Persistent Radicals
Persistent Radicals - Related Videos
14:22
Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development
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Cited by 9 •
2013
Radical-based biomimetic chemistry has been applied to building-up libraries necessary for biomarker development.
04:54
In Vitro Persister Assay: A Method to Evaluate the Effect of Osmolytes on Bacterial Persistence
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2025
In this video, we demonstrate a method to evaluate the effect of osmolytes on the formation of bacterial persisters. The bacterial cells are first exposed to osmolytes to induce osmotic stress, triggering persister formation, then treated with antibiotics to enumerate the persisters.
10:29
Photochemical Initiation Of Radical Polymerization Reactions
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2023
Source: David C. Powers, Tamara M. Powers, Texas A&M In this video, we will carry out the photochemically initiated polymerization of styrene to generate polystyrene, which is an important commodity plastic. We will learn the fundamentals of photochemistry and use simple photochemistry to initiate radical polymerization reactions. Specifically, in this module we will examine the photochemistry of benzoyl peroxide and its role as a photo-initiator of styrene polymerization reactions. In the...
01:02
Radical Reactivity: Electrophilic Radicals
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2023
Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a low‐energy SOMO, which interacts...
01:16
Radical Reactivity: Nucleophilic Radicals
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2023
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For instance, consider...
FAQs
Steric shielding places bulky groups around the radical center, making it harder for two radical molecules to approach and recombine. This protection reduces one of the rapid pathways that normally removes unpaired electrons. As a result, the radical can survive long enough for chemists to observe its behavior, investigate its reactions, or use it in controlled chemical systems.
Resonance delocalization spreads the unpaired electron over more of the molecular structure, while electron-withdrawing groups can reduce the tendency toward rapid radical reactions. These structural effects limit radical recombination and other fast processes. Comparing such features helps chemists connect molecular structure with persistence and predict which radical designs may remain detectable under laboratory conditions.
Short-lived radicals commonly undergo rapid reactions before researchers can examine them directly, whereas persistent radicals may remain detectable under ordinary laboratory conditions. This difference makes persistent species useful as practical probes of radical behavior. Their longer lifetimes allow chemists to study reaction mechanisms and assess how structural changes influence radical reactivity rather than observing only fleeting intermediates.
Electron paramagnetic resonance spectroscopy provides a way to study species containing unpaired electrons and to follow their role in reaction mechanisms. Because some persistent radicals remain detectable under ordinary laboratory conditions, they are especially suitable for this approach. The technique therefore connects an observable radical signal with questions about molecular structure, persistence, and chemical reactivity.
Persistent radicals can participate in strategies for controlling radical polymerization, a process in which radical reactions build polymer chains. Their relatively long lifetimes make them useful for influencing how radical activity is maintained or limited during the process. This application connects molecular radical stability with the preparation of polymeric materials whose formation depends on regulated radical chemistry.
Their unusual persistence gives chemists a stable radical platform for designing catalysts, spin labels, and functional materials. In these roles, the retained unpaired electron can support chemical or measurable properties that would be difficult to use with rapidly disappearing radicals. The same structural principles that extend radical lifetime therefore support applications across synthesis, materials science, and biological chemistry.