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Molecular Shapes

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
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Molecular Shape and Polarity

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Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.

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Related Experiment Video

Updated: May 13, 2026

Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Molecular shape sorting using molecular organic cages.

Tamoghna Mitra¹, Kim E Jelfs, Marc Schmidtmann

¹Department of Chemistry and Centre for Materials Discovery, University of Liverpool, Brownlow Hill, Liverpool, Merseyside L69 3BX, UK.

Nature Chemistry

|March 21, 2013

Summary

This summary is machine-generated.

Organic cages can now separate chemical feedstocks by size and shape, offering a sustainable solution. This molecular

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Area of Science:

Chemical Engineering
Materials Science
Supramolecular Chemistry

Background:

Energy-efficient separation of chemical feedstocks is crucial for sustainability.
Porous materials like zeolites and metal-organic frameworks are explored for separation.
Existing methods face challenges in specificity and energy consumption.

Purpose of the Study:

To investigate the potential of molecular organic cages for separating organic molecules.
To demonstrate size and shape-based separation using purely organic structures.
To achieve perfect specificity in separating structural isomers of aromatic feedstocks.

Main Methods:

Synthesis of a molecular organic cage from a mesitylene derivative.
Testing the cage's ability to separate mesitylene from 4-ethyltoluene.
Utilizing atomistic simulations and solid-state molecular dynamics for mechanistic understanding.

Main Results:

A molecular organic cage demonstrated unprecedented perfect specificity for separating 4-ethyltoluene from mesitylene.
The cage's intrinsic structure dictates the separation specificity.
This solid-state 'shape sorting' behavior was also observed in solution.

Conclusions:

Molecular organic cages offer a novel and highly specific approach to chemical feedstock separation.
This method presents a sustainable alternative to traditional porous frameworks.
The findings open new avenues for designing bespoke molecular separation agents.