Draft:Molecular-strain engineering

Background
In the field of chemistry, strain refers to the stress experienced by the chemical structure of a molecule, resulting in an increase in its internal energy compared to a reference compound without strain.

Precise control over molecular strain enables fine-tuning of mechanical, electrical, and optical characteristics, opening up possibilities for tailoring materials to specific applications and requirements.

Exploring molecular strain entails delving into the fundamental interactions and behaviors of molecules, deepening our understanding of molecular dynamics and contributing to scientific progress.

In conclusion, molecular-strain engineering represents a captivating and valuable area of research.

Molecule-Strain Engineering (MSE) is a promising approach that can be utilized in three main aspects:


 * 1) Modulation of assembly processes: MSE achieves this by precisely adjusting the conformations of building blocks through intramolecular strain.
 * 2) Manipulation of reaction progress and selectivities: MSE fine-tunes the energy diagram of a reaction through intramolecular strain, thereby influencing its progress and selectivity.
 * 3) Modulation of physical and chemical properties: MSE modifies the fundamental geometrical parameters of molecules, such as bond length and valence angle, resulting in changes in their physical and chemical properties.

Mechanisms
MSE aims to understand the mechanisms and principles behind how mechanical strain affects molecular behaviors and properties. It involves the following:


 * Control of supramolecular assembly processes:
 * Molecular-strain engineering of double-walled tetrahedra.
 * Tuning atropisomeric conversion in supramolecular structures.


 * Manipulation of reaction progress and selectivities through MSE:
 * Mechanical trapping of the phlorin intermediate.
 * Mechanical trapping and in situ derivatization of the porphodimethene intermediate.
 * Tunable force-directed bond cleavage strategy through MSE.


 * Modulation of physical and chemical properties of molecules through MSE:
 * Mechanically tuning spin crossover property within molecular knots.
 * Tuning photophysical properties by varying intramolecular strain.
 * Strain-induced enhancement in reactivity of molecules.