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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...

Isomerism

Isomerism

Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...

Stereoisomers

Stereoisomers

On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...

Stereoisomerism of Cyclic Compounds

Stereoisomerism of Cyclic Compounds

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,...

Molecules with Multiple Chiral Centers

Molecules with Multiple Chiral Centers

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...

Structural Isomerism

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...

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Related Experiment Video

Updated: Mar 25, 2026

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

White light emissive molecular siblings.

Samir Kumar Sarkar¹, George Rajendra Kumar¹, Pakkirisamy Thilagar¹

¹Inorganic and Physical Chemistry Department, Indian Institute of Science, Bangalore, India. thilagar@ipc.iisc.ernet.in.

Chemical Communications (Cambridge, England)

|February 25, 2016

Summary

This summary is machine-generated.

Researchers developed two boron-based molecules that emit complementary fluorescence. When mixed, these molecules produce white light by controlling energy transfer, offering new possibilities for lighting applications.

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Last Updated: Mar 25, 2026

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

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Published on: March 13, 2019

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Area of Science:

Materials Science
Organic Chemistry
Photophysics

Background:

Developing novel fluorescent materials is crucial for advanced optical applications.
Boron-based compounds offer unique electronic and photophysical properties.
Achieving white-light emission from molecular systems often requires complex strategies.

Purpose of the Study:

To design and synthesize structurally similar, complementary fluorescent boron-based molecular systems.
To investigate the modulation of luminescence properties through intramolecular energy transfer.
To demonstrate white-light emission from a binary mixture of these novel compounds.

Main Methods:

Synthesis of two boron-based molecular siblings (compounds 2 and 3).
Characterization of individual photoluminescence properties.
Analysis of intramolecular energy transfer mechanisms.
Evaluation of the emission spectrum of a binary mixture.

Main Results:

Successful synthesis of boron-based molecular siblings 2 and 3.
Demonstrated complementary fluorescence by controlling intramolecular energy transfer.
The binary mixture of compounds 2 and 3 successfully emitted white light.

Conclusions:

Structurally close boron-based molecules can be designed for complementary fluorescence.
Intramolecular energy transfer is a key factor in modulating luminescence for white-light emission.
This work presents a viable molecular approach for generating white-light using boron-based systems.