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Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

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[2 + 2] Cycloaddition Produces Divalent Organic Color-Centers with Reduced Heterogeneity in Single-Walled Carbon

Haoran Qu¹, Yulun Han², Jacob Fortner³

¹Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States.

Journal of the American Chemical Society

|August 5, 2024

Summary

Researchers developed a new method to create divalent organic color centers (OCCs) in single-walled carbon nanotubes (SWCNTs). This approach reduces emission heterogeneity, enabling more controlled photoluminescence for advanced applications.

Area of Science:

Materials Science
Nanotechnology
Organic Chemistry

Background:

Organic color centers (OCCs) in single-walled carbon nanotubes (SWCNTs) are crucial for sensing, bioimaging, and quantum technologies.
Monovalent OCCs exhibit heterogeneous photoluminescence due to multiple bonding configurations on the SWCNT lattice.
Controlling OCC emission is vital for reliable performance in various applications.

Purpose of the Study:

To develop a method for synthesizing divalent OCCs with reduced bonding configurations.
To investigate the photoluminescence properties of these divalent OCCs.
To explore temperature-dependent control over OCC emission heterogeneity.

Main Methods:

Synthesis of divalent OCCs via a heat-activated [2 + 2] cycloaddition reaction.
Utilizing enophile molecules (methylmaleimide, maleic anhydride, 4-cyclopentene-1,3-dione) with SWCNTs in ethylene glycol.
Employing density functional theory (DFT) calculations to assign bonding configurations.
Analyzing photoluminescence emission peaks and their temperature dependence.

Main Results:

Successful synthesis of divalent OCCs with a limited number of atomic bonding configurations.
Observation of only three distinct OCC emission peaks, assignable to specific divalent configurations.
Demonstration of temperature-controlled reduction in emission heterogeneity.
DFT calculations confirm the assignment of emission peaks to bonding configurations.

Conclusions:

Divalent OCC chemistry offers a scalable route to SWCNTs with controlled photoluminescence.
Reduced emission heterogeneity enhances the potential for precise applications in quantum technologies and sensing.
This approach paves the way for tailored OCCs with predictable optical properties.

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Cycloaddition Reactions: Overview

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.

Cycloaddition Reactions: MO Requirements for Thermal Activation

Cycloaddition Reactions: MO Requirements for Thermal Activation

Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...

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