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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 in Nature

Chirality in Nature

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.

Prochirality

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

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...

Measuring Reaction Rates

Measuring Reaction Rates

Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...

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...

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Non-Linear Optical Activity of Chiral Bipyrimidine-Based Thin Films.

Prescillia Nicolas¹, Stephania Abdallah², Ahmet Dok³

¹Institut des Sciences Chimiques de Rennes, CNRS-UMR 6226, Université de Rennes, Rennes, France.

Chemistry, an Asian Journal

|February 14, 2024

Summary

New chiral chromophores offer advanced nonlinear optical materials. Their self-assembly into organized thin films enables efficient second harmonic generation without complex processing.

Keywords:

Bipyrimidine Chirality Molecular organisation Nonlinear Optic Thin Films

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Area of Science:

Organic Chemistry
Materials Science
Nonlinear Optics

Background:

Development of novel chromophores for advanced optical applications is crucial.
Chiral organic molecules offer unique properties for nonlinear optics.
Tailoring molecular structure influences material performance.

Purpose of the Study:

To synthesize and characterize a new series of bipyrimidine-based chromophores.
To investigate the linear and nonlinear optical properties of these compounds.
To explore their thermal behavior and thin-film formation for optical applications.

Main Methods:

Synthesis of bipyrimidine-based chromophores with chiral side chains.
Spectroscopic analysis: one- and two-photon absorption, fluorescence.
Hyper-Rayleigh scattering for hyperpolarizability determination.
TD-DFT calculations for electronic and geometric properties.
Thermal analysis: optical microscopy, DSC, SAXS.
Nonlinear optical characterization: SHG and multiphoton fluorescence imaging.

Main Results:

Successfully synthesized bipyrimidine chromophores with chiral alkoxystyryl donors.
Determined linear and nonlinear optical properties, including first hyperpolarizabilities.
Investigated thermal properties, revealing melting or cold crystallization behavior.
Demonstrated formation of well-organized thin films without mesomorphism.
Confirmed strong second and third harmonic generation in non-centrosymmetric crystalline films.

Conclusions:

Chiral functionalization of 3D organic octupoles leads to non-centrosymmetric thin films.
This strategy enables development of highly second-order nonlinear optical active materials.
Materials can be processed into organized thin films without corona-poling or complex deposition.