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Molecular Spring Constant Analysis by Biomembrane Force Probe Spectroscopy

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Published on: November 20, 2021

On the link between the reaction force constant and conceptual DFT.

Carlos Cárdenas^1,2, Paul W Ayers³, Debajit Chakraborty⁴

¹Departmento de Física, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Casilla 653, Santiago, Chile. cardena@uchile.cl.

Journal of Molecular Modeling

|September 14, 2024

Summary

This study links the reaction force constant to conceptual density functional theory (c-DFT) reactivity descriptors. Negative reaction force constants indicate electronic rearrangements, while positive ones signify geometric changes during reactions.

Keywords:

Conceptual DFT Nuclear softness Reactivity Rection force constant

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Area of Science:

Chemical Dynamics
Theoretical Chemistry
Computational Chemistry

Background:

The reaction force constant characterizes potential energy profile curvature along the intrinsic reaction coordinate.
It provides insights into reaction pathways and mechanisms.

Purpose of the Study:

To establish a novel link between the reaction force constant and conceptual density functional theory (c-DFT) reactivity descriptors.
To derive expressions relating the reaction force constant to nuclear softness and chemical potential variations.

Main Methods:

Density Functional Theory (DFT) calculations were employed.
The B3LYP exchange-correlation functional and 6-311++G(d,2p) basis set were utilized.
The internal reaction path for proton transfer in SNOH was computed.

Main Results:

A direct correlation was found between the reaction force constant and c-DFT reactivity descriptors.
Negative reaction force constant regions correspond to significant electronic structure rearrangements.
Positive reaction force constant regions are associated with geometric rearrangements.

Conclusions:

The study enhances the understanding of forces driving chemical reactions.
The findings offer new perspectives for analyzing reaction mechanisms by connecting the reaction force constant with c-DFT.
This work bridges macroscopic reaction pathway characterization with microscopic electronic properties.