Related Experiment Video
Updated: Jun 23, 2025
10:28
Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
Published on: May 27, 2018
8.8K
The Interplay between Tunneling and Parity Violation in Chiral Molecules
Daniel Martínez-Gil1,2, Pedro Bargueño2, Salvador Miret-Artés3
1Fundación Humanismo y Ciencia, Guzmán el Bueno, 66, 28015 Madrid, Spain.
Entropy (Basel, Switzerland)
|June 26, 2024
Summary
This review explores quantum tunneling and parity violation in chiral molecules, using a double well model. It discusses theoretical methods and experiments for detecting parity-violating energy differences (PVED) and resolving Hund's paradox.
Area of Science:
- Quantum Chemistry
- Molecular Physics
- Stereochemistry
Background:
- Chiral molecules exist as non-superimposable mirror images (enantiomers).
- Quantum tunneling allows interconversion between enantiomers (stereomutation).
- Parity violation introduces an energy difference between enantiomers (PVED).
Purpose of the Study:
- To review quantum tunneling and parity violation in chiral molecules.
- To discuss theoretical and experimental approaches for PVED detection.
- To explore solutions to Hund's paradox in chiral systems.
Main Methods:
- Double well potential model for chiral molecules.
- Theoretical calculations of parity-violating energy difference (PVED).
- Analysis of experimental detection methods for PVED.
Main Results:
- Quantum tunneling enables stereomutation dynamics in chiral molecules.
- Parity-violating interactions lead to a measurable PVED.
- Mean-field theory and decoherence are key to understanding Hund's paradox.
Conclusions:
- Quantum mechanics governs enantiomeric interconversion and energy differences.
- Accurate theoretical and experimental methods are crucial for PVED studies.
- Understanding decoherence is vital for resolving paradoxes in chiral molecular dynamics.
Related Concept Videos
02:30Chirality in Nature
13.3K
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
13.3K
02:25Chirality
23.9K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
23.9K
02:25Molecules with Multiple Chiral Centers
11.5K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
11.5K
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
5.7K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
5.7K
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
1.2K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.2K
02:33Stereoisomerism of Cyclic Compounds
8.8K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
8.8K