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Properties of Enantiomers and Optical Activity

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...

Chirality

Chirality

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...

Chirality in Nature

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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.

Stereoisomerism

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

Molecules with Multiple Chiral Centers

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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...

Racemic Mixtures and the Resolution of Enantiomers

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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...

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Related Experiment Video

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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Chiral Light-Matter Interaction in Optical Resonators.

SeokJae Yoo¹, Q-Han Park¹

¹Department of Physics, Korea University, Seoul, 136-713, Korea.

Physical Review Letters

|June 6, 2015

Summary

This summary is machine-generated.

This study extends the Purcell effect to chiral molecules in optical resonators, revealing how to enhance chiroptical signals. The findings enable resonator-enhanced chiroptical spectroscopy for chiral molecules.

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Area of Science:

Quantum Optics
Chiroptical Spectroscopy
Nanophotonics

Background:

The Purcell effect modifies quantum emitter decay rates in optical cavities.
Cavity effects on chiral molecule decay rates are not well understood.
Chiroptical signals are crucial for molecular characterization.

Purpose of the Study:

To extend the Purcell effect to chiral light-matter interactions in optical resonators.
To define and analyze the chiral Purcell factor for enhancing chiroptical signals.
To propose a method for resonator-enhanced chiroptical spectroscopy.

Main Methods:

Theoretical extension of the Purcell effect to chiral systems.
Calculation of differential spontaneous decay rates for chiral molecules.
Definition of the chiral Purcell factor using quality factor and chiral mode volume.
Proposal of a double fishnet structure for resonator enhancement.

Main Results:

The chiral Purcell factor quantifies resonator ability to enhance chiroptical signals.
Quality factor and chiral mode volume determine the chiral Purcell factor.
Demonstrated applicability of the chiral Purcell effect to spectroscopy.
A realistic scheme for resonator-enhanced chiroptical spectroscopy was proposed.

Conclusions:

The chiral Purcell effect significantly modifies spontaneous decay rates of chiral molecules.
Optical resonators can be engineered to enhance chiroptical signals.
Resonator-enhanced chiroptical spectroscopy offers a powerful tool for molecular analysis.