the 2026 Plyler Prize for impactful contributions to anharmonic vibrational spectroscopy and dynamics, particularly in hydrogen bonding and proton transfer processes (Washington University, published November 13, 2025). Additionally, advances in chiral analysis feature the development of cavity-enhanced chiral eigenmode (CECEM) spectroscopy, enabling high-resolution, simultaneous measurement of molecular chirality properties (phys.org, July 15, 2024). Significant progress in chiral research also includes the demonstration of attosecond control over chiral photoionization dynamics, revealing chiral electron behavior on ultrafast timescales (Nature, August 27, 2025), and near-complete chiral selection in rotational quantum states (Nature Communications, August 28, 2024). Furthermore, machine learning approaches such as ChiDeK are being developed to encode stereochemical information for complex chiral molecules (OpenReview, January 26, 2026).
Sources
Frequently Asked Questions
What is the core idea behind using circular dichroism in molecular spectroscopy to study chirality?
Circular dichroism is measured as a differential interaction of left- and right-handed circularly polarized light with a chiral sample, producing a signal that depends on molecular handedness and conformation. "Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields" (1994) established a practical route to interpret such signals by computing vibrational absorption and circular dichroism spectra from density-functional force fields.
How are computed chiroptical spectra typically generated for assigning absolute configuration?
A common workflow is to compute candidate spectra for plausible stereoisomers and conformers using quantum chemistry and then compare them to experiment for the best match. Stephens et al. (1994) showed that vibrational absorption and circular dichroism spectra can be calculated ab initio using density functional force fields in "Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields" (1994).
Which quantum-chemistry ingredients are most often referenced when building reliable chiroptical calculations?
Reliable chiroptical predictions depend on electronic-structure methods, basis sets, and analysis tools that control accuracy and interpretability. Krishnan, Binkley, Seeger, and Pople introduced a widely used contracted Gaussian basis set (6-311G**) in "Self-consistent molecular orbital methods. XX. A basis set for correlated wave functions" (1980), and Reed, Curtiss, and Weinhold provided an interaction analysis framework in "Intermolecular interactions from a natural bond orbital, donor-acceptor viewpoint" (1988) that is often used to rationalize spectral trends.
How do researchers validate spectroscopic chirality assignments against structural ground truth?
A standard validation route is to compare spectroscopic assignments to crystallographic determinations of absolute structure and enantiomorph polarity. Flack’s "On enantiomorph-polarity estimation" (1983) describes parameter-based estimation of enantiomorph polarity from diffraction intensities, and Allen’s "The Cambridge Structural Database: a quarter of a million crystal structures and rising" (2002) summarizes a curated resource containing more than a quarter of a million small-molecule crystal structures for cross-checking stereochemistry.
Which software platforms are commonly cited for practical electronic-structure calculations relevant to chiroptical spectroscopy?
General-purpose quantum-chemistry packages are frequently cited because they implement the electronic-structure methods used to compute chiroptical observables. Neese’s "The ORCA program system" (2011) and te Velde et al.’s "Chemistry with ADF" (2001) describe program systems that support a broad range of modern electronic-structure approaches used in spectroscopy-oriented modeling.
What is the current state of the field in terms of scale and maturity?
The provided dataset lists 106,745 works associated with molecular spectroscopy and chirality, indicating a large and established research area. Methodologically, the top-cited foundations in the provided list emphasize (i) ab initio prediction of chiroptical spectra (Stephens et al., 1994), (ii) robust electronic-structure infrastructure via basis sets and software (Krishnan et al., 1980; Neese, 2011; te Velde et al., 2001), and (iii) stereochemical validation through crystallography and databases (Flack, 1983; Allen, 2002).
Open Research Questions
- ? How can density-functional force-field approaches like those used in "Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields" (1994) be systematically benchmarked against large, diverse sets of experimentally validated chiral structures drawn from resources summarized in "The Cambridge Structural Database: a quarter of a million crystal structures and rising" (2002)?
- ? Which aspects of basis-set choice (e.g., the 6-311G** family introduced in "Self-consistent molecular orbital methods. XX. A basis set for correlated wave functions" (1980)) most strongly control errors in computed chiroptical intensities, and how can those dependencies be predicted a priori for new chemical classes?
- ? How can donor–acceptor interaction analyses from "Intermolecular interactions from a natural bond orbital, donor-acceptor viewpoint" (1988) be linked quantitatively to sign/intensity patterns in calculated circular dichroism spectra across conformational ensembles?
- ? What are the failure modes of enantiomorph-polarity estimation as treated in "On enantiomorph-polarity estimation" (1983) when used as ground truth for benchmarking spectroscopic chirality assignments, and how should uncertainty be propagated into spectroscopy–theory comparisons?
Recent Trends
The provided dataset indicates a large research base (106,745 works) but does not provide a 5-year growth rate, so trend claims must be qualitative rather than growth-quantified.
Within the provided paper set, recent practice is shaped by the availability of mature, general-purpose electronic-structure implementations—"The ORCA program system" and "Chemistry with ADF" (2001)—that make routine, end-to-end prediction of chiroptical observables more accessible.
2011At the same time, the field continues to emphasize traceability of chirality assignments to structural ground truth via crystallographic methods in "On enantiomorph-polarity estimation" and large-scale reference structure collections summarized in "The Cambridge Structural Database: a quarter of a million crystal structures and rising" (2002), which explicitly reports more than a quarter of a million small-molecule crystal structures.
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