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Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.

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Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...

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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
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The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

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Thermodynamics, Kinetics, and Optical Properties of Rotaxane: A First-Principles Molecular Dynamics Study.

Gourhari Jana¹, Jose L Mendoza-Cortes¹

¹Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, United States.

The Journal of Physical Chemistry. A

|March 15, 2023

Summary

This study investigates rotaxane compounds using advanced quantum mechanics, revealing promising optical properties for potential use in solar energy applications.

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Area of Science:

Computational Chemistry
Materials Science
Supramolecular Chemistry

Background:

Mechanically interlocked compounds, specifically rotaxanes, are complex molecular architectures with tunable properties.
Understanding their dynamic behavior and interactions is crucial for designing advanced materials.

Purpose of the Study:

To investigate the structural, dynamic, and electronic properties of a specific rotaxane compound (2R-D-2PF6).
To assess the potential of rotaxanes as optical materials for applications like solar energy harvesting.

Main Methods:

Advanced quantum mechanical methods, including atom-centered density matrix propagation and ab initio molecular dynamics simulations.
Analysis of noncovalent interactions using reduced density gradient, density overlap region indicator, and Hirshfeld surface analysis.
Evaluation of optical properties via electronic dipole moment, polarizability, and hyperpolarizability calculations.

Main Results:

The rotaxane compound 2R-D-2PF6 exhibits stability across a wide temperature range.
Promising linear and nonlinear optical responses were observed, indicating potential as an optical material.
Time-dependent density-functional theory calculations revealed a broad UV-visible absorption band.

Conclusions:

The investigated rotaxane demonstrates significant potential as an optical material due to its favorable electronic and optical properties.
Its broad absorption spectrum suggests applicability in solar energy harvesting and related technologies.